Java 交换两数值变量的常用方法

        //1.加减运算交换
        double num1 = 0.01;
        double num2 = 9.99;
        //进行加减运算，利用赋值交换
        num1 = num1 + num2;
        num2 = num1 - num2;
        num1 = num1 - num2;
        System.out.println(num1);//输出 9.99
        System.out.println(num2);//输出 0.009999999999999787
        		

        //2.异或运算交换(只能用于整数)
        int num1 = 10;
        int num2 = 90;
        //进行加减运算，利用赋值交换
        num1 = num1 ^ num2;
        num2 = num1 ^ num2;
        num1 = num1 ^ num2;
        System.out.println(num1);//输出 90
        System.out.println(num2);//输出 10
        

        //3.引用中间变量交换
        double num1 = 0.01;
        double num2 = 9.99;
        //引用中间变量 temp，利用赋值进行交换
        double temp = num1;
        num1 = num2;
        num2 = temp;
        System.out.println(num1);//输出 9.99
        System.out.println(num2);//输出 0.01