Solved

int representation of a string

Posted on 2006-07-09
4
247 Views
Last Modified: 2010-03-31
Hello experts,

I need to take a unique id which is a string and convert it into an integer. How can I do that and ensure the integer is also unique?

Cheers,
Matt.
0
Comment
Question by:mb2297
  • 2
  • 2
4 Comments
 
LVL 92

Expert Comment

by:objects
ID: 17070430
String sid = "123";
int id = Integer.parseInt(sid);

unique according to what exactly?
0
 

Author Comment

by:mb2297
ID: 17070449
Sorry, I should have said the String is alphanumeric - parseInt will throw a NumberFormatException in that case.

I'm basically trying to override Object's hashCode() function.

Each of my objects is a row in a table, so they have a row identifier (an int) and a table identifier (a String). I want to concatenate the two together to form an id which can uniquely id any row in any table.

However, hashCode() requires that you return an int - so I need to parse that unique alphanumeric id into a unique integer id.

Hope that makes sense. I should have been more clear, sorry.

Thanks,
Matt.
0
 
LVL 92

Accepted Solution

by:
objects earned 50 total points
ID: 17070461
return value from hashCode does not need to be unique.
you could just return the hashCode() of the concatenated string you have
0
 

Author Comment

by:mb2297
ID: 17070484
Hello again objects.

In the interest of HashMap efficiency, I would like the codes to be unique, and returning the code of the concatentated string works just fine.

Many thanks!
Matt.
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

An old method to applying the Singleton pattern in your Java code is to check if a static instance, defined in the same class that needs to be instantiated once and only once, is null and then create a new instance; otherwise, the pre-existing insta…
Introduction This article is the last of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers our test design approach and then goes through a simple test case example, how …
Viewers learn about the “for” loop and how it works in Java. By comparing it to the while loop learned before, viewers can make the transition easily. You will learn about the formatting of the for loop as we write a program that prints even numbers…
Viewers will learn how to properly install Eclipse with the necessary JDK, and will take a look at an introductory Java program. Download Eclipse installation zip file: Extract files from zip file: Download and install JDK 8: Open Eclipse and …

773 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question