{"id":172053,"date":"2020-10-22T01:15:44","date_gmt":"2020-10-21T17:15:44","guid":{"rendered":"http:\/\/4563.org\/?p=172053"},"modified":"2020-10-22T01:15:44","modified_gmt":"2020-10-21T17:15:44","slug":"%e8%b8%a9%e4%ba%86%e4%b8%80%e4%b8%aa-java-%e7%bc%96%e8%af%91%e6%97%b6%e5%92%8c%e8%bf%90%e8%a1%8c%e6%97%b6%e7%8e%af%e5%a2%83%e4%b8%8d%e4%b8%80%e8%87%b4%e5%af%bc%e8%87%b4%e7%9a%84%e4%b8%80%e4%b8%aa","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=172053","title":{"rendered":"\u8e29\u4e86\u4e00\u4e2a Java \u7f16\u8bd1\u65f6\u548c\u8fd0\u884c\u65f6\u73af\u5883\u4e0d\u4e00\u81f4\u5bfc\u81f4\u7684\u4e00\u4e2a\u5751"},"content":{"rendered":"
\n
\n
\n

\u8e29\u4e86\u4e00\u4e2a Java \u7f16\u8bd1\u65f6\u548c\u8fd0\u884c\u65f6\u73af\u5883\u4e0d\u4e00\u81f4\u5bfc\u81f4\u7684\u4e00\u4e2a\u5751 <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : pursuer <\/span> <\/i> 2<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
\u8fd9\u4e24\u5929\u6d4b\u8bd5\u4e86\u4e00\u6bb5\u4ee3\u7801\uff0c\u5728 Java11 \u4e0a\u6b63\u5e38\u8fd0\u884c\uff0c\u5728 android \u4e0a\u8fd0\u884c\u62a5 NoSuchMethodError \u5f02\u5e38\uff0c\u5f02\u5e38\u5904\u5c31\u4e00\u53e5<\/p>\n

\/\/buf \u662f\u4e00\u4e2a ByteBuffer
buf.flip()<\/p>\n

\u62a5\u7684\u5f02\u5e38\u662f
java.lang.NoSuchMethodError: No virtual method flip()Ljava.nio.ByteBuffer in class java.nio.ByteBuffer \uff08\u6211\u51ed\u8bb0\u5fc6\u8fd8\u539f\u7684\uff0c\u53ef\u80fd\u4e0d\u5b8c\u5168\u4e00\u6837\uff09<\/p>\n

\u901a\u5e38\u51fa\u73b0\u8fd9\u6837\u7684\u95ee\u9898\u7684\u65f6\u5019\u6211\u7b2c\u4e00\u53cd\u5e94\u662f\u4f7f\u7528\u4e86 android \u4e0d\u652f\u6301\u7684\u9ad8\u7248\u672c API \u5bfc\u81f4\u7684\u3002\u4f46\u7ffb\u4e86\u4e0b Java \u7684 API \u6587\u6863\uff0c\u53d1\u73b0 flip \u51fd\u6570\u5728\u6709 ByteBuffer \u7684\u65f6\u5019\u5c31\u5b58\u5728\u4e86\uff0c\u7136\u540e\u518d\u770b\u65b9\u6cd5\u7b7e\u540d\uff0c\u6ce8\u610f\u5230\u62a5\u5f02\u5e38\u7684\u51fd\u6570\u7b7e\u540d\u662f flip()Ljava.nio.ByteBuffer\uff0c\u4f46\u67e5\u9605\u7684\u6587\u6863\u4e2d\u8fd9\u4e2a\u51fd\u6570\u7684\u7b7e\u540d\u5e94\u8be5\u662f flip():Ljava.nio.Buffer\uff0c\u731c\u6d4b\u662f\u4e0d\u662f\u7f16\u8bd1\u7684\u65f6\u5019\u9009\u62e9\u8c03\u7528\u4e86\u53e6\u4e00\u4e2a\u9ad8\u7248\u672c\u4e2d\u5b58\u5728\u7684\u65b9\u6cd5\u7b7e\u540d\uff0c\u4f46\u662f\u4e0d\u77e5\u9053\u600e\u4e48\u5904\u7406\u3002
\u540e\u6765\u5728 StackOverflow \u4e0a\u627e\u5230\u4e86\u8fd9\u4e2a\u95ee\u9898\u7684\u89e3\u7b54\u3002\u5728 Java9 \u7684\u65f6\u5019 ByteBuffer \u8986\u5199\u4e86\u7236\u7c7b Buffer \u7684 flip,mark,reset \u7b49\u51fd\u6570\uff0c\u5e76\u5c06\u8fd4\u56de\u503c\u6539\u4e3a\u4e86 ByteBuffer\uff0c\u5bfc\u81f4\u9ad8\u7248\u672c\u7f16\u8bd1\u7684\u65f6\u5019,javac \u9009\u62e9\u8c03\u7528\u4e86 flip()Ljava.nio.ByteBuffer\uff0c\u5728\u4f4e\u7248\u672c\u7684\u8fd0\u884c\u73af\u5883\u4e2d\u6ca1\u6709\u8fd9\u4e2a\u65b9\u6cd5\u7b7e\u540d\uff0c\u5bfc\u81f4\u51fa\u9519\u3002\u89e3\u51b3\u65b9\u6cd5\u662f((Buffer)buf).flip()
\u611f\u89c9 Java \u5728\u8fd9\u5757\u7684\u8bbe\u8ba1\u6709\u4e9b\u5947\u7279\uff0cJava \u6ca1\u6709\u8fd4\u56de\u503c\u91cd\u8f7d\uff0c\u4f46 JVM \u5b9e\u73b0\u4e0a\u5374\u4f1a\u5c06\u4e0d\u540c\u8fd4\u56de\u503c\u8ba4\u5b9a\u4e3a\u4e0d\u540c\u7684\u65b9\u6cd5\u3002 <\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (6<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : pursuer <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u66f4\u6b63\u4e00\u4e0b\uff0c\u6211\u518d\u6b21\u68c0\u67e5\u6587\u6863\u7684\u65f6\u5019\u53d1\u73b0 Java8 \u7684\u65f6\u5019 flip \u65b9\u6cd5\u662f final \u7684\uff0c\u4f46 Java11 \u540e\u53bb\u6389\u4e86\uff0c\u5bfc\u81f4\u7f16\u8bd1\u5668\u5728\u9ad8\u7248\u672c\u4e0b\u4f7f\u7528\u4e86 invokevirtual \u6307\u4ee4\u8c03\u7528 flip \u51fd\u6570\uff0c\u5bfc\u81f4\u4f4e\u7248\u672c\u4ea7\u751f\u5f02\u5e38\u3002\u4e0a\u9762\u63d0\u5230\u7684\u201cJVM \u5c06\u4e0d\u540c\u8fd4\u56de\u503c\u8ba4\u5b9a\u4e3a\u4e0d\u540c\u65b9\u6cd5\u201c\u8fd9\u4e00\u8bf4\u6cd5\u662f\u4e0d\u6210\u7acb\u7684\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : pursuer <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u518d\u6b21\u66f4\u6b63\uff0c\u6211\u67e5\u5230 final \u5173\u952e\u5b57\u5bf9\u5b57\u8282\u7801\u751f\u6210\u6ca1\u6709\u5f71\u54cd\uff0c\u6240\u4ee5\u4e0a\u9762\u8bf4\u7684\u6307\u4ee4\u5dee\u5f02\u4e5f\u662f\u4e0d\u5bf9\u7684\uff0c\u90a3\u53ef\u80fd\u8fd8\u662f\u56e0\u4e3a\u65b9\u6cd5\u7b7e\u540d\u7684\u95ee\u9898\u5427\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : SoloCompany <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    java \u517c\u5bb9\u6027\u5982\u679c\u90fd\u80fd\u6311\u5254\u7684\u8bdd\u522b\u7684\u5c31\u66f4\u4e0d\u8981\u8bf4\u4e86<\/p>\n

    \u4f60\u8bf4\u7684\u7684\u8fd9\u79cd\u95ee\u9898\u662f\u5e38\u89c1\u60c5\u5f62, \u5982\u679c\u4f60\u4e00\u5b9a\u9700\u8981\u4f7f\u7528\u9ad8\u7248\u672c\u7684 javac \u7684\u8bdd, \u6b63\u786e\u7684\u505a\u6cd5\u662f\u7ed9 javac \u6307\u5b9a bootstrapclasspath, \u4f7f\u7528 JAVA 8 \u7684 rt.jar, \u4ec5\u4ec5\u9760 -source \/ -target \u53c2\u6570\u662f\u65e0\u6cd5\u4fdd\u8bc1 bytecode \u80fd\u5728\u4f4e\u7248\u672c\u7684 runtime \u4e0b\u8fd0\u884c <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : abcbuzhiming <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    java \u597d\u50cf\u4ece\u6765\u6ca1\u4fdd\u8bc1\u8bf4\u9ad8\u7248\u672c\u7f16\u8bd1\u7684 class \u53ef\u4ee5\u5728\u4f4e\u7248\u672c jvm \u4e0a\u8dd1\u554a\uff0c\u6211\u8bb0\u5f97 jvm \u4e00\u76f4\u8bf4\u7684\u662f\u5411\u4e0a\u517c\u5bb9\uff0c\u5373\u4f4e\u7248\u672c jdk \u7f16\u8bd1\u7684 class \u53ef\u4ee5\u8dd1\u5728\u9ad8\u7248\u672c jvm \u4e0a\uff08\u4f46\u662f\u4ece java9 \u5f00\u59cb\u8fd9\u4e5f\u4e0d\u5b8c\u5168\u4fdd\u8bc1\u4e86\uff0c\u597d\u50cf\u53ea\u4fdd\u8bc1 3 \u4e2a\u7248\u672c\u4e4b\u7c7b\u662f\u517c\u5bb9\u7684\uff09\uff1b\u5411\u4e0b\u517c\u5bb9\u6ca1\u542c\u8bf4\u8fc7 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : pursuer <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @SoloCompany
    @abcbuzhiming
    \u65e0\u5948 Android \u7684\u8fd0\u884c\u65f6\u788e\u7247\u5316\u592a\u5389\u5bb3\uff0c\u8fd8\u662f\u4f1a\u9700\u8981\u4f7f\u7528\u9ad8\u7248\u672c android.jar \u7f16\u8bd1\u540c\u65f6\u8981\u5e94\u7528\u517c\u5bb9\u4f4e\u7248\u672c\u7cfb\u7edf\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Goooogle <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    Java \u5728\u7f16\u8bd1\u65f6\uff0c\u4f1a\u5c06\u4f7f\u7528\u5230\u7684\u65b9\u6cd5\u7684\u7b7e\u540d\u56fa\u5316\u5728\u5b57\u8282\u7801\u4e2d\u7684\u5e38\u91cf\u6c60\u4e2d\uff08\u7c7b\u578b\u4e3a CONSTANT_Methodref_info \uff09\uff0c\u5f53\u8fd0\u884c\u65f6\u548c\u7f16\u8bd1\u65f6\u7684\u7b7e\u540d\u4e0d\u4e00\u6837\u65f6\uff0c\u5c31\u4f1a\u62a5\u8fd9\u4e2a\u9519\u8bef\u3002\u5373\u4f7f\u662f\u201c\u5c06\u53c2\u6570\u7c7b\u578b\u6539\u4e3a\u5176\u7236\u7c7b\u578b\u201d\u8fd9\u79cd\u76f4\u89c2\u770b\u8d77\u6765\u53ef\u884c\u7684\u65b9\u5f0f\u4e5f\u4e0d\u884c\u3002
    \u4f60\u4f8b\u5b50\u4e2d\uff0cByteBuffer \u662f Buffer \u7684\u5b50\u7c7b\u578b\uff0c\u5355\u7eaf\u4ece\u8bed\u6cd5\u4e0a\u8bb2\uff0c\u628a\u4e00\u4e2a\u65b9\u6cd5\u7684 ByteBuffer \u53c2\u6570\u7684\u7c7b\u578b\u66ff\u6362\u6210 Buffer\uff0c\u6240\u6709\u8fd9\u4e2a\u65b9\u6cd5\u7684\u8c03\u7528\u65b9\u90fd\u80fd\u7ee7\u7eed\u8c03\u7528\uff0c\u4e0d\u4f1a\u6709\u4efb\u4f55\u95ee\u9898\uff0c\u4f46\u5728\u7f16\u8bd1\u540e\u7684\u65b9\u6cd5\u6267\u884c\u65f6\u5148\u53bb\u5e38\u91cf\u6c60\u627e\u5230\u5bf9\u5e94\u7684\u7b26\u53f7\u5f15\u7528\uff0c\u4f46\u8be5\u7b26\u53f7\u5f15\u7528\u5728\u8fd0\u884c\u65f6\u73af\u5883\u4e2d\u6ca1\u6709\uff0c\u4e0d\u4f1a\u5224\u65ad\u7ee7\u627f\u5173\u7cfb\uff0c\u800c\u662f\u76f4\u63a5\u629b\u51fa\u5f02\u5e38\u3002<\/p>\n

    \u524d\u6bb5\u65f6\u95f4\u521a\u78b0\u5230\u8fd9\u4e2a\u95ee\u9898\u3002 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n","protected":false},"excerpt":{"rendered":"

    \u8e29\u4e86\u4e00\u4e2a Java \u7f16\u8bd1\u65f6\u548c\u8fd0\u884c\u65f6…<\/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\/172053"}],"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=172053"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/172053\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=172053"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=172053"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=172053"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}