Top "Equals" questions

What's the best strategy for Equals and GetHashCode?

I'm working with a domain model and was thinking about the various ways that we have to implement these two …

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Best practices regarding equals: to overload or not to overload?

Consider the following snippet: import java.util.*; public class EqualsOverload { public static void main(String[] args) { class Thing { final int …

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How to compare two jsons ignoring order of elements in array properties?

I need to compare two strings which represent json objects. For testing purposes I need a way to compare these …

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Is there a way to auto-generate GetHashCode and Equals with ReSharper?

In eclipse, when I code in Java, there is a feature to auto-generate a basic, efficient, and bug free implementation …

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Equals and Comparable with Sets

I posted some code here which correctly solved a problem the poster had. OP wanted to remove duplicates and bring …

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What is the difference between using IEqualityComparer and Equals/GethashCode Override?

When i am using dictionaries sometimes I have to change the default Equals meaning in order to compare Keys. I …

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List.contains() fails while .equals() works

I have an ArrayList of Test objects, which use a string as the equivalency check. I want to be able …

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How to compare equality of lists of arrays with modern Java?

I have two lists of arrays. How do I easily compare equality of these with Java 8 and its features, without …

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What makes reference comparison (==) work for some strings in Java?

I have following lines of codes to compare String. str1 not equal to str2, which is understandable since it compares …

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What does comparison being consistent with equals mean ? What can possibly happen if my class doesn't follow this principle?

From the JavaDoc of TreeMap : Note that the ordering maintained by a sorted map (whether or not an explicit comparator …

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