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Helper Class
A class that provides additional functionality or utility methods, designed to assist in the operations of another class or classes.
Interface
In programming, a contract or a set of methods that a class can implement to agree to behave in a certain way.
Extends
A keyword in Java and other programming languages used to inherit properties and methods from one class to another.
Implements
A keyword in many programming languages used to specify that a class is going to use the interface(s) declared methods.
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