Java Wrapper Classes: Using the equals Method for Object Comparison | Java Tutorial

In this Java tutorial, we delve into the intricacies of the "equals" method in wrapper classes. The "equals" method is used for comparing objects in Java, determining whether two objects are considered equal based on specific criteria.

In wrapper classes, such as Integer, Double, Boolean, etc., the "equals" method is particularly important for object comparison. We'll explore how this method works, what it compares, and how to override it effectively.

Key topics covered in this tutorial:
- Understanding the purpose of the "equals" method in Java wrapper classes
- How to use the "equals" method for comparing wrapper class objects
- Differences between reference equality and value equality in Java
- Implementing custom equality checks by overriding the "equals" method
- Best practices and considerations when using the "equals" method in Java

By the end of this tutorial, you'll have a solid understanding of how to leverage the "equals" method effectively with Java wrapper classes, enabling you to perform accurate and meaningful object comparisons in your Java programs.

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Java wrapper class (equals method) | Java Tutorial

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Determines if two wrapper class objects "of the same type" are equal or not. Every word you write on the screen shows this, but in the audio you don't emphasize it, and some people learn mostly by listening. It is important to remember that if the Wrapper types are not the same, .equals() always returns false, no matter what the values are:
jshell> Integer iz = 0
iz ==> 0

jshell> Short sz = 0
sz ==> 0

jshell> iz.equals( sz )
$38 ==> false

jshell> iz.compareTo( sz )
| Error:
| incompatible types: java.lang.Short cannot be converted to java.lang.Integer
| iz.compareTo( sz )
| ^^

jshell> iz.compareTo( (Integer)sz )
| Error:
| incompatible types: java.lang.Short cannot be converted to java.lang.Integer
| iz.compareTo( (Integer)sz )
| ^^
jshell> iz == sz
| Error:
| incomparable types: java.lang.Integer and java.lang.Short
| iz == sz
|

jshell> iz.intValue() == sz.intValue()
$39 ==> true
// Finally success!!!!
Great video, but since there were no comments, I figured I might add a little warning to the unwary who were listening more than they were reading!