JAVA if else 语句

package com.wenku.www;

import java.util.Scanner;

public class ShunXUDemo {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        System.out.println("输入成绩");
        double d=scanner.nextDouble();
        if(d==100){
            System.out.println("满分");
        }else if(d>=90&& d<=100){
            System.out.println("优秀");
        }else if(d>=60&& d<=90){
            System.out.println("及格");
        }else if(d<60&& d>=0){
            System.out.println("不及格");
        }else {
            System.out.println("数字不合法");
        }
        scanner.close();
    }
}