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[M0NK3Y]

Interface class


An interface class is simple, it requires another class to provide specific methods.
For example, the comparable interface makes you provide a compareTo method. It provides classes to provide similiar behavior to other class that also implement a interface. So if you use foriegn class that implements comparable, you'll know that there is a compareTo method and it will be easy to figure the purpose of the class.

Example
public interface ClassInterface
{
void methodNameOne();
int methodNameTwo(int q);
}
public class ClassName implements ClassInterface
{
public void methodNameOne()
{
System.out.println("This is method one");
}
public int methodNameTwo(int q)
{
return 5+q;
}
} Note: All methods in a interface are public.
Abstract

An abstract class is really the mixture of an extension class and a interface. To learn more about extending class click here. Abstract classes have methods that it requires other classes to use, and it can provide methods for a class like extending it. You can of override the method in the class that uses the abstract class.
Example
public abstract class AbstractClass
{
public int number;

public AbstractClass(int theNumber)
{
number = theNumber;
}

public abstract void printSomething();

public void addFive()
{
number = number + 5;
}
}

public class ClassName extends AbstractClass
{
public int number;

public AbstractClass(int aNumber)
{
super(aNumber);
}

public abstract void printSomething()
{
System.out.println("q");
}

}
Basically this is a class extension except for the printSomething method. This is more like the interface class because it requires you to provide the method.
So a abstract class give you the best of extending classes and interfaces. You can require methods to provide methods even if you don't provide a base method in the abstract class (public abstract void printSomething(). It also lets you provide methods that the class that uses can access ( public AbstractClass(int theNumber) ). Remember, a class that uses 'extends' can only extend ONE class in java.

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