用java写的第一个程序

 1 package demo;
 2 import java.util.Scanner;
 3 
 4 public class StudentsScore {
 5     public static void main(String[] args) {
 6         Scanner sc = new Scanner(System.in);
 7         while(true) {
 8         System.out.print("请输入学生成绩：");
 9             int score;
10             score = sc.nextInt();
11             if (score <= 100 && score >= 80) {
12                 System.out.println("优秀");
13             }else if(score < 80 && score >= 70) {
14                 System.out.println("良好");
15             }else if(score < 70 && score >=60) {
16                 System.out.println("及格");
17             }else if(score >=0 &&score < 60) {
18                 System.out.println("不及格");
19             }else {
20                 System.out.println("输入错误");
21             }
22         }
23     }
24 }

小小纪念一下