When we create a class that uses an interface, we use the keyword implements and the interface name in the class header. Interface provides an empty method header without any instruction within that method and it is the class which implements that interface responsibility to include instructions for that method. In below program I will show you how to write a simple class which implements an interface. First let us create an interface file.
public interface SingSongs {
public void sing();
}
Then create a class which will implement this interface with the interface method that print a line of output on the screen.
public class SingingBoy implements SingSongs {
public void sing() {
System.out.println("I am a real singing boy!");
}
}
Finally create a new instance of the above class and use that class method.
public class RealBoySings {
public static void main(String[] args) {
SingingBoy boy = new SingingBoy();
boy.sing();
}
}
Run the last java file and you should get below outcome:
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