Java中的值传递和引用传递实例介绍

package object.reference;
public class people {
    private string name;
    private int age;
    public people(){
    }
    public people(string name, int age) {
        super();
        this.name = name;
        this.age = age;
    }
    public string tostring(){
        return "name:" + name + " age:" + age;
    }
    public string getname() {
        return name;
    }
    public int getage() {
        return age;
    }
    public void setname(string name) {
        this.name = name;
    }
    public void setage(int age) {
        this.age = age;
    }
}

package object.reference;
/*  java 中的值传递和引用传递
    //www.jb51.net/clara/archive/2011/09/17/2179493.html
    java 中没有引用传递，都是值传递的
*/
public class test {
    public static void swap(people a, people b, boolean flag) {
        if (flag) {
            // 可以通过传递副本修改对象的值
            a.setname("changename");
            a.setage(100);
        } else {
            //副本交换，并不影响主程序的指针
            people c = a;
            a = b;
            b = c;
        }
    }
    public static void main(string[] args) {
        people p1 = new people("yingjie", 23);
        people p2 = new people("yuexin", 20);
        swap(p1, p2,false);//传递的是p1,p2的副本，函数调用前后p1,p2没任何改变
        swap(p1, p2,true);//传递的是p1,p2的副本，可以通过传递副本修改对象的值,函数调用前后p1对象内容改变
    }
}