7. 控制台输入

1、控制台输入

类似于python中的input语句

import java.util.Scanner;
public class Demo4 {
    	public static void main(String[] args) {
         // 实例化一个对象
    		Scanner superman = new Scanner(System.in);
    		int n;
    		System.out.println("请输入一个整数:");
    		n = superman.nextInt();
    		System.out.println("我今年" + n + "岁！");
    	}
}

结果是：

2、习题

第一题代码：

import java.util.Scanner;
public class Demo4 {
    	public static void main(String[] args) {
    		Scanner superman = new Scanner(System.in);
    		int m;
    		int n;
    		int a;
    		int b;
    		int c;
        int d;
        System.out.println("请输入整数m:");
        m = superman.nextInt();
        System.out.println("请输入整数n:");
        n = superman.nextInt();
        a = m + n;
        b = m - n;
        c = m * n;
        d = m / n;
        System.out.println(m + "+" + n + "=" + a);
        System.out.println(m + "-" + n + "=" + b);
        System.out.println(m + "*" + n + "=" + c);
        System.out.println(m + "/" + n + "=" + d);
    }
}

结果是：
第二题代码：
没有考虑等于的情况

import java.util.Scanner;
public class Test {
    	public static void main(String[] args) {
    		Scanner superman = new Scanner(System.in);
    		int m;
    		int n;
    		System.out.println("请输入整数m:");
    		m = superman.nextInt();
    		System.out.println("请输入整数n:");
        n = superman.nextInt();
        String str = m > n ? "m的值大" : "n的值大";
        System.out.println(str);	
	}
}

结果是：
考虑等于的情况

import java.util.Scanner;
public class Test {
    	public static void main(String[] args) {
    		Scanner superman = new Scanner(System.in);
    		int m;
    		int n;
    		System.out.println("请输入整数m:");
    		m = superman.nextInt();
    		System.out.println("请输入整数n:");
        n = superman.nextInt();
        String str = m > n ? "m的值大" : m == n ? "m等于n" : "n的值大";
        System.out.println(str);
	}
}

结果是：
第三题代码：

import java.util.Scanner;
public class Test {
    	public static void main(String[] args) {
    		Scanner superman = new Scanner(System.in);
    		int m;
    		System.out.println("请输入整数m:");
    		m = superman.nextInt();
    		String str = m % 2 == 0 ? "m是偶数" : "m是奇数";
    		System.out.println(str);
    }
}

结果是：