需求說明：正確使用Arrays的sort()方法為陣列進行排序，效果如下圖所示。降序排列的寫法可以參考for(int i=scores.length-1;i>=0;i–){}

package homework;

import java.lang.reflect.Array;
import java.util.Arrays;
import java.util.Scanner;

public class 作業2Arrays類排序陣列 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
 

        System.out.println("請輸入5名學員的成績：");
        Scanner scanner=new Scanner(System.in);
        int xxx[]=new int[5];
        for (int i = 0; i < xxx.length; i++) {
            int scores = scanner.nextInt();
            xxx[i]=scores;
        }   
        Arrays.sort(xxx);
        System.out.println("學員成績按升序排列："
 
);
        for (int i = 0; i < xxx.length; i++) {
            System.out.print(xxx[i]+"\t");
        }
        System.out.println();
        System.out.println("學員成績按降序排列：");
        for (int i = xxx.length-1; i>=0; i--) {
            System.out.print(xxx[i]+"\t");
        }
    }

}