Basic Concept of Interface in java

Interface is collection of abstract method.

Using the keyword interface,you can fully abstract a class interface from its implementation.

example of interface:

interface Callback
{
void callback(int p);
}




class Client implements Callback
{
public void callback(int p)
{
System.out.println("This is Client Interface " + p);
}

}

class Customer implements Callback
{
public void callback(int p)
{
System.out.println("This is Customer Interface " + p);
}

}

class Interface
{
public static void main(String args[])
{
Callback c = new Client();
c.callback(50);
Customer c1 = new Customer();
c = c1;
c.callback(100);
}

}