package com.base;

public class Swap {

public static void main(String[] args) {

int x = 5;

int y = 10;

swap(x,y);

System.out.println("使用swap1()交换：");

System.out.println(x);

System.out.println(y);

Value v = new Value(5,10);

swap(v);

System.out.println("使用swap()2交换：");

System.out.println(v.getX());

System.out.println(v.getY());

}

// 无效的交换：形参的改变无法反作用于实参

public static void swap(int x,int y) {

int temp = x;

x = y;

y = temp;

}

// 有效的交换：通过引用（变量指向一个对象）来修改成员变量

public static void swap(Value value) {

int temp = value.getX();

value.setX(value.getY() );

value.setY(temp);

}

}

class Value{

private int x;

private int y;

public Value(int x,int y) {

this.x = x;

this.y = y;

}

public int getX() {

return x;

}

public void setX(int x) {

this.x = x;

}

public int getY() {

return y;

}

public void setY(int y) {

this.y = y;

}

}