Solved

Comparing objects?

Posted on 1998-10-20
1
181 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
1 Comment
 
LVL 2

Accepted Solution

by:
mwibbels earned 20 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

What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
JUnit 4 @Before and @BeforeClass differences 3 59
rhino JavaScript import, load 25 84
runtime exception 2 28
mysql jsp example issue 32 37
Introduction Java can be integrated with native programs using an interface called JNI(Java Native Interface). Native programs are programs which can directly run on the processor. JNI is simply a naming and calling convention so that the JVM (Java…
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
Viewers learn about the scanner class in this video and are introduced to receiving user input for their programs. Additionally, objects, conditional statements, and loops are used to help reinforce the concepts. Introduce Scanner class: Importing…
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 …

777 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