abstract class vs interface with example

A class that implements an interface need to implement all the abstract methods ▻ For example, we can define Orange and Chicken classes that implement 

How to write a class that implements an interface using the keyword otherwise it must be an “abstract” class (more later) Interface Example: Iterator

Interface example public interface Comparable{ public int compareTo(T o); } public class Name implements Comparable{ public int 

public abstract class MyClass { // data members interface must implement/ define all methods declared in the interface instanceof Example public class Lion 

Abstract class: incomplete class, useless by itself, meant for use as a Interface: a special limited kind of abstract class Real-Life Example (simplified)

An abstract class that implements an interface might map the interface methods onto abstract methods For example: In this example, the class DerivedClass is 

An abstract class in a class hierarchy represents a generic concept • Common elements in An interface establishes a set of methods that a class will implement • Similar to Example: a method to compute the average of an array of Objects

Class Invariant: All objects have a name string and hire date For example, perhaps the HourlyEmployee class All of the methods in an interface are abstract