{"id":131970,"date":"2020-07-06T23:03:48","date_gmt":"2020-07-06T15:03:48","guid":{"rendered":"http:\/\/4563.org\/?p=131970"},"modified":"2020-07-06T23:03:48","modified_gmt":"2020-07-06T15:03:48","slug":"scala%e8%af%ad%e8%a8%80%e5%ad%a6%e4%b9%a0%ef%bc%88%e4%b8%89%ef%bc%89%e3%80%81scala%e7%9a%84%e6%95%b0%e7%bb%84%e3%80%81map%e3%80%81%e5%85%83%e7%bb%84%e3%80%81%e9%9b%86%e5%90%88","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=131970","title":{"rendered":"scala\u8bed\u8a00\u5b66\u4e60\uff08\u4e09\uff09\u3001Scala\u7684\u6570\u7ec4\u3001Map\u3001\u5143\u7ec4\u3001\u96c6\u5408"},"content":{"rendered":"<h2><a href=\"https:\/\/www.studytime.xin\/article\/#\u6570\u7ec4\" title=\"\u6570\u7ec4\"><\/a>\u6570\u7ec4<\/h2>\n<p>scala\u4e2d\u6570\u7ec4\u7684\u6982\u5ff5\u662f\u548cJava\u7c7b\u4f3c\uff0c\u53ef\u4ee5\u7528\u6570\u7ec4\u6765\u5b58\u653e\u540c\u7c7b\u578b\u7684\u4e00\u7ec4\u6570\u636e\u3002<br \/>\u6570\u7ec4\u7c7b\u578b\u5206\u4e3a\u5b9a\u957f\u6570\u7ec4\u548c\u53d8\u957f\u6570\u7ec4\u4e24\u79cd\u3002<\/p>\n<h3><a href=\"https:\/\/www.studytime.xin\/article\/#\u5b9a\u957f\u6570\u7ec4\" title=\"\u5b9a\u957f\u6570\u7ec4\"><\/a>\u5b9a\u957f\u6570\u7ec4<\/h3>\n<p>\u5b9a\u957f\u6570\u7ec4\u6307\u7684\u662f\u6570\u7ec4\u7684<strong>\u957f\u5ea6<\/strong>\u662f<strong>\u4e0d\u5141\u8bb8\u6539\u53d8<\/strong>\u7684\uff0c\u4f46\u6570\u7ec4\u7684\u5143\u7d20\u662f\u53ef\u4ee5\u6539\u53d8\u7684\u3002<\/p>\n<h4><a href=\"https:\/\/www.studytime.xin\/article\/#\u8bed\u6cd5\" title=\"\u8bed\u6cd5\"><\/a>\u8bed\u6cd5<\/h4>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span>&#x2F;&#x2F; \u901a\u8fc7\u6307\u5b9a\u957f\u5ea6\u5b9a\u4e49\u6570\u7ec4<\/span><br><span>val&#x2F;var \u53d8\u91cf\u540d &#x3D; new Array[\u5143\u7d20\u7c7b\u578b](\u6570\u7ec4\u957f\u5ea6)<\/span><br><span><\/span><br><span>&#x2F;&#x2F; \u7528\u5143\u7d20\u76f4\u63a5\u521d\u59cb\u5316\u6570\u7ec4<\/span><br><span>val&#x2F;var \u53d8\u91cf\u540d &#x3D; Array(\u5143\u7d201, \u5143\u7d202, \u5143\u7d203...)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<p>\u7279\u6b8a\u8bf4\u660e\uff1a<\/p>\n<ul>\n<li>\u5728scala\u4e2d\uff0c\u6570\u7ec4\u7684\u6cdb\u578b\u4f7f\u7528[]\u6765\u6307\u5b9a<\/li>\n<li>\u4f7f\u7528()\u6765\u83b7\u53d6\u5143\u7d20<\/li>\n<\/ul>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><span>7<\/span><br><span>8<\/span><br><span>9<\/span><br><span>10<\/span><br><span>11<\/span><br><span>12<\/span><br><span>13<\/span><br><span>14<\/span><br><span>15<\/span><br><span>16<\/span><br><span>17<\/span><br><span>18<\/span><br><span>19<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span>scala&gt;  <span>val<\/span> a = <span>new<\/span> <span>Array<\/span>[<span>Int<\/span>](<span>10<\/span>)<\/span><br><span>a: <span>Array<\/span>[<span>Int<\/span>] = <span>Array<\/span>(<span>0<\/span>, <span>0<\/span>, <span>0<\/span>, <span>0<\/span>, <span>0<\/span>, <span>0<\/span>, <span>0<\/span>, <span>0<\/span>, <span>0<\/span>, <span>0<\/span>)<\/span><br><span><\/span><br><span>scala&gt;  a(<span>0<\/span>)<\/span><br><span>res91: <span>Int<\/span> = <span>0<\/span><\/span><br><span><\/span><br><span>scala&gt; a(<span>0<\/span>) = <span>10<\/span><\/span><br><span><\/span><br><span>scala&gt; a<\/span><br><span>res93: <span>Array<\/span>[<span>Int<\/span>] = <span>Array<\/span>(<span>10<\/span>, <span>0<\/span>, <span>0<\/span>, <span>0<\/span>, <span>0<\/span>, <span>0<\/span>, <span>0<\/span>, <span>0<\/span>, <span>0<\/span>, <span>0<\/span>)<\/span><br><span><\/span><br><span>scala&gt;  <span>val<\/span> b = <span>Array<\/span>(<span>\"hadoop\"<\/span>, <span>\"spark\"<\/span>, <span>\"hive\"<\/span>)<\/span><br><span>b: <span>Array<\/span>[<span>String<\/span>] = <span>Array<\/span>(hadoop, spark, hive)<\/span><br><span><\/span><br><span>scala&gt; b(<span>0<\/span>)<\/span><br><span>res94: <span>String<\/span> = hadoop<\/span><br><span><\/span><br><span>scala&gt; b.length<\/span><br><span>res95: <span>Int<\/span> = <span>3<\/span><\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h3><a href=\"https:\/\/www.studytime.xin\/article\/#\u53d8\u957f\u6570\u7ec4\" title=\"\u53d8\u957f\u6570\u7ec4\"><\/a>\u53d8\u957f\u6570\u7ec4<\/h3>\n<p>\u53d8\u957f\u6570\u7ec4\u6307\u7684\u662f\u6570\u7ec4\u7684\u957f\u5ea6\u662f\u53ef\u53d8\u7684\uff0c\u53ef\u4ee5\u5f80\u6570\u7ec4\u4e2d\u6dfb\u52a0\u3001\u5220\u9664\u5143\u7d20\u3002<\/p>\n<h4><a href=\"https:\/\/www.studytime.xin\/article\/#\u521b\u5efa\u53d8\u957f\u6570\u7ec4\uff0c\u9700\u8981\u63d0\u524d\u5bfc\u5165ArrayBuffer\u7c7b\" title=\"\u521b\u5efa\u53d8\u957f\u6570\u7ec4\uff0c\u9700\u8981\u63d0\u524d\u5bfc\u5165ArrayBuffer\u7c7b\"><\/a>\u521b\u5efa\u53d8\u957f\u6570\u7ec4\uff0c\u9700\u8981\u63d0\u524d\u5bfc\u5165ArrayBuffer\u7c7b<\/h4>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>import<\/span> scala.collection.mutable.<span>ArrayBuffer<\/span><\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h4><a href=\"https:\/\/www.studytime.xin\/article\/#\u8bed\u6cd5-1\" title=\"\u8bed\u6cd5\"><\/a>\u8bed\u6cd5<\/h4>\n<p>\u521b\u5efa\u7a7a\u7684ArrayBuffer\u53d8\u957f\u6570\u7ec4<\/p>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>val<\/span>\/<span>var<\/span> a = <span>ArrayBuffer<\/span>[\u5143\u7d20\u7c7b\u578b]()<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<p>\u521b\u5efa\u5e26\u6709\u521d\u59cb\u5143\u7d20\u7684ArrayBuffer<\/p>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>val<\/span>\/<span>var<\/span> a = <span>ArrayBuffer<\/span>(\u5143\u7d20<span>1<\/span>\uff0c\u5143\u7d20<span>2<\/span>\uff0c\u5143\u7d20<span>3.<\/span>...)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h4><a href=\"https:\/\/www.studytime.xin\/article\/#\u6f14\u793a\" title=\"\u6f14\u793a\"><\/a>\u6f14\u793a<\/h4>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><span>7<\/span><br><span>8<\/span><br><span>9<\/span><br><span>10<\/span><br><span>11<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>\/\/\u5bfc\u5165ArrayBuffer\u7c7b\u578b<\/span><\/span><br><span>scala&gt; <span>import<\/span> scala.collection.mutable.<span>ArrayBuffer<\/span><\/span><br><span><span>import<\/span> scala.collection.mutable.<span>ArrayBuffer<\/span><\/span><br><span><\/span><br><span><span>\/\/\u5b9a\u4e49\u4e00\u4e2a\u957f\u5ea6\u4e3a0\u7684\u6574\u578b\u53d8\u957f\u6570\u7ec4<\/span><\/span><br><span>scala&gt; <span>val<\/span> a = <span>ArrayBuffer<\/span>[<span>Int<\/span>]()<\/span><br><span>a: scala.collection.mutable.<span>ArrayBuffer<\/span>[<span>Int<\/span>] = <span>ArrayBuffer<\/span>()<\/span><br><span><\/span><br><span><span>\/\/\u5b9a\u4e49\u4e00\u4e2a\u6709\u521d\u59cb\u5143\u7d20\u7684\u53d8\u957f\u6570\u7ec4<\/span><\/span><br><span>scala&gt; <span>val<\/span> b = <span>ArrayBuffer<\/span>(<span>\"hadoop\"<\/span>, <span>\"storm\"<\/span>, <span>\"spark\"<\/span>)<\/span><br><span>b: scala.collection.mutable.<span>ArrayBuffer<\/span>[<span>String<\/span>] = <span>ArrayBuffer<\/span>(hadoop, storm, spark)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h4><a href=\"https:\/\/www.studytime.xin\/article\/#\u53d8\u957f\u6570\u7ec4\u7684\u589e\u5220\u6539\u64cd\u4f5c\" title=\"\u53d8\u957f\u6570\u7ec4\u7684\u589e\u5220\u6539\u64cd\u4f5c\"><\/a>\u53d8\u957f\u6570\u7ec4\u7684\u589e\u5220\u6539\u64cd\u4f5c<\/h4>\n<ul>\n<li>\u4f7f\u7528<code>+=<\/code>\u6dfb\u52a0\u5143\u7d20<\/li>\n<li>\u4f7f\u7528<code>-=<\/code>\u5220\u9664\u5143\u7d20<\/li>\n<li>\u4f7f\u7528<code>++=<\/code>\u8ffd\u52a0\u4e00\u4e2a\u6570\u7ec4\u5230\u53d8\u957f\u6570\u7ec4<\/li>\n<\/ul>\n<h5><a href=\"https:\/\/www.studytime.xin\/article\/#\u793a\u4f8b\" title=\"\u793a\u4f8b\"><\/a>\u793a\u4f8b<\/h5>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><span>7<\/span><br><span>8<\/span><br><span>9<\/span><br><span>10<\/span><br><span>11<\/span><br><span>12<\/span><br><span>13<\/span><br><span>14<\/span><br><span>15<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>\/\/ \u5b9a\u4e49\u53d8\u957f\u6570\u7ec4<\/span><\/span><br><span>scala&gt; <span>val<\/span> a = <span>ArrayBuffer<\/span>(<span>\"hadoop\"<\/span>, <span>\"spark\"<\/span>, <span>\"flink\"<\/span>)<\/span><br><span>a: scala.collection.mutable.<span>ArrayBuffer<\/span>[<span>String<\/span>] = <span>ArrayBuffer<\/span>(hadoop, spark, flink)<\/span><br><span><\/span><br><span><span>\/\/ \u8ffd\u52a0\u4e00\u4e2a\u5143\u7d20<\/span><\/span><br><span>scala&gt; a += <span>\"flume\"<\/span><\/span><br><span>res10: a<span>.<span>type<\/span> <\/span>= <span>ArrayBuffer<\/span>(hadoop, spark, flink, flume)<\/span><br><span><\/span><br><span><span>\/\/ \u5220\u9664\u4e00\u4e2a\u5143\u7d20<\/span><\/span><br><span>scala&gt; a -= <span>\"hadoop\"<\/span><\/span><br><span>res11: a<span>.<span>type<\/span> <\/span>= <span>ArrayBuffer<\/span>(spark, flink, flume)<\/span><br><span><\/span><br><span><span>\/\/ \u8ffd\u52a0\u4e00\u4e2a\u6570\u7ec4<\/span><\/span><br><span>scala&gt; a ++= <span>Array<\/span>(<span>\"hive\"<\/span>, <span>\"sqoop\"<\/span>)<\/span><br><span>res12: a<span>.<span>type<\/span> <\/span>= <span>ArrayBuffer<\/span>(spark, flink, flume, hive, sqoop)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h4><a href=\"https:\/\/www.studytime.xin\/article\/#\u904d\u5386\u6570\u7ec4\" title=\"\u904d\u5386\u6570\u7ec4\"><\/a>\u904d\u5386\u6570\u7ec4<\/h4>\n<p>\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4e24\u79cd\u65b9\u5f0f\u6765\u904d\u5386\u6570\u7ec4\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528for\u8868\u8fbe\u5f0f \u76f4\u63a5\u904d\u5386\u6570\u7ec4\u4e2d\u7684\u5143\u7d20<\/li>\n<li>\u4f7f\u7528 \u7d22\u5f15 \u83b7\u5f97\u6570\u7ec4\u4e2d\u7684\u5143\u7d20<\/li>\n<\/ul>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><span>7<\/span><br><span>8<\/span><br><span>9<\/span><br><span>10<\/span><br><span>11<\/span><br><span>12<\/span><br><span>13<\/span><br><span>14<\/span><br><span>15<\/span><br><span>16<\/span><br><span>17<\/span><br><span>18<\/span><br><span>19<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span>scala&gt; <span>for<\/span>(i &lt;- a) println(i)<\/span><br><span>hadoop<\/span><br><span>hive<\/span><br><span>flume<\/span><br><span>spark<\/span><br><span><\/span><br><span><span>\/\/0 to n    \u2014\u2014\u5305\u542b0\uff0c\u4e5f\u5305\u542bn<\/span><\/span><br><span>scala&gt; <span>for<\/span>(i &lt;- <span>0<\/span> to a.length <span>-1<\/span> ) println(a(i))<\/span><br><span>hadoop<\/span><br><span>hive<\/span><br><span>flume<\/span><br><span>spark<\/span><br><span><\/span><br><span><span>\/\/0 until n \u2014\u2014\u751f\u6210\u4e00\u7cfb\u5217\u7684\u6570\u5b57\uff0c\u5305\u542b0\uff0c\u4e0d\u5305\u542bn<\/span><\/span><br><span>scala&gt; <span>for<\/span>(i &lt;- <span>0<\/span> until a.length) println(a(i))<\/span><br><span>hadoop<\/span><br><span>hive<\/span><br><span>flume<\/span><br><span>spark<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h4><a href=\"https:\/\/www.studytime.xin\/article\/#\u6570\u7ec4\u5e38\u7528\u64cd\u4f5c\" title=\"\u6570\u7ec4\u5e38\u7528\u64cd\u4f5c\"><\/a>\u6570\u7ec4\u5e38\u7528\u64cd\u4f5c<\/h4>\n<p>scala\u4e2d\u7684\u6570\u7ec4\u5c01\u88c5\u4e86\u4e30\u5bcc\u7684\u8ba1\u7b97\u64cd\u4f5c\uff0c\u5c06\u6765\u5728\u5bf9\u6570\u636e\u5904\u7406\u7684\u65f6\u5019\uff0c\u4e0d\u9700\u8981\u6211\u4eec\u81ea\u5df1\u518d\u91cd\u65b0\u5b9e\u73b0\u3002<\/p>\n<ul>\n<li>\u6c42\u548c\u2014\u2014sum\u65b9\u6cd5<\/li>\n<li>\u6c42\u6700\u5927\u503c\u2014\u2014max\u65b9\u6cd5 <\/li>\n<li>\u6c42\u6700\u5c0f\u503c\u2014\u2014min\u65b9\u6cd5 <\/li>\n<li>\u6392\u5e8f\u2014\u2014sorted\u65b9\u6cd5<\/li>\n<\/ul>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><span>7<\/span><br><span>8<\/span><br><span>9<\/span><br><span>10<\/span><br><span>11<\/span><br><span>12<\/span><br><span>13<\/span><br><span>14<\/span><br><span>15<\/span><br><span>16<\/span><br><span>17<\/span><br><span>18<\/span><br><span>19<\/span><br><span>20<\/span><br><span>21<\/span><br><span>22<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span>scala&gt; <span>val<\/span> array = <span>Array<\/span>(<span>1<\/span>,<span>3<\/span>,<span>4<\/span>,<span>2<\/span>,<span>5<\/span>)<\/span><br><span>array: <span>Array<\/span>[<span>Int<\/span>] = <span>Array<\/span>(<span>1<\/span>, <span>3<\/span>, <span>4<\/span>, <span>2<\/span>, <span>5<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u6c42\u548c<\/span><\/span><br><span>scala&gt; array.sum<\/span><br><span>res10: <span>Int<\/span> = <span>15<\/span><\/span><br><span><\/span><br><span><span>\/\/\u6c42\u6700\u5927\u503c<\/span><\/span><br><span>scala&gt; array.max<\/span><br><span>res11: <span>Int<\/span> = <span>5<\/span><\/span><br><span><\/span><br><span><span>\/\/\u6c42\u6700\u5c0f\u503c<\/span><\/span><br><span>scala&gt; array.min<\/span><br><span>res12: <span>Int<\/span> = <span>1<\/span><\/span><br><span><\/span><br><span><span>\/\/\u5347\u5e8f sorted\u539f\u6570\u7ec4\u4e0d\u53d8\uff0c\u751f\u6210\u4e00\u4e2a\u65b0\u7684\u6392\u8fc7\u5e8f\u7684\u6570\u7ec4<\/span><\/span><br><span>scala&gt; array.sorted<\/span><br><span>res13: <span>Array<\/span>[<span>Int<\/span>] = <span>Array<\/span>(<span>1<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>, <span>5<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u964d\u5e8f    reverse \u53cd\u8f6c<\/span><\/span><br><span>scala&gt; array.sorted.reverse<\/span><br><span>res14: <span>Array<\/span>[<span>Int<\/span>] = <span>Array<\/span>(<span>5<\/span>, <span>4<\/span>, <span>3<\/span>, <span>2<\/span>, <span>1<\/span>)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h2><a href=\"https:\/\/www.studytime.xin\/article\/#\u5143\u7ec4\" title=\"\u5143\u7ec4\"><\/a>\u5143\u7ec4<\/h2>\n<p>\u5143\u7ec4\u53ef\u4ee5\u7528\u6765\u5305\u542b\u4e00\u7ec4==\u4e0d\u540c\u7c7b\u578b==\u7684\u503c\u3002\u4f8b\u5982\uff1a\u59d3\u540d\uff0c\u5e74\u9f84\uff0c\u6027\u522b\uff0c\u51fa\u751f\u5e74\u6708\u3002\u5143\u7ec4\u7684\u5143\u7d20\u662f==\u4e0d\u53ef\u53d8== \u7684\u3002<\/p>\n<h3><a href=\"https:\/\/www.studytime.xin\/article\/#\u5b9a\u4e49\u5143\u7ec4\" title=\"\u5b9a\u4e49\u5143\u7ec4\"><\/a>\u5b9a\u4e49\u5143\u7ec4<\/h3>\n<p>\u4f7f\u7528\u62ec\u53f7\u6765\u5b9a\u4e49\u5143\u7ec4<\/p>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>val<\/span>\/<span>var<\/span> \u5143\u7ec4\u53d8\u91cf\u540d\u79f0 = (\u5143\u7d20<span>1<\/span>, \u5143\u7d20<span>2<\/span>, \u5143\u7d20<span>3.<\/span>...)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<p>\u4f7f\u7528\u7bad\u5934\u6765\u5b9a\u4e49\u5143\u7d20\uff08\u5143\u7ec4\u53ea\u6709\u4e24\u4e2a\u5143\u7d20\uff09<\/p>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>val<\/span>\/<span>var<\/span> \u5143\u7ec4 = \u5143\u7d20<span>1<\/span> -&gt; \u5143\u7d20<span>2<\/span><\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h3><a href=\"https:\/\/www.studytime.xin\/article\/#\u793a\u4f8b-1\" title=\"\u793a\u4f8b\"><\/a>\u793a\u4f8b<\/h3>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><span>7<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>\/\/ \u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u62ec\u53f7\u6765\u5b9a\u4e49\u4e00\u4e2a\u5143\u7ec4<\/span><\/span><br><span>scala&gt; <span>val<\/span> a = (<span>1<\/span>, <span>\"\u5f20\u4e09\"<\/span>, <span>20<\/span>, <span>\"\u5317\u4eac\u5e02\"<\/span>) <\/span><br><span>a: (<span>Int<\/span>, <span>String<\/span>, <span>Int<\/span>, <span>String<\/span>) = (<span>1<\/span>,\u5f20\u4e09,<span>20<\/span>,\u5317\u4eac\u5e02)<\/span><br><span><\/span><br><span><span>\/\/\u4f7f\u7528\u7bad\u5934\u6765\u5b9a\u4e49\u5143\u7d20<\/span><\/span><br><span>scala&gt; <span>val<\/span> b = <span>1<\/span> -&gt; <span>2<\/span> <\/span><br><span>b: (<span>Int<\/span>, <span>Int<\/span>) = (<span>1<\/span>,<span>2<\/span>)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h3><a href=\"https:\/\/www.studytime.xin\/article\/#\u8bbf\u95ee\u5143\u7ec4\" title=\"\u8bbf\u95ee\u5143\u7ec4\"><\/a>\u8bbf\u95ee\u5143\u7ec4<\/h3>\n<ul>\n<li>\u4f7f\u7528 <code>_1\u3001_2\u3001_3....<\/code>\u6765\u8bbf\u95ee\u5143\u7ec4\u4e2d\u7684\u5143\u7d20<\/li>\n<li>\u5143\u7ec4\u7684index\u4ece1\u5f00\u59cb\uff0c_1\u8868\u793a\u8bbf\u95ee\u7b2c\u4e00\u4e2a\u5143\u7d20\uff0c\u4f9d\u6b21\u7c7b\u63a8<\/li>\n<\/ul>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><span>7<\/span><br><span>8<\/span><br><span>9<\/span><br><span>10<\/span><br><span>11<\/span><br><span>12<\/span><br><span>13<\/span><br><span>14<\/span><br><span>15<\/span><br><span>16<\/span><br><span>17<\/span><br><span>18<\/span><br><span>19<\/span><br><span>20<\/span><br><span>21<\/span><br><span>22<\/span><br><span>23<\/span><br><span>24<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span>scala&gt; <span>val<\/span> a = (<span>1<\/span>, <span>\"\u5f20\u4e09\"<\/span>, <span>20<\/span>, <span>\"\u5317\u4eac\u5e02\"<\/span>)<\/span><br><span>a: (<span>Int<\/span>, <span>String<\/span>, <span>Int<\/span>, <span>String<\/span>) = (<span>1<\/span>,\u5f20\u4e09,<span>20<\/span>,\u5317\u4eac\u5e02)<\/span><br><span><\/span><br><span><span>\/\/\u83b7\u53d6\u5143\u7ec4\u4e2d\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20<\/span><\/span><br><span>scala&gt; a._1<\/span><br><span>res18: <span>Int<\/span> = <span>1<\/span><\/span><br><span><\/span><br><span><span>\/\/\u83b7\u53d6\u5143\u7ec4\u4e2d\u7684\u7b2c\u4e8c\u4e2a\u5143\u7d20<\/span><\/span><br><span>scala&gt; a._2<\/span><br><span>res19: <span>String<\/span> = \u5f20\u4e09<\/span><br><span><\/span><br><span><span>\/\/\u83b7\u53d6\u5143\u7ec4\u4e2d\u7684\u7b2c\u4e09\u4e2a\u5143\u7d20<\/span><\/span><br><span>scala&gt; a._3<\/span><br><span>res20: <span>Int<\/span> = <span>20<\/span><\/span><br><span><\/span><br><span><span>\/\/\u83b7\u53d6\u5143\u7ec4\u4e2d\u7684\u7b2c\u56db\u4e2a\u5143\u7d20<\/span><\/span><br><span>scala&gt; a._4<\/span><br><span>res21: <span>String<\/span> = \u5317\u4eac\u5e02<\/span><br><span><\/span><br><span><span>\/\/\u4e0d\u80fd\u4fee\u6539\u5143\u7ec4\u4e2d\u7684\u503c<\/span><\/span><br><span>scala&gt; a._4 = <span>\"\u4e0a\u6d77\"<\/span><\/span><br><span>&lt;console&gt;:<span>12<\/span>: error: reassignment to <span>val<\/span><\/span><br><span>       a._4=<span>\"\u4e0a\u6d77\"<\/span><\/span><br><span>           ^<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h2><a href=\"https:\/\/www.studytime.xin\/article\/#\u6620\u5c04Map\" title=\"\u6620\u5c04Map\"><\/a>\u6620\u5c04Map<\/h2>\n<p>Map\u53ef\u4ee5\u79f0\u4e4b\u4e3a\u6620\u5c04\u3002\u5b83\u662f\u7531\u952e\u503c\u5bf9\u7ec4\u6210\u7684\u96c6\u5408\u3002scala\u5f53\u4e2d\u7684Map\u96c6\u5408\u4e0ejava\u5f53\u4e2d\u7684Map\u7c7b\u4f3c\uff0c\u4e5f\u662fkey\uff0cvalue\u5bf9\u5f62\u5f0f\u7684\u3002<br \/>\u5728scala\u4e2d\uff0cMap\u4e5f\u5206\u4e3a\u4e0d\u53ef\u53d8Map\u548c\u53ef\u53d8 Map\u3002<\/p>\n<h3><a href=\"https:\/\/www.studytime.xin\/article\/#\u4e0d\u53ef\u53d8Map\" title=\"\u4e0d\u53ef\u53d8Map\"><\/a>\u4e0d\u53ef\u53d8Map<\/h3>\n<h4><a href=\"https:\/\/www.studytime.xin\/article\/#\u5b9a\u4e49\u8bed\u6cd5\" title=\"\u5b9a\u4e49\u8bed\u6cd5\"><\/a>\u5b9a\u4e49\u8bed\u6cd5<\/h4>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>val<\/span>\/<span>var<\/span> map = <span>Map<\/span>(\u952e-&gt;\u503c, \u952e-&gt;\u503c, \u952e-&gt;\u503c...)    <span>\/\/ \u63a8\u8350\u8fd9\u79cd\u5199\u6cd5\uff0c\u53ef\u8bfb\u6027\u66f4\u597d <\/span><\/span><br><span><span>val<\/span>\/<span>var<\/span> map = <span>Map<\/span>((\u952e, \u503c), (\u952e, \u503c), (\u952e, \u503c), (\u952e, \u503c)...)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h4><a href=\"https:\/\/www.studytime.xin\/article\/#\u6f14\u793a-1\" title=\"\u6f14\u793a\"><\/a>\u6f14\u793a<\/h4>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><span>7<\/span><br><span>8<\/span><br><span>9<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span>scala&gt; <span>val<\/span> map1 = <span>Map<\/span>(<span>\"zhangsan\"<\/span>-&gt;<span>30<\/span>, <span>\"lisi\"<\/span>-&gt;<span>40<\/span>) <\/span><br><span>map: scala.collection.immutable.<span>Map<\/span>[<span>String<\/span>,<span>Int<\/span>] = <span>Map<\/span>(zhangsan -&gt; <span>30<\/span>, lisi -&gt; <span>40<\/span>)<\/span><br><span><\/span><br><span>scala&gt; <span>val<\/span> map2 = <span>Map<\/span>((<span>\"zhangsan\"<\/span>, <span>30<\/span>), (<span>\"lisi\"<\/span>, <span>30<\/span>)) <\/span><br><span>map: scala.collection.immutable.<span>Map<\/span>[<span>String<\/span>,<span>Int<\/span>] = <span>Map<\/span>(zhangsan -&gt; <span>30<\/span>, lisi -&gt; <span>30<\/span>)<\/span><br><span><\/span><br><span><span>\/\/ \u6839\u636ekey\u83b7\u53d6value <\/span><\/span><br><span>scala&gt; map1(<span>\"zhangsan\"<\/span>) <\/span><br><span>res10: <span>Int<\/span> = <span>30<\/span><\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h3><a href=\"https:\/\/www.studytime.xin\/article\/#\u53ef\u53d8Map\" title=\"\u53ef\u53d8Map\"><\/a>\u53ef\u53d8Map<\/h3>\n<p>\u53ef\u53d8Map\u9700\u8981\u624b\u52a8\u5bfc\u5165==import scala.collection.mutable.Map==, \u5b9a\u4e49\u8bed\u6cd5\u4e0e\u4e0d\u53ef\u53d8Map\u4e00\u81f4\u3002<\/p>\n<h4><a href=\"https:\/\/www.studytime.xin\/article\/#\u6f14\u793a-2\" title=\"\u6f14\u793a\"><\/a>\u6f14\u793a<\/h4>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><span>7<\/span><br><span>8<\/span><br><span>9<\/span><br><span>10<\/span><br><span>11<\/span><br><span>12<\/span><br><span>13<\/span><br><span>14<\/span><br><span>15<\/span><br><span>16<\/span><br><span>17<\/span><br><span>18<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>\/\/\u5bfc\u5305<\/span><\/span><br><span>scala&gt; <span>import<\/span> scala.collection.mutable.<span>Map<\/span><\/span><br><span><span>import<\/span> scala.collection.mutable.<span>Map<\/span><\/span><br><span><\/span><br><span><span>\/\/\u5b9a\u4e49\u53ef\u53d8\u7684map<\/span><\/span><br><span>scala&gt; <span>val<\/span> map3 = <span>Map<\/span>(<span>\"zhangsan\"<\/span>-&gt;<span>30<\/span>, <span>\"lisi\"<\/span>-&gt;<span>40<\/span>)<\/span><br><span>map3: scala.collection.mutable.<span>Map<\/span>[<span>String<\/span>,<span>Int<\/span>] = <span>Map<\/span>(lisi -&gt; <span>40<\/span>, zhangsan -&gt; <span>30<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u83b7\u53d6zhangsan\u8fd9\u4e2akey\u5bf9\u5e94\u7684value<\/span><\/span><br><span>scala&gt; map3(<span>\"zhangsan\"<\/span>)<\/span><br><span>res26: <span>Int<\/span> = <span>30<\/span><\/span><br><span><\/span><br><span><span>\/\/\u7ed9zhangsan\u8fd9\u4e2akey\u91cd\u65b0\u8d4b\u503cvalue<\/span><\/span><br><span>scala&gt; map3(<span>\"zhangsan\"<\/span>) = <span>50<\/span><\/span><br><span><\/span><br><span><span>\/\/\u663e\u793amap3<\/span><\/span><br><span>scala&gt; map3<\/span><br><span>res28: scala.collection.mutable.<span>Map<\/span>[<span>String<\/span>,<span>Int<\/span>] = <span>Map<\/span>(lisi -&gt; <span>40<\/span>, zhangsan -&gt; <span>50<\/span>)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h3><a href=\"https:\/\/www.studytime.xin\/article\/#Map\u57fa\u672c\u64cd\u4f5c\" title=\"Map\u57fa\u672c\u64cd\u4f5c\"><\/a>Map\u57fa\u672c\u64cd\u4f5c<\/h3>\n<p>\u521b\u5efa\u4e00\u4e2a\u53ef\u53d8\u7684map<\/p>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>\/\/\u5bfc\u5305<\/span><\/span><br><span>scala&gt; <span>import<\/span> scala.collection.mutable.<span>Map<\/span><\/span><br><span><span>import<\/span> scala.collection.mutable.<span>Map<\/span><\/span><br><span><\/span><br><span>scala&gt; <span>val<\/span> map = <span>Map<\/span>(<span>\"zhangsan\"<\/span>-&gt;<span>30<\/span>, <span>\"lisi\"<\/span>-&gt;<span>40<\/span>) <\/span><br><span>map: scala.collection.mutable.<span>Map<\/span>[<span>String<\/span>,<span>Int<\/span>] = <span>Map<\/span>(lisi -&gt; <span>40<\/span>, zhangsan -&gt; <span>30<\/span>)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<ul>\n<li>\u6309\u7167key\u83b7\u53d6value<\/li>\n<\/ul>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><span>7<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>\/\/ \u83b7\u53d6zhagnsan\u7684\u5e74\u9f84 <\/span><\/span><br><span>scala&gt; map(<span>\"zhangsan\"<\/span>)<\/span><br><span>res10: <span>Int<\/span> = <span>30<\/span><\/span><br><span><\/span><br><span><span>\/\/ \u83b7\u53d6wangwu\u7684\u5e74\u9f84\uff0c\u5982\u679cwangwu\u4e0d\u5b58\u5728\uff0c\u5219\u8fd4\u56de-1 \u6bd4\u8f83\u53cb\u597d\uff0c\u907f\u514d\u9047\u5230\u4e0d\u5b58\u5728\u7684key\u800c\u62a5\u9519<\/span><\/span><br><span>scala&gt; map.getOrElse(<span>\"wangwu\"<\/span>, <span>-1<\/span>) <\/span><br><span>res11: <span>Int<\/span> = <span>-1<\/span><\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<ul>\n<li>\u4fee\u6539key\u5bf9\u5e94\u7684value<\/li>\n<\/ul>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span>scala&gt; map(<span>\"lisi\"<\/span>) = <span>50<\/span><\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<ul>\n<li>\u6dfb\u52a0key-value\u952e\u503c\u5bf9<\/li>\n<\/ul>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span>scala&gt; map += (<span>\"wangwu\"<\/span> -&gt;<span>35<\/span>)<\/span><br><span>res12: map<span>.<span>type<\/span> <\/span>= <span>Map<\/span>(lisi -&gt; <span>50<\/span>, zhangsan -&gt; <span>30<\/span>, wangwu -&gt; <span>35<\/span>)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<ul>\n<li>\u5220\u9664key-value\u952e\u503c\u5bf9<\/li>\n<\/ul>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span>scala&gt; map -= <span>\"wangwu\"<\/span><\/span><br><span>res13: map<span>.<span>type<\/span> <\/span>= <span>Map<\/span>(lisi -&gt; <span>50<\/span>, zhangsan -&gt; <span>30<\/span>)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<ul>\n<li>\u83b7\u53d6\u6240\u6709\u7684key\u548c\u6240\u6709\u7684value<\/li>\n<\/ul>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><span>7<\/span><br><span>8<\/span><br><span>9<\/span><br><span>10<\/span><br><span>11<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>\/\/\u83b7\u53d6\u6240\u6709\u7684key<\/span><\/span><br><span>scala&gt; map.keys<\/span><br><span>res36: <span>Iterable<\/span>[<span>String<\/span>] = <span>Set<\/span>(lisi, zhangsan)<\/span><br><span><\/span><br><span><span>\/\/\u83b7\u53d6\u6240\u6709\u7684key<\/span><\/span><br><span>scala&gt; map.keySet<\/span><br><span>res37: scala.collection.<span>Set<\/span>[<span>String<\/span>] = <span>Set<\/span>(lisi, zhangsan)<\/span><br><span><\/span><br><span><span>\/\/\u83b7\u53d6\u6240\u6709\u7684value<\/span><\/span><br><span>scala&gt; map.values<\/span><br><span>res38: <span>Iterable<\/span>[<span>Int<\/span>] = <span>HashMap<\/span>(<span>50<\/span>, <span>30<\/span>)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<ul>\n<li>\u904d\u5386map<\/li>\n<\/ul>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><span>7<\/span><br><span>8<\/span><br><span>9<\/span><br><span>10<\/span><br><span>11<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>\/\/\u7b2c\u4e00\u79cd\u904d\u5386<\/span><\/span><br><span>scala&gt; <span>for<\/span>(k &lt;- map.keys) println(k + <span>\" -&gt; \"<\/span> + map(k))<\/span><br><span>lisi -&gt; <span>50<\/span><\/span><br><span>zhangsan -&gt; <span>30<\/span><\/span><br><span><\/span><br><span>scala&gt; <span>for<\/span>(kv &lt;- map3) println(kv._1 + <span>\"-&gt;\"<\/span> + kv._2)<\/span><br><span><\/span><br><span><span>\/\/\u7b2c\u4e8c\u79cd\u904d\u5386<\/span><\/span><br><span>scala&gt; <span>for<\/span>((k, v) &lt;- map) println(k + <span>\" -&gt; \"<\/span> + v)<\/span><br><span>lisi -&gt; <span>50<\/span><\/span><br><span>zhangsan -&gt; <span>30<\/span><\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h2><a href=\"https:\/\/www.studytime.xin\/article\/#Set\u96c6\u5408\" title=\"Set\u96c6\u5408\"><\/a>Set\u96c6\u5408<\/h2>\n<p>Set\u662f\u4ee3\u8868\u6ca1\u6709\u91cd\u590d\u5143\u7d20\u7684\u96c6\u5408\u3002<br \/>Set\u5177\u5907\u4ee5\u4e0b\u6027\u8d28\uff1a<\/p>\n<ul>\n<li>1\u3001\u5143\u7d20\u4e0d\u91cd\u590d <\/li>\n<li>2\u3001\u4e0d\u4fdd\u8bc1\u63d2\u5165\u987a\u5e8f<\/li>\n<\/ul>\n<p>scala\u4e2d\u7684set\u96c6\u5408\u4e5f\u5206\u4e3a\u4e24\u79cd\uff0c\u4e00\u79cd\u662f\u4e0d\u53ef\u53d8\u96c6\u5408\uff0c\u53e6\u4e00\u79cd\u662f\u53ef\u53d8\u96c6\u5408\u3002<\/p>\n<h3><a href=\"https:\/\/www.studytime.xin\/article\/#\u4e0d\u53ef\u53d8Set\u96c6\u5408\" title=\"\u4e0d\u53ef\u53d8Set\u96c6\u5408\"><\/a>\u4e0d\u53ef\u53d8Set\u96c6\u5408<\/h3>\n<h4><a href=\"https:\/\/www.studytime.xin\/article\/#\u8bed\u6cd5-2\" title=\"\u8bed\u6cd5\"><\/a>\u8bed\u6cd5<\/h4>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>\/\/\u521b\u5efa\u4e00\u4e2a\u7a7a\u7684\u4e0d\u53ef\u53d8\u96c6<\/span><\/span><br><span><span>val<\/span>\/<span>var<\/span> \u53d8\u91cf\u540d = <span>Set<\/span>[\u7c7b\u578b]()<\/span><br><span><\/span><br><span><span>\/\/\u7ed9\u5b9a\u5143\u7d20\u6765\u521b\u5efa\u4e00\u4e2a\u4e0d\u53ef\u53d8\u96c6<\/span><\/span><br><span><span>val<\/span>\/<span>var<\/span> \u53d8\u91cf\u540d = <span>Set<\/span>[\u7c7b\u578b](\u5143\u7d20<span>1<\/span>, \u5143\u7d20<span>2<\/span>, \u5143\u7d20<span>3.<\/span>..)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h4><a href=\"https:\/\/www.studytime.xin\/article\/#\u6f14\u793a-3\" title=\"\u6f14\u793a\"><\/a>\u6f14\u793a<\/h4>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><span>7<\/span><br><span>8<\/span><br><span>9<\/span><br><span>10<\/span><br><span>11<\/span><br><span>12<\/span><br><span>13<\/span><br><span>14<\/span><br><span>15<\/span><br><span>16<\/span><br><span>17<\/span><br><span>18<\/span><br><span>19<\/span><br><span>20<\/span><br><span>21<\/span><br><span>22<\/span><br><span>23<\/span><br><span>24<\/span><br><span>25<\/span><br><span>26<\/span><br><span>27<\/span><br><span>28<\/span><br><span>29<\/span><br><span>30<\/span><br><span>31<\/span><br><span>32<\/span><br><span>33<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>\/\/ \u521b\u5efaset\u96c6\u5408 <\/span><\/span><br><span>scala&gt; <span>val<\/span> a = <span>Set<\/span>(<span>1<\/span>, <span>1<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>, <span>5<\/span>) <\/span><br><span>a: scala.collection.immutable.<span>Set<\/span>[<span>Int<\/span>] = <span>Set<\/span>(<span>5<\/span>, <span>1<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>)<\/span><br><span><\/span><br><span><span>\/\/ \u83b7\u53d6\u96c6\u5408\u7684\u5927\u5c0f <\/span><\/span><br><span>scala&gt; a.size <\/span><br><span>res0: <span>Int<\/span> = <span>5<\/span><\/span><br><span><\/span><br><span><span>\/\/ \u904d\u5386\u96c6\u5408<\/span><\/span><br><span>scala&gt; <span>for<\/span>(i &lt;- a) println(i)<\/span><br><span><\/span><br><span><span>\/\/\u6dfb\u52a0\u5143\u7d20\u751f\u6210\u65b0\u7684\u96c6\u5408<\/span><\/span><br><span>scala&gt; a + <span>6<\/span><\/span><br><span>res1: scala.collection.immutable.<span>Set<\/span>[<span>Int<\/span>] = <span>Set<\/span>(<span>5<\/span>, <span>1<\/span>, <span>6<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>)<\/span><br><span><\/span><br><span><span>\/\/ \u5220\u9664\u4e00\u4e2a\u5143\u7d20 <\/span><\/span><br><span>scala&gt; a - <span>1<\/span> <\/span><br><span>res2: scala.collection.immutable.<span>Set<\/span>[<span>Int<\/span>] = <span>Set<\/span>(<span>5<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>)<\/span><br><span><\/span><br><span><span>\/\/ \u5220\u9664set\u96c6\u5408\u4e2d\u5b58\u5728\u7684\u5143\u7d20 <\/span><\/span><br><span>scala&gt; a -- <span>Set<\/span>(<span>2<\/span>,<span>3<\/span>) <\/span><br><span>res3: scala.collection.immutable.<span>Set<\/span>[<span>Int<\/span>] = <span>Set<\/span>(<span>5<\/span>, <span>1<\/span>, <span>4<\/span>)<\/span><br><span><\/span><br><span><span>\/\/ \u62fc\u63a5\u4e24\u4e2a\u96c6\u5408 <\/span><\/span><br><span>scala&gt; a ++ <span>Set<\/span>(<span>6<\/span>,<span>7<\/span>,<span>8<\/span>) <\/span><br><span>res4: scala.collection.immutable.<span>Set<\/span>[<span>Int<\/span>] = <span>Set<\/span>(<span>5<\/span>, <span>1<\/span>, <span>6<\/span>, <span>2<\/span>, <span>7<\/span>, <span>3<\/span>, <span>8<\/span>, <span>4<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u6c422\u4e2aSet\u96c6\u5408\u7684\u4ea4\u96c6<\/span><\/span><br><span>scala&gt; a &amp; <span>Set<\/span>(<span>3<\/span>,<span>4<\/span>,<span>5<\/span>,<span>6<\/span>)<\/span><br><span>res5: scala.collection.immutable.<span>Set<\/span>[<span>Int<\/span>] = <span>Set<\/span>(<span>5<\/span>, <span>3<\/span>, <span>4<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u6ce8\u610f\uff1a\u8fd9\u91cc\u5bf9\u4e0d\u53ef\u53d8\u7684set\u96c6\u5408\u8fdb\u884c\u6dfb\u52a0\u5220\u9664\u7b49\u64cd\u4f5c\uff0c\u5bf9\u4e8e\u8be5\u96c6\u5408\u6765\u8bf4\u662f\u6ca1\u6709\u53d1\u751f\u4efb\u4f55\u53d8\u5316\uff0c\u8fd9\u91cc\u662f\u751f\u6210\u4e86\u65b0\u7684\u96c6\u5408\uff0c\u65b0\u7684\u96c6\u5408\u76f8\u6bd4\u4e8e\u539f\u6765\u7684\u96c6\u5408\u6765\u8bf4\u53d1\u751f\u4e86\u53d8\u5316\u3002<\/span><\/span><br><span>scala&gt; a<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h3><a href=\"https:\/\/www.studytime.xin\/article\/#\u53ef\u53d8Set\u96c6\u5408\" title=\"\u53ef\u53d8Set\u96c6\u5408\"><\/a>\u53ef\u53d8Set\u96c6\u5408<\/h3>\n<p>\u8981\u4f7f\u7528\u53ef\u53d8\u96c6\uff0c\u5fc5\u987b\u8981\u624b\u52a8\u5bfc\u5165\uff1a ==import scala.collection.mutable.Set==<\/p>\n<h4><a href=\"https:\/\/www.studytime.xin\/article\/#\u6f14\u793a-4\" title=\"\u6f14\u793a\"><\/a>\u6f14\u793a<\/h4>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><span>7<\/span><br><span>8<\/span><br><span>9<\/span><br><span>10<\/span><br><span>11<\/span><br><span>12<\/span><br><span>13<\/span><br><span>14<\/span><br><span>15<\/span><br><span>16<\/span><br><span>17<\/span><br><span>18<\/span><br><span>19<\/span><br><span>20<\/span><br><span>21<\/span><br><span>22<\/span><br><span>23<\/span><br><span>24<\/span><br><span>25<\/span><br><span>26<\/span><br><span>27<\/span><br><span>28<\/span><br><span>29<\/span><br><span>30<\/span><br><span>31<\/span><br><span>32<\/span><br><span>33<\/span><br><span>34<\/span><br><span>35<\/span><br><span>36<\/span><br><span>37<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>\/\/\u5bfc\u5305<\/span><\/span><br><span>scala&gt; <span>import<\/span> scala.collection.mutable.<span>Set<\/span><\/span><br><span><span>import<\/span> scala.collection.mutable.<span>Set<\/span><\/span><br><span><\/span><br><span><span>\/\/\u5b9a\u4e49\u53ef\u53d8\u7684set\u96c6\u5408<\/span><\/span><br><span>scala&gt; <span>val<\/span> set = <span>Set<\/span>(<span>1<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>, <span>5<\/span>)<\/span><br><span>set: scala.collection.mutable.<span>Set<\/span>[<span>Int<\/span>] = <span>Set<\/span>(<span>1<\/span>, <span>5<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u6dfb\u52a0\u5355\u4e2a\u5143\u7d20<\/span><\/span><br><span>scala&gt; set += <span>6<\/span><\/span><br><span>res10: set<span>.<span>type<\/span> <\/span>= <span>Set<\/span>(<span>1<\/span>, <span>5<\/span>, <span>2<\/span>, <span>6<\/span>, <span>3<\/span>, <span>4<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u6dfb\u52a0\u591a\u4e2a\u5143\u7d20<\/span><\/span><br><span>scala&gt; set += (<span>6<\/span>, <span>7<\/span>, <span>8<\/span>, <span>9<\/span>)<\/span><br><span>res11: set<span>.<span>type<\/span> <\/span>= <span>Set<\/span>(<span>9<\/span>, <span>1<\/span>, <span>5<\/span>, <span>2<\/span>, <span>6<\/span>, <span>3<\/span>, <span>7<\/span>, <span>4<\/span>, <span>8<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u6dfb\u52a0\u4e00\u4e2aset\u96c6\u5408\u4e2d\u7684\u5143\u7d20<\/span><\/span><br><span>scala&gt; set ++= <span>Set<\/span>(<span>10<\/span>, <span>11<\/span>)<\/span><br><span>res12: set<span>.<span>type<\/span> <\/span>= <span>Set<\/span>(<span>9<\/span>, <span>1<\/span>, <span>5<\/span>, <span>2<\/span>, <span>6<\/span>, <span>3<\/span>, <span>10<\/span>, <span>7<\/span>, <span>4<\/span>, <span>11<\/span>, <span>8<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u5220\u9664\u4e00\u4e2a\u5143\u7d20<\/span><\/span><br><span>scala&gt; set -= <span>11<\/span><\/span><br><span>res13: set<span>.<span>type<\/span> <\/span>= <span>Set<\/span>(<span>9<\/span>, <span>1<\/span>, <span>5<\/span>, <span>2<\/span>, <span>6<\/span>, <span>3<\/span>, <span>10<\/span>, <span>7<\/span>, <span>4<\/span>, <span>8<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u5220\u9664\u591a\u4e2a\u5143\u7d20<\/span><\/span><br><span>scala&gt; set -= (<span>9<\/span>, <span>10<\/span>)<\/span><br><span>res15: set<span>.<span>type<\/span> <\/span>= <span>Set<\/span>(<span>1<\/span>, <span>5<\/span>, <span>2<\/span>, <span>6<\/span>, <span>3<\/span>, <span>7<\/span>, <span>4<\/span>, <span>8<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u5220\u9664\u4e00\u4e2aset\u5b50\u96c6<\/span><\/span><br><span>scala&gt; set --= <span>Set<\/span>(<span>7<\/span>, <span>8<\/span>)<\/span><br><span>res19: set<span>.<span>type<\/span> <\/span>= <span>Set<\/span>(<span>1<\/span>,<span>5<\/span>, <span>2<\/span>, <span>6<\/span>, <span>3<\/span>, <span>4<\/span>)<\/span><br><span><\/span><br><span>scala&gt; set.remove(<span>1<\/span>)<\/span><br><span>res17: <span>Boolean<\/span> = <span>true<\/span><\/span><br><span><\/span><br><span>scala&gt; set<\/span><br><span>res18: scala.collection.mutable.<span>Set<\/span>[<span>Int<\/span>] = <span>Set<\/span>(<span>5<\/span>, <span>2<\/span>, <span>6<\/span>, <span>3<\/span>, <span>4<\/span>)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h2><a href=\"https:\/\/www.studytime.xin\/article\/#\u5217\u8868-List\" title=\"\u5217\u8868 List\"><\/a>\u5217\u8868 List<\/h2>\n<p>List\u662fscala\u4e2d\u6700\u91cd\u8981\u7684\u3001\u4e5f\u662f\u6700\u5e38\u7528\u7684\u6570\u636e\u7ed3\u6784\u3002<\/p>\n<p>List\u5177\u5907\u4ee5\u4e0b\u6027\u8d28\uff1a<\/p>\n<ul>\n<li>1\u3001\u53ef\u4ee5\u4fdd\u5b58\u91cd\u590d\u7684\u503c <\/li>\n<li>2\u3001\u6709\u5148\u540e\u987a\u5e8f<\/li>\n<\/ul>\n<p>\u5728scala\u4e2d\uff0c\u4e5f\u6709\u4e24\u79cd\u5217\u8868\uff0c\u4e00\u79cd\u662f\u4e0d\u53ef\u53d8\u5217\u8868\u3001\u53e6\u4e00\u79cd\u662f\u53ef\u53d8\u5217\u8868<\/p>\n<h3><a href=\"https:\/\/www.studytime.xin\/article\/#\u4e0d\u53ef\u53d8\u5217\u8868\" title=\"\u4e0d\u53ef\u53d8\u5217\u8868\"><\/a>\u4e0d\u53ef\u53d8\u5217\u8868<\/h3>\n<p>\u4e0d\u53ef\u53d8\u5217\u8868\u5c31\u662f\u5217\u8868\u7684\u5143\u7d20\u3001\u957f\u5ea6\u90fd\u662f\u4e0d\u53ef\u53d8\u7684<\/p>\n<h4><a href=\"https:\/\/www.studytime.xin\/article\/#\u8bed\u6cd5-3\" title=\"\u8bed\u6cd5\"><\/a>\u8bed\u6cd5<\/h4>\n<p>\u4f7f\u7528 List(\u5143\u7d201, \u5143\u7d202, \u5143\u7d203, \u2026) \u6765\u521b\u5efa\u4e00\u4e2a\u4e0d\u53ef\u53d8\u5217\u8868\uff0c\u8bed\u6cd5\u683c\u5f0f<\/p>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><span>7<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>val<\/span>\/<span>var<\/span> \u53d8\u91cf\u540d = <span>List<\/span>(\u5143\u7d20<span>1<\/span>, \u5143\u7d20<span>2<\/span>, \u5143\u7d20<span>3.<\/span>..)<\/span><br><span><\/span><br><span><span>\/\/\u4f7f\u7528 Nil \u521b\u5efa\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7684\u7a7a\u5217\u8868<\/span><\/span><br><span><span>val<\/span>\/<span>var<\/span> \u53d8\u91cf\u540d = <span>Nil<\/span><\/span><br><span><\/span><br><span><span>\/\/\u4f7f\u7528 :: \u65b9\u6cd5\u521b\u5efa\u4e00\u4e2a\u4e0d\u53ef\u53d8\u5217\u8868<\/span><\/span><br><span><span>val<\/span>\/<span>var<\/span> \u53d8\u91cf\u540d = \u5143\u7d20<span>1<\/span> :: \u5143\u7d20<span>2<\/span> :: <span>Nil<\/span><\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h4><a href=\"https:\/\/www.studytime.xin\/article\/#\u6f14\u793a-5\" title=\"\u6f14\u793a\"><\/a>\u6f14\u793a<\/h4>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><span>7<\/span><br><span>8<\/span><br><span>9<\/span><br><span>10<\/span><br><span>11<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>\/\/\u521b\u5efa\u4e00\u4e2a\u4e0d\u53ef\u53d8\u5217\u8868\uff0c\u5b58\u653e\u4ee5\u4e0b\u51e0\u4e2a\u5143\u7d20\uff081,2,3,4\uff09<\/span><\/span><br><span>scala&gt; <span>val<\/span> list1 = <span>List<\/span>(<span>1<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>)<\/span><br><span>list1: <span>List<\/span>[<span>Int<\/span>] = <span>List<\/span>(<span>1<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u4f7f\u7528Nil\u521b\u5efa\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7684\u7a7a\u5217\u8868<\/span><\/span><br><span>scala&gt; <span>val<\/span> list2 = <span>Nil<\/span><\/span><br><span>list2: scala.collection.immutable.<span>Nil<\/span><span>.<span>type<\/span> <\/span>= <span>List<\/span>()<\/span><br><span><\/span><br><span><span>\/\/\u4f7f\u7528 :: \u65b9\u6cd5\u521b\u5efa\u5217\u8868\uff0c\u5305\u542b1\u30012\u30013\u4e09\u4e2a\u5143\u7d20<\/span><\/span><br><span>scala&gt; <span>val<\/span> list3= <span>1<\/span>::<span>2<\/span>::<span>3<\/span>::<span>Nil<\/span><\/span><br><span>list3: <span>List<\/span>[<span>Int<\/span>] = <span>List<\/span>(<span>1<\/span>, <span>2<\/span>, <span>3<\/span>)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h3><a href=\"https:\/\/www.studytime.xin\/article\/#\u53ef\u53d8\u5217\u8868\" title=\"\u53ef\u53d8\u5217\u8868\"><\/a>\u53ef\u53d8\u5217\u8868<\/h3>\n<ul>\n<li>\u53ef\u53d8\u5217\u8868\u5c31\u662f\u5217\u8868\u7684\u5143\u7d20\u3001\u957f\u5ea6\u90fd\u662f\u53ef\u53d8\u7684\u3002<\/li>\n<li>\u8981\u4f7f\u7528\u53ef\u53d8\u5217\u8868\uff0c\u5148\u8981\u5bfc\u5165 ==import scala.collection.mutable.ListBuffer==<\/li>\n<\/ul>\n<h4><a href=\"https:\/\/www.studytime.xin\/article\/#\u8bed\u6cd5-4\" title=\"\u8bed\u6cd5\"><\/a>\u8bed\u6cd5<\/h4>\n<p>\u4f7f\u7528ListBuffer<a href=\"\">\u5143\u7d20\u7c7b\u578b<\/a> \u521b\u5efa\u7a7a\u7684\u53ef\u53d8\u5217\u8868\uff0c\u8bed\u6cd5\u7ed3\u6784<\/p>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>val<\/span>\/<span>var<\/span> \u53d8\u91cf\u540d = <span>ListBuffer<\/span>[<span>Int<\/span>]()<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<ul>\n<li>\u4f7f\u7528ListBuffer(\u5143\u7d201, \u5143\u7d202, \u5143\u7d203\u2026)\u521b\u5efa\u53ef\u53d8\u5217\u8868\uff0c\u8bed\u6cd5\u7ed3\u6784<\/li>\n<\/ul>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>val<\/span>\/<span>var<\/span> \u53d8\u91cf\u540d = <span>ListBuffer<\/span>(\u5143\u7d20<span>1<\/span>\uff0c\u5143\u7d20<span>2<\/span>\uff0c\u5143\u7d20<span>3.<\/span>..)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h4><a href=\"https:\/\/www.studytime.xin\/article\/#\u6f14\u793a-6\" title=\"\u6f14\u793a\"><\/a>\u6f14\u793a<\/h4>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><span>7<\/span><br><span>8<\/span><br><span>9<\/span><br><span>10<\/span><br><span>11<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>\/\/\u5bfc\u5305<\/span><\/span><br><span>scala&gt; <span>import<\/span> scala.collection.mutable.<span>ListBuffer<\/span><\/span><br><span><span>import<\/span> scala.collection.mutable.<span>ListBuffer<\/span><\/span><br><span><\/span><br><span><span>\/\/\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u7684\u53ef\u53d8\u5217\u8868<\/span><\/span><br><span>scala&gt; <span>val<\/span> a = <span>ListBuffer<\/span>[<span>Int<\/span>]()<\/span><br><span>a: scala.collection.mutable.<span>ListBuffer<\/span>[<span>Int<\/span>] = <span>ListBuffer<\/span>()<\/span><br><span><\/span><br><span><span>\/\/\u5b9a\u4e49\u4e00\u4e2a\u6709\u521d\u59cb\u5143\u7d20\u7684\u53ef\u53d8\u5217\u8868<\/span><\/span><br><span>scala&gt; <span>val<\/span> b = <span>ListBuffer<\/span>(<span>1<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>)<\/span><br><span>b: scala.collection.mutable.<span>ListBuffer<\/span>[<span>Int<\/span>] = <span>ListBuffer<\/span>(<span>1<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<h3><a href=\"https:\/\/www.studytime.xin\/article\/#\u5217\u8868\u64cd\u4f5c\" title=\"\u5217\u8868\u64cd\u4f5c\"><\/a>\u5217\u8868\u64cd\u4f5c<\/h3>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><span>4<\/span><br><span>5<\/span><br><span>6<\/span><br><span>7<\/span><br><span>8<\/span><br><span>9<\/span><br><span>10<\/span><br><span>11<\/span><br><span>12<\/span><br><span>13<\/span><br><span>14<\/span><br><span>15<\/span><br><span>16<\/span><br><span>17<\/span><br><span>18<\/span><br><span>19<\/span><br><span>20<\/span><br><span>21<\/span><br><span>22<\/span><br><span>23<\/span><br><span>24<\/span><br><span>25<\/span><br><span>26<\/span><br><span>27<\/span><br><span>28<\/span><br><span>29<\/span><br><span>30<\/span><br><span>31<\/span><br><span>32<\/span><br><span>33<\/span><br><span>34<\/span><br><span>35<\/span><br><span>36<\/span><br><span>37<\/span><br><span>38<\/span><br><span>39<\/span><br><span>40<\/span><br><span>41<\/span><br><span>42<\/span><br><span>43<\/span><br><span>44<\/span><br><span>45<\/span><br><span>46<\/span><br><span>47<\/span><br><span>48<\/span><br><span>49<\/span><br><span>50<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span><span>\/\/\u5bfc\u5305<\/span><\/span><br><span>scala&gt; <span>import<\/span> scala.collection.mutable.<span>ListBuffer<\/span><\/span><br><span><span>import<\/span> scala.collection.mutable.<span>ListBuffer<\/span><\/span><br><span><\/span><br><span><span>\/\/\u5b9a\u4e49\u4e00\u4e2a\u53ef\u53d8\u7684\u5217\u8868<\/span><\/span><br><span>scala&gt; <span>val<\/span> list = <span>ListBuffer<\/span>(<span>1<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>)<\/span><br><span>list: scala.collection.mutable.<span>ListBuffer<\/span>[<span>Int<\/span>] = <span>ListBuffer<\/span>(<span>1<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u83b7\u53d6\u7b2c\u4e00\u4e2a\u5143\u7d20<\/span><\/span><br><span>scala&gt; list(<span>0<\/span>)<\/span><br><span>res4: <span>Int<\/span> = <span>1<\/span><\/span><br><span><span>\/\/\u83b7\u53d6\u7b2c\u4e00\u4e2a\u5143\u7d20<\/span><\/span><br><span>scala&gt; list.head<\/span><br><span>res5: <span>Int<\/span> = <span>1<\/span><\/span><br><span><\/span><br><span><span>\/\/\u83b7\u53d6\u9664\u4e86\u7b2c\u4e00\u4e2a\u5143\u7d20\u5916\u5176\u4ed6\u5143\u7d20\u7ec4\u6210\u7684\u5217\u8868<\/span><\/span><br><span>scala&gt; list.tail<\/span><br><span>res6: scala.collection.mutable.<span>ListBuffer<\/span>[<span>Int<\/span>] = <span>ListBuffer<\/span>(<span>2<\/span>, <span>3<\/span>, <span>4<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u6dfb\u52a0\u5355\u4e2a\u5143\u7d20<\/span><\/span><br><span>scala&gt; list += <span>5<\/span><\/span><br><span>res7: list<span>.<span>type<\/span> <\/span>= <span>ListBuffer<\/span>(<span>1<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>, <span>5<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u6dfb\u52a0\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7684\u5217\u8868<\/span><\/span><br><span>scala&gt; list ++= <span>List<\/span>(<span>6<\/span>, <span>7<\/span>)<\/span><br><span>res8: list<span>.<span>type<\/span> <\/span>= <span>ListBuffer<\/span>(<span>1<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>, <span>5<\/span>, <span>6<\/span>, <span>7<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u6dfb\u52a0\u4e00\u4e2a\u53ef\u53d8\u7684\u5217\u8868<\/span><\/span><br><span>scala&gt; list ++= <span>ListBuffer<\/span>(<span>8<\/span>, <span>9<\/span>)<\/span><br><span>res9: list<span>.<span>type<\/span> <\/span>= <span>ListBuffer<\/span>(<span>1<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>, <span>5<\/span>, <span>6<\/span>, <span>7<\/span>, <span>8<\/span>, <span>9<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u5220\u9664\u5355\u4e2a\u5143\u7d20<\/span><\/span><br><span>scala&gt; list -= <span>9<\/span><\/span><br><span>res10: list<span>.<span>type<\/span> <\/span>= <span>ListBuffer<\/span>(<span>1<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>, <span>5<\/span>, <span>6<\/span>, <span>7<\/span>, <span>8<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u5220\u9664\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7684\u5217\u8868\u5b58\u5728\u7684\u5143\u7d20<\/span><\/span><br><span>scala&gt; list --= <span>List<\/span>(<span>7<\/span>,<span>8<\/span>)<\/span><br><span>res11: list<span>.<span>type<\/span> <\/span>= <span>ListBuffer<\/span>(<span>1<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>, <span>5<\/span>, <span>6<\/span>)<\/span><br><span><\/span><br><span><span>\/\/\u5220\u9664\u4e00\u4e2a\u53ef\u53d8\u7684\u5217\u8868\u5b58\u5728\u7684\u5143\u7d20<\/span><\/span><br><span>scala&gt; list --= <span>ListBuffer<\/span>(<span>5<\/span>,<span>6<\/span>)<\/span><br><span>res12: list<span>.<span>type<\/span> <\/span>= <span>ListBuffer<\/span>(<span>1<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>)<\/span><br><span><\/span><br><span><span>\/\/toList\u6839\u636e\u53ef\u53d8\u7684\u5217\u8868\u751f\u6210\u4e00\u4e2a\u4e0d\u53ef\u53d8\u5217\u8868\uff0c\u539f\u5217\u8868\u4e0d\u53d8<\/span><\/span><br><span>scala&gt; list.toList<\/span><br><span>res13: <span>List<\/span>[<span>Int<\/span>] = <span>List<\/span>(<span>1<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>)<\/span><br><span><\/span><br><span><span>\/\/toArray\u6839\u636e\u53ef\u53d8\u7684\u5217\u8868\u751f\u6210\u4e00\u4e2a\u65b0\u7684\u4e0d\u53ef\u53d8\u6570\u7ec4\uff0c\u539f\u5217\u8868\u4e0d\u53d8<\/span><\/span><br><span>scala&gt; list.toArray<\/span><br><span>res14: <span>Array<\/span>[<span>Int<\/span>] = <span>Array<\/span>(<span>1<\/span>, <span>2<\/span>, <span>3<\/span>, <span>4<\/span>)<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"<p>\u6570\u7ec4 scala\u4e2d\u6570\u7ec4\u7684\u6982\u5ff5\u662f\u548cJ&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/131970"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=131970"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/131970\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=131970"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=131970"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=131970"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}