题目：偷下懒直接用博主的图片
package com.atguigu.exer;
import java.util.Scanner;
public class ArrayDemo01 {
?? ?public static void main(String[] args) {
?? ??? ?//1.使用Scanner读取学生个数
?? ??? ?Scanner scan = new Scanner(System.in);
?? ??? ?System.out.println("请输入学生个数：");
?? ??? ?int number = scan.nextInt();
?? ??? ?//2.创建数组，存储学生成绩
?? ??? ?int[] scores = new int[number];
?? ??? ?//3.给数组元素赋值
?? ??? ?int maxScore = 0;
?? ??? ?System.out.println("请输入" + number + "个学生成绩");
?? ??? ?for (int i = 0; i < scores.length; i++) {
?? ??? ??? ?scores[i] = scan.nextInt();? ?
?? ??? ??? ?if(maxScore < scores[i]) {
?? ??? ??? ??? ?maxScore = scores[i];
?? ??? ??? ?}
?? ??? ??? ?
?? ??? ?}
?? ??? ?char dengji;
?? ??? ?for (int i = 0; i < scores.length; i++) {
?? ??? ??? ?if(scores[i] >= maxScore - 10) {
?? ??? ??? ??? ?dengji = 'A';
?? ??? ??? ?}else if(scores[i] >= maxScore - 20) {
?? ??? ??? ??? ?dengji = 'B';
?? ??? ??? ?}else if(scores[i] >= maxScore - 30) {
?? ??? ??? ??? ?dengji = 'C';
?? ??? ??? ?}else {
?? ??? ??? ??? ?dengji = 'D';
?? ??? ??? ?}
?? ??? ??? ?System.out.println("student"+i+" score is" +scores[i]+" grade is "+ dengji);
?? ??? ?}?? ?
?? ??? ?
?? ?}
}
?//不管是做题还是工作，在没有头绪之前，都可以先试着把题目逐步分解成一个个小问题，然后分步完成每一个小问题。在这次编写的过程中忘记了几个基本数据类型和他的用法，上面的char定义字符就忘了，忘了就回过头去记。今天主要还是学会了如何遍历数组以及通过Scanner给数组赋值。明天接着冲，勇敢牛牛不怕困难，哈哈哈