Bdtjtk

I am creating an Asteroids game and I need the up arrow, left arrow and spacebar to be detected when pressed. However, when I'm currently holding the arrow keys and press the spacebar, nothing happens and a little blue loading sign appears at my mouse-pointer. This leads me to believe that this is some sort of hotkey, because it works fine with the right arrow key. I'd appreciate an answer to guide me to the issue. I'm using java.awt.event.KeyListener to detect the keys. Thanks for your help!

I've tested this with the combination up arrow + right arrow + spacebar and it functions as it should. I googled the problem to no prevail. I just get problems people are having on Ubuntu, but I'm using Windows on a Lenovo Thinkpad.

@Override

public void keyPressed(KeyEvent e) {



    keys.add(e.getKeyCode());

}



@Override

public void keyReleased(KeyEvent e) {



    keys.remove(e.getKeyCode());

}



@Override

public void keyTyped(KeyEvent e) {



    if (e.getKeyChar() == ' ' && beams.size() < 5) {



            beams.add(new Beam((int)p.getPos().getX(), (int)p.getPos().getY(), p.getAngle()));

    }

}

I expect to see the keyTyped function called even after all the other keys are pressed. Instead I receive a loading sign followed by a faint and low 'bing' sound.

import java.awt.Color;

import java.awt.Graphics;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;



import javax.swing.JFrame;

import javax.swing.JPanel;



public class Example extends JPanel implements KeyListener {



    /**

     * 

     */

    private static final long serialVersionUID = 1L;



    //--------------------------------------------------



    private boolean uparrow, leftarrow;



    public Example () {



        addKeyListener(this);

        setFocusable(true);

    }  



    public static void main (String args) {



        JFrame f = new JFrame();



        f.setSize(600, 600);

        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);



        f.add(new Example());



        f.setVisible(true);

    }



    public void paintComponent(Graphics g) {



        if (uparrow && leftarrow) {



            g.setColor(Color.BLACK);

            g.fillRect(0, 0, 600, 600);

        }

    }



    @Override

    public void keyPressed(KeyEvent arg0) {



        if (arg0.getKeyCode() == KeyEvent.VK_UP) {



            uparrow = true;

            System.out.println("uparrow down!");

        }



                if (arg0.getKeyCode() == KeyEvent.VK_LEFT) {



            leftarrow = true;

            System.out.println("leftarrow down!");

                }

    }



    @Override

    public void keyReleased(KeyEvent arg0) {



                if (arg0.getKeyCode() == KeyEvent.VK_UP) {



                        uparrow = false;

                }



                if (arg0.getKeyCode() == KeyEvent.VK_LEFT) {



                        leftarrow = false

                }

    }



    @Override

    public void keyTyped(KeyEvent arg0) {



                if (arg0.getKeyChar() == ' ') {



                        System.out.println("space down!");



                        if (uparrow && leftarrow) {



                                repaint();

                        }

                }

        }

}

This example code.(I'm sorry for the bad indenting, I couldn't get it to work right) If you press the up-, and left-arrow keys, then follow up with the spacebar, nothing will happen. When you replace the 'VK_LEFT's with 'VK_RIGHT's the program works normally and a black rectangle appears in the JFrame.