INTERVIEW QUESTIONS J2EE JAVA DETAILS

Question: What is runtime polimorphism? give an example program ?

Answer: Runtime polymorphism is the concept of identifying the object
reference at run time.This is also called as Late/Dynamic Binding in C++.

The following example explains you how it works.

class SuperHandler {
public String handleRequest() {
return null;
}
}

class ReservationHandler extends SuperHandler
{
public String handleRequest() {
//Implement your Reservation functionality here.
return "Hi, I am responsible for Reservation"; // output 1
}
}

class CancellationHandler extends SuperHandler {
public String handleRequest() {
//Implement your cancellation functionality here.
return "Hi, I am responsible for Cancellation"; // output 2
}
}

public class Client {
public static void main(String arg[]) {
String handlerString = arg[0];
SuperHandler handler = null; // Note 1
if(handlerString.equals("reserve")) {
handler = new ReservationHandler(); // Note 2
} else if(handlerString.equals("cancel")) {
handler = new CancellationHandler(); // Note 3
}
System.out.println(handler.handleRequest()); // Note 4
}
}

Runtime polymorphism is the concept of identifying the object
reference at run time.This is also called as Late/Dynamic Binding in C++.

The following example explains you how it works.

class SuperHandler {
public String handleRequest() {
return null;
}
}

class ReservationHandler extends SuperHandler
{
public String handleRequest() {
//Implement your Reservation functionality here.
return "Hi, I am responsible for Reservation"; // output 1
}
}

class CancellationHandler extends SuperHandler {
public String handleRequest() {
//Implement your cancellation functionality here.
return "Hi, I am responsible for Cancellation"; // output 2
}
}

public class Client {
public static void main(String arg[]) {
String handlerString = arg[0];
SuperHandler handler = null; // Note 1
if(handlerString.equals("reserve")) {
handler = new ReservationHandler(); // Note 2
} else if(handlerString.equals("cancel")) {
handler = new CancellationHandler(); // Note 3
}
System.out.println(handler.handleRequest()); // Note 4
}
}

Source: CoolInterview.com

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