How to use variables in Interfaces (Java Programming)

An interface can contain constants (final variables). A class that implements an interface containing constants can use them as if they were declared in the class. Example demonstrating constants in an interface is given below: IArea.java (interface) 1 2 3 4 public interface IArea { double PI = 3.142; }   Driver.java (Main program which implements the above interface) 1 2 3 4 5 6 7 public class Driver implements IArea { public static void main(String args) { System.out.println(“PI value is: “ + PI); } } In the above code the class Driver.java implements the interface IArea and prints the value of the

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How to use variables in Interfaces (Java Programming)
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