InterfaceDemo2.java

//Interface Constants
import java.util.Random;
interface SharedConstants{
	int NO=0;
	int YES=1;
	int MAYBE=2;
	int LATER=3;
	int SOON=4;
	int NEVER=5;
}
class Question implements SharedConstants{
	Random rand = new Random();
	int ask(){
		Double a=rand.nextDouble();
		System.out.print(a+"\t");
		int prob = (int) (100* a);
		if(prob<30)
			return NO;
		else if(prob<60)
			return YES;
		else if(prob<75)
			return LATER;
		else if(prob<98)
			return SOON;
		else
			return NEVER;
	}
}
public class InterfaceDemo2 implements SharedConstants{
	static void answer(int result){
		switch(result){
		case NO:	System.out.println("NO");	break;
		case YES:	System.out.println("YES");	break;
		case MAYBE:	System.out.println("MAYBE");break;
		case LATER: System.out.println("LATER");break;
		case SOON:	System.out.println("SOON");	break;
		case NEVER:	System.out.println("NEVER");break;
		default:	System.out.println("Wrong Answer");
		}
	}
	public static void main(String args[]){
		Question q = new Question();
		answer(q.ask());
		answer(q.ask());
		answer(q.ask());
		answer(q.ask());
	}
}