What is Polymorphism in Java | Java OOPs Concepts

Polymorphism in Java: – Here Develop A Feature Such that it Takes More than One Form Depending on The Situation. Polymorphism is Applicable Only On Methods. it Can Not be applied On Variable.

Polymorphism in Java

There are Two Ways We Can Access Polymorphism.

1. Overriding
2. Overloading

Overriding Polymorphism in Java With Example

Overriding: – Here We inherit A Method than We Modify the Logic of the inherited Method of a Child Class by Ones Again Creating A Method in a Child Class With the Same Signature.

Example 1

public class A   {
public void test()  {
System.out.println(100);
}
}

public class B extends A   {
@Override
public void test() {
System.out.println(200);
}
public static void main( String[] args )  {
B b1 = new B();
b1.test();
}
}

Output : 500

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• What is Abstract Class in Java
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• Types of Exceptions in Java
• What is inheritance in Java
• What is Final Keyword in Java
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• What is Wrapper Class in Java
• Break Keyword in Java with Example
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Note 1: Override Annotation Will instruct the Compiler to Check Whether Overring is Happening or not. if Overring does not Happen they will give you an error As shown in Below Example.

public class A  {
public void test() {
	System.out.println(10);
}
}
public class B extends A{
	@Override
	public void tests() {    // Error
	System.out.println(20);	
	}
	public static void main(String[] args) {
		B b1 = new B();
		b1.test();
	}
}

Output : 10

Example 2

public class A  {
public void test() {
	System.out.println(10);
}
}
public class B extends A{
	@Override
	public void test() {   
	System.out.println(20);	
	}
	public static void main(String[] args) {
		B b1 = new B();
		b1.test();
	}
}

Output : 20

Example 3 Overriding

public class GoldAccount {
public void onlineBanking() {
	System.out.println("Milega");
	}
public void cheqBook() {
	System.out.println("nahi Milega");
	}
public void rateOfIntrest() {
	System.out.println("4%");
	}
}


public class PlatinumAccount extends GoldAccount{
	@Override
		public void cheqBook() {
			System.out.println("Free");
			
		}
	@Override
	public void onlineBanking() {
		System.out.println("No");
		
	}
public static void main(String[] args) {
	GoldAccount g = new GoldAccount();
	g.onlineBanking();
	g.cheqBook();
	g.rateOfIntrest();
	PlatinumAccount p =new PlatinumAccount();
	p.onlineBanking();
	p.cheqBook();
	p.rateOfIntrest();
	}

 
}

Output : 
Milega
nahi Milega
4%
No
Free
4%

Overloading Polymorphism in Java With Example

Overloading: – Here We Create A Method With The Same Name in the Same Class More than Ones by giving Different Numbers of Arguments or Different Types of Arguments.

Example 1

public class A  {
public void test() {
	System.out.println(10);
}
public void test(int x) {
	System.out.println(x);	
}
public static void main(String[] args) {
	A a1 = new A();
	a1.test();
	a1.test(20);
}
}

Output : 
10
20