How do I get the index of an object in an ArrayList using only a property of the object?

Question

This is the ArrayList class, I am trying to get the index of the Account object by using only an Account Number. My Account Object consists of ((object)Customer, (double) Balance) and my Customer Object consists of ((object) Name, (String) actNum, (object) Address).

import java.util.ArrayList;

public class Database {

    //Instance Veriables
    private ArrayList<Account> list;  
    private Account account;
    private int index;
    private Boolean found;


    public Database()
    {
        list = new ArrayList<Account>();
    }

    public void addAccount(Account a)
    {
        list.add(a);
    }

    public void deleteAccount(int i)
    {
        list.remove(i);
    }

    public void searchAccount(String actNum)
    {

        this.found = list.contains(actNum);
        this.index = list.indexOf(actNum);
        this.account = list.get(0);
    }

    public int getIndex()
    {
        return index;
    }

    public Account getAccount()
    {
        return account;
    }

    public Boolean isInList()
    {
        return found;
    }

}

sprinter · Accepted Answer · 2015-02-02 01:26:29Z

2

private int indexForAccountWithNum(String searchActNum) {
    for (int i = 0; i < list.size(); i++)
        if (list.get(i).getCustomer().getAccountNum() == searchActNum)
            return i;
    return -1;
}

Or in Java 8

IntStream.range(0, list.size())
    .filter(i -> list.get(i).getCustomer().getAccountNum() == searchActNum)
    .findFirst().orElse(-1);

edited Feb 2, 2015 at 1:26

answered Feb 2, 2015 at 1:07

sprinter

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2 Comments

David Schiumerini Over a year ago

The thing is is that the accountNum isnt even in the Account class, it's in another sub-class called Customer. So it's like to classes deep and it keeps getting errors

sprinter Over a year ago

I've added a getCustomer call. If you are getting errors your'll need to post the errors and any details of code triggering them.

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