Java Printing Hashcode instead of Content-CodePudding

I am trying to iterate inside some arrays containing the name, last name, id and the score of some student. I have to sort this array in descending format. I have used comparable function and compare the elements according to their scores. This is my code: `

import java.util.Arrays;
import java.util.Scanner;
import java.util.*;
public class Main {
    private static class Student {
        String fName; // First Name
        String lName; // Last Name
        int id; // Student ID
        int score; // Score

        public Student(String fName, String lName, int id, int score) {
            this.fName = fName;
            this.lName = lName;
            this.id = id;
            this.score = score;
        }
            public int getScore() {
                return score;
            }
        }


//      Checking if Alphabetic or not
    public static boolean alphabetic(String str) {
        char[] charArray = str.toCharArray();
        for (char c : charArray) {
            if (!Character.isLetter(c))
                return false;
        }
        return true;
    }


    public static void main(String[] args) {
        System.out.println("Enter the number of students");
        Scanner input = new Scanner(System.in);
        int k = input.nextInt(); // number of students
        Student[] students = new Student[k];
        for (int i = 0; i < k; ) {
            System.out.println("Enter id");
            int id = input.nextInt();
            System.out.println("Enter first name ");
            String fName = input.next();
            while (alphabetic(fName)== false){
                System.out.println("Wrong! Please enter again ");
            }
            System.out.println("Enter last name ");
            String lName= input.next();
            while (alphabetic(lName)==false) {
                System.out.println("Wrong! Please enter again ");
            }
            System.out.println("Enter score ");
            int score = input.nextInt();

            students[i  ] = new Student(fName, lName, id, score);

        }

         class ByScoreComparator implements Comparator<Student> {
            @Override public int compare(Student s1, Student s2) {
                return Integer.compare(s1.getScore(), s2.getScore());
            }
        }
        Arrays.sort(students, new ByScoreComparator());
        System.out.println(Arrays.toString(students));

I know that for changing the hashcode, I have to use toString() method but even though I use this method, I still get the hashcodes instead of the values. Can you please help me?

CodePudding user response：

When you use toString() method for an Object you should redefine it at the Object class.

So, you need to add this part of code at Student Class :

@Override
    public String toString(){
        return "id: " this.id   " "   "fName: "   this.fName   " "   "lName: "   this.lName   " "   "score: "   this.score;
    }

And the result is printed as needed :

[id: 2 fName: Lee lName: Jen score: 600, id: 1 fName: Mo lName: Nee score: 900]