Java printing Arraylist

Question

These are my 2 classes, they work. I want to add Member into the ArrayList of Lan. My problem is, I can't seem to print out the members that are set in the ArrayList of Lan, the name and alias or just the name. when I print this comes: Member@1279d2f, any ideas? :S

import java.util.ArrayList;

public class Lan
{

private ArrayList<Member> members;



    public Lan()
    {
      members = new ArrayList<Member>();

    }

    public void addMember(Member newMember)
    {
        if(newMember.getBalance() >= 200)
        {
            this.members.add(newMember);
        }
        else
        {
            System.out.println("You dont have enough money to enter");
        }

    }
   public void printMembers(){

       System.out.println("People attending");
       for(Member member : members){

          System.out.println(member);
       }

   }

}


public class Member
{

    private String name;
    private String alias;
    private int balance;


    public Member(String fullName, String nickname)
    {
        this.name = fullName;
        this.alias = nickname;
        this.balance = 0;
    }
    public void setBalance(int account)
    {
        if(account > 0)
        {
            balance = balance + account;
        }
        else
        {
            System.out.println("You have not entered a valid number");
        }
    }

    public String getName()
    {
        return name;
    }
    public String getAlias()
    {
        return alias;
    }

    public int getBalance()
    {
        return balance;
    }
}

wadda_wadda · Accepted Answer · 2015-10-25 14:01:48Z

2

You must define a toString() method for your Member class:

public class Member { 

  private String name;
  private String alias;
  private int balance;


  public Member(String fullName, String nickname)
  {
      this.name = fullName;
      this.alias = nickname;
      this.balance = 0;
  }
  public void setBalance(int account)
  {
      if(account > 0)
      {
          balance = balance + account;
      }
      else
      {
          System.out.println("You have not entered a valid number");
      }
  }

  public String getName()
  {
      return name;
  }
  public String getAlias()
  {
      return alias;
  }

  public int getBalance()
  {
      return balance;
  }

  @Override
  public String toString() {
    return this.name + "\t" + this.balance;
  }

}

Without a toString() method for your custom class, you will print its location in memory. If there's other information you want to print in Member, modify the method that I've provided for you.

edited Oct 25, 2015 at 14:01

answered Oct 25, 2015 at 13:48

wadda_wadda

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4 Comments

Kayaman Over a year ago

Don't rely on it being its location in memory. While that was one of the implementations, it's not something you should assume is true.

pikkstup Over a year ago

When i compile i get missing return statement on the @Override public String toString() { System.out.println(this.name + "\t" + this.balance); }

pikkstup Over a year ago

Ahh, alright. In this case, because im returning both in a toString, should i just remove return balance / return name?

wadda_wadda Over a year ago

The 'toString()' method is just the standard textual representation of your class. If, for example, you wanted to represent your member as the name and alias, you would 'return this.name + " " + this.alias;'

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