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 中的值傳遞和引用傳遞
    //www.49028c.com/clara/archive/2011/09/17/2179493.html
    java 中沒有引用傳遞，都是值傳遞的
*/
public class Test {
    public static void swap(People a, People b, boolean flag) {
        if (flag) {
            // 可以通過傳遞副本修改對象的值
            a.setName("changeName");
            a.setAge(100);
        } else {
            //副本交換，并不影響主程序的指針
            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);//傳遞的是p1,p2的副本，函數調用前后p1,p2沒任何改變
        swap(p1, p2,true);//傳遞的是p1,p2的副本，可以通過傳遞副本修改對象的值,函數調用前后p1對象內容改變
    }
}