引用传递的三道范例

Posted 2021-02-06 cainame

1.对象传递

package test;

class test{
	private String name;
	private String age;
	public test(String name) {
		this.name=name;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getInfo() {
		return"姓名:"+name+" "+"年龄:"+age;
	}
}
public class 关键字 {
  public static void main(String[] args) {
   test t=new test("张三");
   fun(t);
   System.out.println(t.getName());//李四
}
  public static void fun(test demo) {
	  demo.setName("李四");
  }
}

2.传递String

public class 关键字 {
  public static void main(String[] args) {
   String s="wangwang";
   fun(s);
   System.out.println(s);//wangwang
}
  public static void fun(String str) {
	  str="caizhen";
  }
}

3.传递基本数据类型

public class 关键字 {
  public static void main(String[] args) {
    int s=520;
   fun(s);//参数传递,不涉及内存传递
   System.out.println(s);//520
}
  public static void fun(int temp) {//int temp=520,当时s还是520
	 temp=666;     
  }
}