Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Comparing objects?

Posted on 1998-10-20
1
Medium Priority
?
187 Views
Last Modified: 2010-03-30
Is there any method that allows you to compare objects to see if they are equal???

0
Comment
Question by:wazila
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 
LVL 2

Accepted Solution

by:
mwibbels earned 80 total points
ID: 1226001
Every object has a method equals(Object o) which checks if two objects are equal, so a.equals(b) returns true if a equals b. You can override this method (as has been done in the String class) to let your own classes compare.

Keep in mind that, for Strings a and b, the expression "a.equals(b)" is not the same as "a==b": the first compares the contents of two strings, the second compares their references.

Most overrides of "equals" first check if both objects are instances of the same class and then compare their contents.

Also check the Object and String documentation of the "equals" method.
0

Featured Post

Build and deliver software with DevOps

A digital transformation requires faster time to market, shorter software development lifecycles, and the ability to adapt rapidly to changing customer demands. DevOps provides the solution.

Question has a verified solution.

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

Java contains several comparison operators (e.g., <, <=, >, >=, ==, !=) that allow you to compare primitive values. However, these operators cannot be used to compare the contents of objects. Interface Comparable is used to allow objects of a cl…
Are you developing a Java application and want to create Excel Spreadsheets? You have come to the right place, this article will describe how you can create Excel Spreadsheets from a Java Application. For the purposes of this article, I will be u…
Video by: Michael
Viewers learn about how to reduce the potential repetitiveness of coding in main by developing methods to perform specific tasks for their program. Additionally, objects are introduced for the purpose of learning how to call methods in Java. Define …
This tutorial covers a step-by-step guide to install VisualVM launcher in eclipse.
Suggested Courses

688 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