Answer Posted / anjani kumar jha

Java supports two types of polymorphism
1)compile time
2)Run time

1)Compile:---overloading is the best example of compile-
time polymorphism.
Look at this example:----

class NewClass {

public void aSum()
{
System.out.println("hi.......");
}
// NewClass nc1=new InheritClass();
// NewClass nc=new NewClass();
}
class InheritClass extends NewClass
{
@Override
public void aSum()
{
System.out.println("over-riden......");
}
public static void main(String as[])
{
NewClass nc=new NewClass();
NewClass nc1=new InheritClass();

nc.aSum();.......compile time polymorphism
reference type determine which method to be invoke
//nc1.aSum();
}




2)Run time:Over-ridding is the example of run time
polymorphism........

look at example----
class NewClass {

public void aSum()
{
System.out.println("hi.......");
}
// NewClass nc1=new InheritClass();
// NewClass nc=new NewClass();
}
class InheritClass extends NewClass
{
@Override
public void aSum()
{
System.out.println("over-riden......");
}
public static void main(String as[])
{
NewClass nc=new NewClass();
NewClass nc1=new InheritClass();

// nc.aSum();
nc1.aSum(); //object type determine which method
shuold call
//run the example u will get idea about that
}
}
}

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Question: Implement a base class Appointment and derived classes Onetime, Daily, Weekly, and Monthly. An appointment has a description (for example, “see the dentist”) and a date and time. Write a virtual function occurs_on(int year, int month, int day) that checks whether the appointment occurs on that date. For example, for a monthly appointment, you must check whether the day of the month matches. Then fill a vector of Appointment* with a mixture of appointments. Have the user enter a date and print out all appointments that happen on that date.

1316

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