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);
    }
}