新建Decompilation.java文件

java">public class Decompilation {private Object object = new Object();public void insert(Thread thread) {synchronized (object) {}}
}

编译

javac Decompilation.java

反编译获得字节码指令

javap -verbose Decompilation.class

 public void insert(java.lang.Thread);descriptor: (Ljava/lang/Thread;)Vflags: ACC_PUBLICCode:stack=2, locals=4, args_size=20: aload_01: getfield      #3                  // Field object:Ljava/lang/Object;4: dup5: astore_26: monitorenter               // 要获取到锁7: aload_28: monitorexit                // 释放锁9: goto          1712: astore_313: aload_214: monitorexit               // 释放锁，第二个出口。一个锁入口，两个锁出口（正常退出 + 异常退出）15: aload_316: athrow17: returnException table:from    to  target type7     9    12   any12    15    12   anyLineNumberTable:line 5: 0line 7: 7line 8: 17StackMapTable: number_of_entries = 2frame_type = 255 /* full_frame */offset_delta = 12locals = [ class Decompilation, class java/lang/Thread, class java/lang/Object ]stack = [ class java/lang/Throwable ]frame_type = 250 /* chop */offset_delta = 4