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polymorphism

Polymorphism: Polymorphism refers to the ability of OOPs programming languages to differentiate between entities with the same name efficiently. This is done by Java with the help of the signature and declaration of these entities.
For Example:

// Java program to demonstrate Polymorphism

// This class will contain
// 3 methods with same name,
// yet the program will
// compile & run successfully
public class Sum {

// Overloaded sum().
// This sum takes two int parameters
public int sum(int x, int y)
{
return (x + y);
}

// Overloaded sum().
// This sum takes three int parameters
public int sum(int x, int y, int z)
{
return (x + y + z);
}

// Overloaded sum().
// This sum takes two double parameters
public double sum(double x, double y)
{
return (x + y);
}

// Driver code
public static void main(String args[])
{
Sum s = new Sum();
System.out.println(s.sum(10, 20));
System.out.println(s.sum(10, 20, 30));
System.out.println(s.sum(10.5, 20.5));
}
}

Output:
30
60
31.0
Polymorphism in Java are mainly of 2 types:

1.Overloading in Java
2.Overriding in Java

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