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Java - implements Keyword

Generally, the Java implements keyword is used with classes to inherit the properties of an interface. Interfaces can never be extended by a class.

interface Animal {
}

class Mammal implements Animal {
}

public class Dog extends Mammal {
}

This section provides you a program that demonstrates the usage of the implements keyword.

In the given program, you have two classes namely Mammal and Dog. Mammal class is implementing an interface Animal.

Copy and paste the program in a file with name Dog.java.

interface Animal {
}

class Mammal implements Animal {
}

public class Dog extends Mammal {

   public static void main(String args[]) {
      Mammal m = new Mammal();
      Dog d = new Dog();

      System.out.println(m instanceof Animal);
      System.out.println(d instanceof Mammal);
   }
}

On executing the program, you will get the following result −

true
true

Following is another example, where we can use implements keyword to implement multiple interfaces in single class.

interface Animal {
}

interface CanMove {
}

class Mammal implements CanMove, Animal {
}

public class Dog extends Mammal {

   public static void main(String args[]) {
      Mammal m = new Mammal();
      Dog d = new Dog();

      System.out.println(m instanceof Animal);
      System.out.println(m instanceof CanMove);
      System.out.println(d instanceof Mammal);
   }
}

On executing the program, you will get the following result −

true
true
true

java_basic_syntax.htm

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