java数据传递例子+内存分析

一、引用传递

1、例子1

package com.jikexueyuan.ref;

class Ref1{
    int temp = 10;

}

public class RefDemo01 {
    public static void main(String args[]){
        Ref1 r1 =new Ref1();
        r1.temp = 20;
        System.out.println(r1.temp);
        tell(r1);
        System.out.println(r1.temp);
    }
    public static void tell(Ref1 r2){
        r2.temp = 30;
    }

}

20
30

2、例子2

 package com.jikexueyuan.ref;

 public class RefDemo02 {

     public static void main(String[] args) {
         String str1 = "Hello";
         System.out.println(str1);
         tell(str1);
         System.out.println(str1);
     }
     public static void tell(String str2){
         str2="jike";
     }

 }

Hello
Hello

 package com.jikexueyuan.ref;

 class Ref2{
     String temp = "hello";
 }

 public class RefDemo03 {
     public static void main(String args[]){
         Ref2  r1 = new Ref2();
         r1.temp="jike";
         System.out.println(r1.temp);
         tell(r1);
         System.out.println(r1.temp);
     }

     public static void tell(Ref2  r2){
         r2.temp="xueyuan";
     }
 }
jike
xueyuan