java 不会写帮解答一下

java不会写帮忙解答 要有全过程和讲解 感谢各位 12345667886790凑字数

import java.util.Random;
import java.util.Scanner;
public class Main{
    public static void main(String[] args) {
        int [] codes = new int [5];
        Scanner sc = new Scanner(System.in);
        System.out.println("请依次输入5名同学的学号： ");
        for (int i = 0; i < codes.length; i++) {
            int code = sc.nextInt() ;
            codes[i] = code;
        }
        Random r = new Random();
        for (int i = 0; i < codes.length; i++) {
            int index = r.nextInt(codes.length);
            int temp = codes[index] ;
            codes[index] = codes[i] ;
            codes[i] = temp;
        }

        for (int i = 0; i < codes.length; i++) {
            System.out.print(codes[i] + " ");
        }
    }
}

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