按照如下代码进行测试，理论上同步代码块里应该对对象添加偏向锁，可是为什么从输出上来看，添加的是轻量锁呢

java 版本 1.8.0_192-b12

 public static void test(){   Object o = new Object();   System.out.println(ClassLayout.parseInstance(o).toPrintable());   synchronized (o){    System.out.println(ClassLayout.parseInstance(o).toPrintable());   }   System.out.println(ClassLayout.parseInstance(o).toPrintable());  } 

java.lang.Object object internals:  OFFSET  SIZE   TYPE DESCRIPTION                               VALUE       0     4        (object header)                           01 00 00 00 (00000001 00000000 00000000 00000000) (1)       4     4        (object header)                           00 00 00 00 (00000000 00000000 00000000 00000000) (0)       8     4        (object header)                           e5 01 00 f8 (11100101 00000001 00000000 11111000) (-134217243)   java.lang.Object object internals:  OFFSET  SIZE   TYPE DESCRIPTION                               VALUE       0     4        (object header)                           b0 f4 70 01 (10110000 11110100 01110000 00000001) (24179888)       4     4        (object header)                           00 00 00 00 (00000000 00000000 00000000 00000000) (0)       8     4        (object header)                           e5 01 00 f8 (11100101 00000001 00000000 11111000) (-134217243)   java.lang.Object object internals:  OFFSET  SIZE   TYPE DESCRIPTION                               VALUE       0     4        (object header)                           01 00 00 00 (00000001 00000000 00000000 00000000) (1)       4     4        (object header)                           00 00 00 00 (00000000 00000000 00000000 00000000) (0)       8     4        (object header)                           e5 01 00 f8 (11100101 00000001 00000000 11111000) (-134217243)