键盘输入

import java.util.Scanner;
public class Input01{
    public static void main(String[] args){
    
    Scanner myScanner = new Scanner(System.in);
    System.out.println("请输入名称");
    String name = myScanner.next();//字符输入
    System.out.println("名称:"+name);
    }
    
}

 上面是键盘输入字符，下面是键盘输入数字

import java.util.Scanner;
public class If01{
    public static void main(String[] args){
    
    Scanner myScanner = new Scanner(System.in);
    System.out.println("请输入年龄");
    int age = myScanner.nextInt();//数字输入
    if (age>=18){
        System.out.println("成年了");

    }else{
        System.out.println("未成年");

    }
    
    }
    
}