Thread: Loop ending with ESC button

The whole idea is to end the loop with the ESC button.

import java.util.Scanner;
 
class Sum {
	public static void main(String[] args) {
		int sum = 0;
		System.out.println("Please write a number, end with ESC button");
		Scanner in = new Scanner(System.in);
		int number = in.nextInt();
 
		while (number != null ){
			sum += number;
			System.out.println("Please write a number, end with ESC button");
		} // end while
 
		System.out.println("The sumn is: "+ sum);
	} // end main
 
} // end Sum

As far as I know there is no way to get button events with a command-line program like this.
If I remember correctly certain operating systems only generate keyboard-events for programs that are executed in a window, so unless you create a JFrame (or use any other third party GUI library) you are out of luck.

What Cornix said. Well, to be exact, you *could* inject a hook to for example windows dll's and get an signal from key presses with JNI/JNA. I think SetWindowsHookEx function (Windows) would be the one for windows. But yea, thats getting quite complicated.