Method int top2()
   0 aload_0          //Push the object reference(this) at index
                      //0 of the local variable table.
   1 astore_2         //Pop the object reference(this) and store
                      //it at index 2 of the local variable table.
   2 aload_2          //Push the object reference(this).
   3 monitorenter     //Pop the object reference(this) and acquire
                      //the object's monitor.
   4 aload_0          //Beginning of the synchronized block. Push
                      //the object reference(this) at index 0 of
                      //the local variable table.
   5 getfield #6 <Field int intArr[]>
                      //Pop the object reference(this) and push
                      //the object reference for intArr accessed
                      //from the constant pool.
   8 iconst_0         //Push 0.
   9 iaload           //Pop the top two values and push the value
                      //at index 0 of intArr.
  10 istore_1         //Pop the value and store it at index 1 of
                      //the local variable table.
  11 jsr 19           //Push the address of the next opcode(14)
                      //and jump to location 19.
  14 iload_1          //Push the value at index 1 of the local
                      //variable table.
  15 ireturn          //Pop top value and push it on the operand
                      //stack of the invoking method. Exit method.
  16 aload_2          //End of the synchronized block. Push the
                      //object reference(this) at index 2 of the
                      //local variable table.
  17 monitorexit      //Pop the object reference(this) and exit
                      //the monitor.
  18 athrow           //Pop the object reference(this) and throw
                      //an exception.
  19 astore_3         //Pop the return address(14) and store it at
                      //index 3 of the local variable table.
  20 aload_2          //Push the object reference(this) at index 2
                      //of the local variable table.
  21 monitorexit      //Pop the object reference(this) and exit
                      //the monitor.
  22 ret 3            //Return to the location indicated by index
                      //3 of the local variable table(14).
Exception table:      //If any exception occurs betweenfrom  to  target type //location 4 (inclusive) and location 4    16    16   any  //16 (exclusive) jump to location 16.