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import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
- Classes and Objects: Define a class to create objects that have properties and behavior.
- Inheritance: Create a subclass that inherits properties and behavior from a parent class.
- Polymorphism: Use method overriding or method overloading to achieve multiple forms of a method.
- Abstraction: Define an abstract class or interface to provide a partial implementation.