Inheritance

Inheritance:
Inheritance can be defined as the process where one object acquires the properties of another. 
use extends or implements..interface not extended, it should be implemented

public class Animal{
}

public class Mammal extends Animal{
}

public class Reptile extends Animal{
}

public class Dog extends Mammal{

Example:
public interface Animal {}

public class Mammal implements Animal{
}

public class Dog extends Mammal{

public interface Vegetarian{}
public class Animal{}
public class Deer extends Animal implements Vegetarian{}