Abstraction
Abstraction: Definition : Abstraction involves modeling classes based on essential attributes and behaviors, ignoring unnecessary details. Explanation : Abstract classes can't be instantiated and provide a blueprint for subclasses. Interfaces define method signatures that implementing classes must provide. Example: abstract class Shape { abstract void draw(); } class Circle extends Shape { @Override void draw() { System. out .println( "Drawing a circle." ); } } class Square extends Shape { @Override void draw() { System. out .println( "Drawing a square." ); } } public class Main { public stati...