?引用傳遞：

不同棧內存可以指向同一塊堆內存，不同棧內存可以對一塊堆內存進行修改

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范例一：

class Message {private int num = 10;public Message(int num) {this.num = num;}public void setNum(int num) {this.num = num;}public int getNum() {return this.num;} } public class test1 {public static void main(String args[]) {Message msg = new Message(30);fun(msg);//引用傳遞 System.out.println(msg.getNum());} public static void fun(Message temp) {temp.setNum(100);} } //輸出 100

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內存分析：

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范例二：

public class test1 {public static void main(String args[]) {String msg = "hello";fun(msg);//引用傳遞 System.out.println(msg);} public static void fun(String temp) {temp = "world";} }//輸出：hello

輸出結果仍為hello，msg的值沒有被改變

原因：String類對象的內容一旦聲明，則不可改變。對象內容的改變，依靠的是引用地址的改變

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范例三：

class Message {private String info = "nihao";public Message(String info) {this.info = info;}public void setInfo(String info) {this.info = info;}public String getInfo() {return this.info ;} } public class test1 {public static void main(String args[]) {Message msg = new Message("hello");fun(msg);//引用傳遞 System.out.println(msg.getInfo());} public static void fun(Message temp) {temp.setInfo("world");} }//輸出world

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內存分析：

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class Member {private int mid;private String name;private Member child;private Car car;public Member(int mid, String name) {this.mid = mid;this.name = name;}public String getInfo() {return "編號:"+this.mid+"\n"+"名字"+this.name; }public void setCar(Car car) {this.car = car; }public Car getCar() {return this.car; }public void setChild(Member child) {this.child = child;}public Member getChild() {return this.child;} }class Car {private Member member;private String name;public Car(String name) {this.name = name;}public String getInfo() {return "車的名字"+name;}public void setMember(Member member) {this.member = member;}public Member getMember() {return this.member;} }public class test1 {public static void main(String args[]) {Member m = new Member(1,"張三");Member ch = new Member(2,"李四");Car c = new Car("寶馬");Car cc = new Car("奔馳");m.setCar(c);c.setMember(m);ch.setCar(cc);cc.setMember(ch);m.setChild(ch);System.out.println(m.getCar().getInfo());System.out.println(c.getMember().getInfo());System.out.println(m.getChild().getCar().getInfo());} }

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轉載于:https://www.cnblogs.com/xhnxhnu/p/9141704.html

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