JAVA 成績等級劃分

1. package 成績等級;
   
   import com.sun.jdi.event.Event;
   import com.sun.jdi.event.ExceptionEvent;
   
   import java.util.Scanner;
   
   public class Score {
       public static void main(String[] args) {
           Scanner scanner = new Scanner(System.in);
           System.out.println("請輸入成績：");
           double score = scanner.nextDouble();
           scanner.close();
   //判斷語句
           if (score > 100 || score < 0) {
               System.out.println("輸入的成績不在0～100的範圍内");
           } else if (score >= 90) {
               System.out.println("A");
           } else if (score >= 80) {
               System.out.println("B");
           } else if (score >= 60) {
               System.out.println("C");
           } else {
               System.out.println("D");
           }
       }
   }