Programming Forums - Keypress question from a somewhat new Java programmer

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Keypress question from a somewhat new Java programmer

Hi there...

I believe that my question is somewhat simple, but as my thread title suggests, I'm a little new at Java programming.

My problem is that I need to know how register keypresses somehow with Java. I plan to use this as a component of part of a senior project (which is basically a very simple music composition program which saves files in .mid format) for my computer science class which. This is the only component of the program so far that I havent had any progress in, and seeing as it's winter break now... I might as well use this time wisely.

All I need is to figure out how to do the following... in code of course:

If the a-key is pressed, perform action x.

I have read a little and heard about keypress listening, and code that sits in an seemingly-infinite loop that only terminates upon the press of a certain key, but I just don't know how to implement it.

Any help at all would be appreciated

Thanks :twisted:

Re: Keypress question from a somewhat new Java programmer

Well that's helpful... I swear I looked in .awt.

Thanks a lot andro, now I have something to go with!

(that doesnt mean I dont need any more advice haha)

Re: Keypress question from a somewhat new Java programmer

Some people also prefer to use the KeyAdaptor class as it doesn't require you to implement all the methods in the KeyListener interface.

Re: Keypress question from a somewhat new Java programmer

Here's some pseudocode I whipped up:

import java.io.InputStream;



public class Test {

   private InputStream stdin = System.in;



   public char get() {

      return (char) stdin.read();

   }



   public void loop() {

      while(true)

         if(get() == 'a')

            launchEvents();

   }



   /* Implement your code here */

   protected void launchEvents() { }



   public static void main(String[] argv) {

      loop();

   }

}

That is, if your using the console.
If you are using a GUI, then search KeyListener, addKeyListener, and KeyEvent.