问题描述：
从键盘读入学生成绩，找出最高分，并输出学生成绩等级。
成绩>=最高分-10 等级为’A’ 成绩>=最高分-20 等级为’B’
成绩>=最高分-30 等级为’C’ 其余等级为’D’
提示：先读入学生人数，根据人数创建int数组，存放学生成绩。
请输入学生人数:5
请输入5个成绩
56
74
89
41
89
最高分是：89
student 0 score is 56 grade is D
student 1 score is 74 grade is B
student 2 score is 89 grade is A
student 3 score is 41 grade is D
student 4 score is 89 grade is A
代码分享：
import java.util.Scanner;
public class One {
public static void main(String[] args) {
System.out.print("请输入学生人数:");
Scanner in = new Scanner(System.in);
int n = Integer.parseInt(in.nextLine());
int stu[] = new int[n];
int max = 0;
for(int i=0; i<n; i++){
System.out.print("请输入第"+(i+1)+"位学生成绩：");
stu[i] = Integer.parseInt(in.nextLine());
if(stu[i]>max){
max = stu[i];
}
}
System.out.println("学生成绩分析：");
System.out.println("最高成绩:"+max);
for(int j=0; j<n; j++){
if(stu[j]>max-10){
System.out.println("Student "+j+" score is "+stu[j]+" garde is A");
}else{
if(stu[j]>max-20){
System.out.println("Student "+j+" score is "+stu[j]+" garde is B");
}else{
if(stu[j]>max-30){
System.out.println("Student "+j+" score is "+stu[j]+" garde is C");
}else{
System.out.println("Student "+j+" score is "+stu[j]+" garde is D");
}
}
}
}
}
}