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. |
- Tutorials