How do I exit a while loop by pressing enter?

Question

I am trying to get a while loop to break by pressing the Enter key on a keyboard. My code is:

package javaapplication4;
import java.util.ArrayList         


        

Answer 1

I myself like to use try { ... } catch (NumberFormatException) so when you get a blank line (ie enter) your catch block is activated and you've escaped the loop

try {
    while (true) {
      System.out.println("Please enter the numbers seperated by a space: ");
      numbers.add(keyboard.nextDouble());
      //want the while loop to break here by pressing "enter" after entering array values
    }
} catch (NumberFormatException ex) {}
System.out.println(numbers);