Polymorphism

[Anonymous]

Hi all,
Could someone explain the Polymorphism to me with some examples?
I really want to know the definition of Polymorphism and how we can use it.
Thank you in advance.
Mike

[Madhav Lakkapragada]

Def.:
ability of an obj to respond to a message in a
manner appropriate to its type.
Ex: In this example, you could see which method
gets called. The method of the class to which
the object belongs to gets called.

public class StaticInner {

public static void main (String a[]) {

StaticInner sIn = new StaticInnerDerived();
// sIn is a reference of type StaticInner
// so at compile time, JVM is happy and thinks
// it will invoke the go() from Super class.
// However, at runtime, sIn refers to an obj
// of type StaticInnerDerived. the net result is
// that the go() from the StaticInnerDerived class
// is called.
sIn.go();

// On the other hand......
System.out.println(" ");

}

public void go() {
System.out.println ("Go of the Super Class");
}
}
class StaticInnerDerived extends StaticInner {
public void go() {
System.out.println ("Go of the Derived Class");
}
}

If you are familiar with C++ the same is achieved
using the keyword virtual.
Regds.
- satya

[thejus/mahesh]

hi mike
polymorphism is a oops concept where function/object act differently according to the situations
for example
add(int a,int b);
add(int a,float b);
add(double d,double x);
see here add function will act differently according to the parametes passed to the add function
this is checked only during runtime. it is taken care by jvm
this in brief polymorphism
hope i am clear if not please get back
regds
thejus/mahesh

[Netla Reddy]

Hi All,
Polymorphism:One or more object act diferently for same message.
Take one real world example
Suppose one Car (Car Object) , one Cycle (One more object) are running on the road and they reached a signal and with red sign both object will stop.
Here both objects are stopped for one message but the mechanism is different.
I hope it is clear for you.............

Please notice that there are two types of Polymorphism Viz
1) Static Polymorphism and Dynamic Polymorphism or
2) True Polymorphism or False Polymorphism or
4) Compile Polymorphism or Runtime Polymorphism