java实例练习

1.不使用中间变量交换两个数

public class Exchange {    public static void main(String[] args) {        Scanner scanner = new Scanner(System.in);        System.out.PRintln("请输入一个整数：");        Long num1 = scanner.nextLong();        System.out.println("请输入一个整数：");        Long num2 = scanner.nextLong();        System.out.println("交换前num1:"+num1+"     交换前num2:"+num2 );        num1 = num1^num2;        num2 = num2^num1;        num1 = num1^num2;        System.out.println("交换后num1:"+num1+"     交换后num2:"+num2 );    }}

2.利用三目运算符判断奇偶性

public class ParityCheck {    public static void main(String[] args) {        Scanner scanner = new Scanner(System.in);        System.out.println("请输入一个整数：");        Long num = scanner.nextLong();        String s = (num%2==0)?"这个数是：偶数":"这个数是：奇数";        System.out.println(s);    }}