Java基础实践一：for关键字的实现原理

Z时代
2024-01-10
分类：综合

java

Java源码：

/**
 * Demo.java
 * com.yuanchuangyun.libra.web
 *
 *
 *   ver     date              author
 * ──────────────────────────────────
 *            2017年5月19日         renguoqiang
 *
 * Copyright (c) 2017, yuanchuangyun All Rights Reserved.
*/
package com.yuanchuangyun.libra.web;
public class Demo {
    public void test(){
        for(int i= 0;i<5;i++){
            System.out.println(i);
        }
    }
}

Java反编译命令：

javap -c Demo.class >Demo.txt

Java反编译结果：

Compiled from "Demo.java"
public class com.yuanchuangyun.libra.web.Demo {
  public com.yuanchuangyun.libra.web.Demo();
    Code:
       0: aload_0       
       1: invokespecial #8                  // Method java/lang/Object."<init>":()V
       4: return        
  public void test();
    Code:
       0: iconst_0      
       1: istore_1      
2: goto          15
       5: getstatic     #15                 // Field java/lang/System.out:Ljava/io/PrintStream;
       8: iload_1       
       9: invokevirtual #21                 // Method java/io/PrintStream.println:(I)V
      12: iinc          1, 1
      15: iload_1       
      16: iconst_5      
      17: if_icmplt     5
      20: return        
}