How do I create an unlimited number of unique objects in java?

Question

0.00/5 (No votes)

See more:

Hi I'm working on a Java project and I'm wanting the user to enter details about their city.
To do this I have a city class and have the user enter it the values for it's attributes.

The only problem is I'm not sure how to make each instance unique, meaning it has a different name.
Will iterating the name of the new Object instance work?

What I have tried:

I've tried iterating the name of the new Object instance as it will be the same as the previous instance.

I've tried creating a Object Factory.

Posted 8-Sep-22 4:27am

daniel wakeley

Updated 8-Sep-22 5:10am

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Accepted Answer · 2022-09-08T05:10:00

Solution 1

Unless you are creating a small and specific number of instances at compile time, you don't want to "name" them as separate variables.

Instead use a collection: an ArrayList is probably the most basic, or you could use a HashMap and use the Key for the "name" (since city names have to be unique that would work pretty well).

See here for some ideas: Collections in Java - GeeksforGeeks[^]

Posted 8-Sep-22 5:10am

OriginalGriff

Comments

daniel wakeley 8-Sep-22 12:21pm

Thank you so much Sir, I've been trying for a solution for a while now. I'll add them to a HashMap to give them a unique identifier.
I hope you have a great weekend!

OriginalGriff 8-Sep-22 12:35pm

You're welcome!