编辑代码

package zxf;

import java.util.Scanner;

public class Text_grade {
    public static void main(String[] args) {
        System.out.println("请输入一个整数代表成绩：");
        Scanner sc = new Scanner(System.in);
        int grade = sc.nextInt();
        if (grade > 100 || grade < 0) {
            System.out.println();
            if (grade > 80) {
                System.out.println("该成绩等级为优");
            } else if (grade > 70) {
                System.out.println("该成绩等级为良");
            } else if (grade > 60) {
                System.out.println("该成绩等级为中");
            } else {
                System.out.println("该成绩为差");
            }
        }
    }
}