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Java Polymorphism
Polymorphism means having more than one forms. You will learn about it in three chapters namely Method Overloading, Constructor Overloading, and Method Overriding
Types of Polymorphism
There are the following two types of polymorphism available in Java:
- Overloading
- Overriding
Java Polymorphism Example
Here is an example program, helps in understanding the polymorphism in Java:
/* Java Polymorphism - Example Program */ class MyClassA { void myMethod() { System.out.println("Inside MyClassA's myMethod method"); } } class MyClassB extends MyClassA { void myMethod() { System.out.println("Inside MyClassB's myMethod method"); } } class MyClassC extends MyClassA { void myMethod() { System.out.println("Inside MyClassC's myMethod method"); } } class JavaPolymorphismTest { public static void main(String args[]) { MyClassA Aob = new MyClassA(); // object of type MyClassA MyClassB Bob = new MyClassB(); // object of type MyClassB MyClassC Cob = new MyClassC(); // object of type MyClassC MyClassA ref; // obtained a reference of type MyClassA ref = Aob; // ref refers to a MyClassA object ref.myMethod(); // calls MyClassA's version of myMethod() ref = Bob; // ref refers to a MyClassB object ref.myMethod(); // calls MyClassB's version of myMethod() ref = Cob; // ref refers to a MyClassC object ref.myMethod(); // calls MyClassC's version of myMethod() } }
Here is the sample output produced by the above Java program:
Inside MyClassA's myMethod method Inside MyClassB's myMethod method Inside MyClassC's myMethod method
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