We're grappling with how to implement equals()/hashCode() on our persistent

Aug 7, 2009 . In Relational database's this is done with primary keys, in Java we have equals()

Explains what to be aware of, when implementing hashCode() and equals() in

MrBool Java - This video demonstrates the use of the methods equals and

[How-To] Override equals() and hashCode(). Part 1. Apr 27, 2006 · Add

Commons Lang EqualsBuilder and HashCodeBuilder provide methods to

Feb 14, 2011 . The dreaded equals() and hashcode(). Today I finally got to the bottom of a bug

Jan 26, 2010 . I came across this issue a couple years ago. It was surprisingly not-so-obvious to

Oct 15, 2007 . Overriding the equals and hashCode methods. Get Java help and support on

Note how it says that the value returned from hashCode must be the same in the

Guide to making your class compatible with Java hash maps by overriding the

Sep 12, 2011 . Java objects are expected to obey a number of invariants related to equality. One

of its nonfinal methods (equals, hashCode, toString, clone, and finalize) have

Aug 26, 2008 . up vote 130 down vote favorite. 110. share [fb] share [tw]. What issues / pitfalls

Aug 1, 2010 . if a class overrides equals, it must override hashCode; when they are both

Have you ever thought that your Class may not implement the equals and

. of elements e1 and e2 such that e1.equals(e2) , and at most one null element.

If two objects are equal according to the equals(Object) method, then calling the

Code | Generate | context menu | equals() and hashCode() Alt+InsertCommand

May 15, 2010 . In one of my current consulting projects the topic of implementing equals and

EqualsVerifier can be used in Java unit tests to verify whether the contract for the

Jul 19, 2009 . All java programmers must provide meaningful overrides for the equals and

Feb 7, 2008 . Equals & Hash Code relationship - The last note from the API documentation is

Jul 7, 2011 . قبل الدخول في هياكل بيانات جافا يجب على المبرمج الإلمام بكتابة العمليات Object.

Override both public boolean Object.equals(Object other), and public int Object.

Options for handling equals() and hashcode() implementation.

hashCode() is a method that we override in our custom classes and its

Aug 24, 2009 . “You must override hashCode in every class that overrides equals. Failure to do

Aug 21, 2007 . hashCode(); equals(). These methods are available in the Object class and

Aug 8, 2008 . HashCode and Equals method in Java object – A pragmatic . Now I will explain

Feb 23, 2011 . equals and hashcode are most important method of Java object class and at the

When you mix instances retrieved in different sessions, you must implement

If you override the equals(), you MUST also override hashCode(). Otherwise a

Aug 24, 2010 . Generating correct equals and hashCode methods is hard. There's an entire

Implementing equals() and hashCode(). You have to override the equals() and

Feb 12, 2009 . Object class provides two methods hashcode() and equals() to represent the

Grails is a high-productivity web framework based on the Groovy language that

bags/idbags behave in inconsistent way in comparison to set/list/map in respect

Jan 15, 2001 . In order for the Java Collections to work properly (and everything else in Java),

Equal hashCodes in general are not sufficient to ensure Object equality.

Apr 11, 2011 . Although there are lots of material are available on internet and API document

Java @ DaniWeb - I have a Coin class that compares weight and value and I

Jan 7, 2011 . Java Object class allows you to override equals & hashcode methods based on

Any class definition may be annotated with @EqualsAndHashCode to let lombok

By definition, if two objects are equal, their hash code must also be equal. If you

Jan 1, 1999 . Next, I'll consider equals and hashCode together. . Erroneous implementations

Hibernate guarantees equivalence of persistent identity (database row) and Java

In the Java programming language, every class must provide a hashCode()

Derived classes that override GetHashCode must also override Equals to

I have this test code: import java.util.*; class MapEQ { public static void . You

Sitemap