Interfaces

An interface describes what functions an implemented class will have to code. E.g. if a class was a car and the interface had functions for how many doors etc, then a class of Vauxhall that implements the interface would have to code the function to return the correct amount of doors.

Here is the code, I usually find the code explains it better.

// defines the fuctions that have to be implemented by a implementable class
interface implementThese
{
       void printHi();       // have to implement these
       void printBye();
}

// the interClass will implement the interface implementThese
class interClass implements implementThese
{
       public void printHi()
       {
              System.out.println("Hi");
       }

       public void printBye()
       {
              System.out.println("Bye");
       }
}

class inter
{
       public static void main(String args[])
       {
              interClass in = new interClass();
              // call the classes functions.
              in.printHi();
              in.printBye();
       }
}

If you save as inter.java, and then run the output will be

Hi
Bye

There can be many interfaces per class to be implemented.