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