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 Polymorphism is a concept in object-oriented programming that allows objects of different classes to be treated as if they were objects of the same class. It allows a single method or operation to have different meanings or behaviors based on the context in which it is used. In Java, there are two types of polymorphism: Compile-time Polymorphism: This is achieved through method overloading, where two or more methods in a class have the same name but different parameters. Runtime Polymorphism: This is achieved through method overriding, where a subclass provides its own implementation of a method that is already defined in its parent class. Here is an example of method overloading: class MyClass {    public int sum(int a, int b) {       return a + b;    }    public double sum(double a, double b) {       return a + b;    } } public class Main {    public static void main(String[] args) {     ...