如何在java hashset中打印类的对象？

Question

我正在尝试创建一个类的对象并尝试将其存储在工作正常的哈希集中。但是当我尝试打印它时，它显示了一些奇怪的值，例如“com.hashset2.java.Driver$TemplateSet@30f39991”。在调试控制台中，我看到值插入正确。这是我的代码：

package com.hashset.java;

import java.util.HashSet;
import java.util.Scanner;

public class Driver {

public static void main(String[] args) {

    HashSet<TemplateSet> numberSet = new HashSet<TemplateSet>();

    Scanner scanner = new Scanner(System.in);

    int n = scanner.nextInt();

    for (int i = 0; i < n; i++)
    {
        int a, b;

        a = scanner.nextInt();
        b = scanner.nextInt();

        numberSet.add(new TemplateSet(a, b));
    }
}

public static class TemplateSet {

    int n1, n2;

    TemplateSet(int num1, int num2)
    {
        this.n1 = num1;
        this.n2 = num2;
    }
 }
}

这是一个示例输出 在此处输入图片说明

Answer 1

public static class TemplateSet {

    int n1, n2;

    TemplateSet(int num1, int num2)
    {
        this.n1 = num1;
        this.n2 = num2;
    }

 //The toString() method is used by your print statement to convert Object to String format
  @Override
  public String toString()
  {
    return n1+","+n2;
  }
 }

Answer 2

// Java program to print the elements
// of HashSet using iterator cursor

import java.util.*;

class GFG {
    public static void main(String[] args)
    {

        HashSet<Integer> hs = new HashSet<Integer>();
        hs.add(5);
        hs.add(2);
        hs.add(3);
        hs.add(6);
        hs.add(null);

        // print HashSet elements one by one.
        // Inserton order in not preserved and it is based
        // on hash code of objects.

        // creates Iterator oblect.
        Iterator itr = hs.iterator();

        // check element is present or not. if not loop will
        // break.
        while (itr.hasNext()) {
            System.out.println(itr.next());
        }
    }
}