Java虚拟机之byte相加

源代码：

class Hello{
  public static void main(String[] argv){
      byte a = 0x00;
      byte b = 0x01;
      byte c = (byte)(a+b);  
      
      System.out.println("This is a test");
  }
}

 反编译：

d:\>javap -c Hello

Compiled from "Hello.java"
class Hello extends java.lang.Object{
Hello();
  Code:
   0:   aload_0
   1:   invokespecial   #1; //Method java/lang/Object."<init>":()V
   4:   return

public static void main(java.lang.String[]);
  Code:
   0:   iconst_0
   1:   istore_1
   2:   iconst_1
   3:   istore_2
   4:   iload_1
   5:   iload_2
   6:   iadd
   7:   i2b
   8:   istore_3
   9:   getstatic       #2; //Field java/lang/System.out:Ljava/io/PrintStream;
   12:  ldc     #3; //String This is a test
   14:  invokevirtual   #4; //Method java/io/PrintStream.println:(Ljava/lang/String;)V
   17:  return

}

学习学习虚拟机。

评论

1 楼 决胜千Li 2010-03-19  

看不懂,可以解释下吗?