多分支

if 

else if

else

 

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();
    if (age>=18){
        System.out.println("成年了");

    }else if(age<6){
        System.out.println("宝宝");

    }else{
        System.out.println("学生");

    }
    
    }
    
}