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Practical-27

Write a java program which implements Interface.​

Introduction​

Java implements multiple Interfaces using inheritance to re-use code of several classes. An interface is a contract between the class and the outside world and Java requires that the class obeys the contract. Implementing an interface means that your class agrees to carry out a certain contract specified by the interface. In other words, it requires that your class must fulfill the promises or contracts made by the interface.

Code​

public interface InterfaceExample {
  void print();
  int add(int x, int y);
}
public class Demo implements InterfaceExample {
  public void print() {
    System.out.println("print method implementation");
  }
  public int add(int x, int y) {
      return x+y;
  }
}
public class Main {
  public static void main(String[] args) {
    Demo d = new Demo();
    d.print();
    int result = d.add(5, 7);
    System.out.println("Result = "+result);
  }
}

Output​

print method implementation
Result = 12
Explanation

The code implements the InterfaceExample interface by implementing its two methods. It then creates object of Demo class and calls the two methods associated with it.