Runtime polymorphism in Java
Runtime Polymorphism in Java
When a child class extends a parent class then all of its variable and methods is accessible in the child class. But when the child class overrides one of the method of the parent class , then during the run time the method of the child class is called rather than the parent class, this is decided in the run time and not in the compile time, so this is referred as Dynamic method dispatch.
Example
class Animal{ public void run()
{ System.out.println("Animals can run");
}} class Deer extends Animal {
public void run() {
System.out.println("Deer can run faster than other animals"); }}
public class TestDeer
{ public static void main(String args[])
{ Animal a = new Animal();
// Animal reference and object Animal b = new Deer();
// Animal reference but Deer object a.run();
// runs the method in Animal class b.run();
// runs the method in Deer class }}
|
Output
| Animals can run
Deer can run faster than other animals |
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