Why?????

Question

import java.util.Scanner;
public class mainNim {

static void winningOrLosingStragetyInNim () {
Scanner X = new Scanner(System.in);

System.out.println("Please enter how many heaps there are");

int Heaps = X.nextInt();
int[] heapStacks = new int[Heaps];
System.out.println("You entered " + heapStacks.length);
System.out.println ("Would you like to continue?");
System.out.println("Please write \"yes\" if you would like to continue ");
System.out.println("E

Answer 1

Sololearn's playground takes all input at once,it cannot take input at runtime sorry

Answer 2

@yerucham I used eclipse to run the program, but it doesn't wan't to run properly in eclipse. I forgot to mention that at the time I posted my question.
@Jamie ok I'll do that in the future.

Answer 3

import java.util.Scanner;
public class mainNim {

static void winningOrLosingStragetyInNim () {
Scanner X = new Scanner(System.in);
Scanner D = new Scanner(System.in);
System.out.println("Please enter how many heaps there are");

int Heaps = X.nextInt();
int[] heapStacks = new int[Heaps];
System.out.println("You entered " + heapStacks.length);
System.out.println ("Would you like to continue?");
System.out.println("Please write \"yes\" if you would like to continue ");
System.out.println("Enter \"no\" if you would like to start over");
String continue1 = X.nextLine();
while (!continue1.equals("yes")) {

switch(continue1) {
case "no":
winningOrLosingStragetyInNim();
break;
default:
System.out.println("Please enter a valid option. You entered" + continue1);
System.out.println("Please write \"yes\" if you would like to continue. Enter \"no\" if you would like to start over");
continue1 = D.nextLine();
}

}
}

public static void main(String[ ] args) {

winningOrLosingStragetyInNim();
}
}