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Thread: Loop ending with ESC button

  1. #1
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    Default 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


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    Default Re: Loop ending with ESC button

    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.

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    Default Re: Loop ending with ESC button

    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.

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