传引述

传引用
测试程序，引用

public class Demo {public static void main(String[] args) {DemoPro pro = new DemoPro(20, "lishan");System.out.println("Before change, pro = " + pro.getAge());changeData(pro);System.out.println("After changeData(n), pro = " + pro.getAge());}public static void changeData(DemoPro pro) {pro = new DemoPro(26, "liudehua");System.out.println(pro.getAge());}}

输出结果：

Before change, pro = 2026After changeData(n), pro = 20

[color=red][/color]



如果代码如下：

public class Demo {public static void main(String[] args) {DemoPro pro = new DemoPro(20, "lishan");System.out.println("Before change, pro = " + pro.getAge());changeData(pro);System.out.println("After changeData(n), pro = " + pro.getAge());}public static void changeData(DemoPro pro) {//pro = new DemoPro(26, "liudehua");pro.setAge(26) ;System.out.println(pro.getAge());}}

输出结果：

Before change, pro = 2026After changeData(n), pro = 26

1 楼 zczh3 2011-03-23   N多年前 已经很多人讨论N遍：
JAVA 与 C 只存在 传值，Java 不存在传引用，C不存在传地址
只有C++ 支持传引用 与 传值

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