实现2个整形变量的交换

实现2个整形变量的交换

        int a = 10;
	int b = 20;
	System.out.println("a:"+a+",b:"+b);

	//方法1:使用第三方变量（开发中常见）
	int c ;
	c = a;
	a = b;
	b = c;
	System.out.println("a:"+a+",b:"+b);

	//使用第2种方式
	a = a + b;
	b = a - b;//b = a + b - b = a
	a = a - b;//a = a + b - a = b

	//方式3:用位异或实现
	//左边:a,b,a
	//右边:a ^ b
	a = a ^ b;
	b = a ^ b;//a ^ b ^ b = a
	a = a ^ b;//a ^ b ^ a = b

	//方式4:一句话搞定
	b = (a+b) - (a=b)
	 
	System.out.println("a:"+a+",b:"+b);