---------- javap -c 产生的字节码文件----------
Compiled from "Atomicity.java"
public class Atomicity {
  int i;

  public Atomicity();
    Code:
       0: aload_0
       1: invokespecial #1                  // Method java/lang/Object."<init>":()V
       4: return

  void f1();
    Code:
       0: aload_0
       1: dup
       2: getfield      #2                  // Field i:I
       5: iconst_1
       6: iadd
       7: putfield      #2                  // Field i:I
      10: return

  void f2();
    Code:
       0: aload_0
       1: dup
       2: getfield      #2                  // Field i:I
       5: iconst_3
       6: iadd
       7: putfield      #2                  // Field i:I
      10: return
}

Output completed (0 sec consumed) - Normal Termination