Проблема возникает при навешивании KeyListenera на JFrame - приложение почему-то начинает считывать данные с клавиатуры.
Дано:
1) окно JFrame
| Код |
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.HeadlessException;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.KeyListener;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.WindowListener;
import java.awt.image.BufferStrategy;
import javax.swing.JFrame;
public class Window extends JFrame {
private static final long serialVersionUID = -6079457947651675591L;
public BufferStrategy bufferStrategy;
public Graphics g;
public int W;
public int H;
public Window(int H, int W, String title, WindowListener WL,
KeyListener KL, MouseMotionListener MML, MouseListener ML) {
super();
{
setIgnoreRepaint(true);
// setMinimumSize(new Dimension(W, H));
// setMaximumSize(new Dimension(W, H));
this.W = W;
this.H = H;
setResizable(false);
setTitle(title);
JFrame.setDefaultLookAndFeelDecorated(true);
// 2. Optional: What happens when the frame closes?
canvas = new Canvas();
canvas.setIgnoreRepaint(true);
canvas.setSize(W, H);
canvas.setBackground(Color.GRAY);
add(canvas);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
addWindowListener(WL);
addKeyListener(KL);
canvas.addMouseListener(ML);
// addMouseListener(ML);
canvas.addMouseMotionListener(MML);
// // 3. Create components and put them in the frame.
// ...create emptyLabel...
// frame.getContentPane().add(emptyLabel, BorderLayout.CENTER);
getContentPane();
// Add canvas to game window...
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension screenSize = tk.getScreenSize();
int h = screenSize.height;
int w = screenSize.width;
// this.setBackground(Color.WHITE);
pack();
setVisible(true);
setLocation((w - this.getWidth()) / 2, (h - this.getHeight()) / 2);
// System.out.println(this.getWidth());
canvas.createBufferStrategy(2);
bufferStrategy = canvas.getBufferStrategy();
}
System.gc();
// createBufferStrategy(2);
// bufferStrategy = getBufferStrategy();
}
final Canvas canvas;
public final static void close(Window w) {
// TODO Auto-generated method stub
w.setVisible(false);
w.dispose();
System.gc();
}
}
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2) KeyListener
| Код |
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
public class KeyBoard implements KeyListener {
@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub
System.out.println("t:" + e);
}
@Override
public void keyPressed(KeyEvent e) {
// TODO Auto-generated method stub
System.out.println("p:" + e);
}
@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub
System.out.println("r:" + e);
}
}
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Запускаю:
| Код |
public static void main(String[] args) {
// TODO Auto-generated method stub
KeyBoard k = new KeyBoard();
Window w = new Window(480, 640, "test", null, k, null, null);
}
|
Что ожидал увидеть в консоли:
| Код |
p:java.awt.event.KeyEvent[KEY_PRESSED,keyCode=70,keyText=F,keyChar='f',keyLocation=KEY_LOCATION_STANDARD,rawCode=70,primaryLevelUnicode=102,scancode=33] on frame0
t:java.awt.event.KeyEvent[KEY_TYPED,keyCode=0,keyText=Unknown keyCode: 0x0,keyChar='f',keyLocation=KEY_LOCATION_UNKNOWN,rawCode=0,primaryLevelUnicode=0,scancode=0] on frame0
r:java.awt.event.KeyEvent[KEY_RELEASED,keyCode=70,keyText=F,keyChar='f',keyLocation=KEY_LOCATION_STANDARD,rawCode=70,primaryLevelUnicode=102,scancode=33] on frame0
p:java.awt.event.KeyEvent[KEY_PRESSED,keyCode=68,keyText=D,keyChar='d',keyLocation=KEY_LOCATION_STANDARD,rawCode=68,primaryLevelUnicode=100,scancode=32] on frame0
t:java.awt.event.KeyEvent[KEY_TYPED,keyCode=0,keyText=Unknown keyCode: 0x0,keyChar='d',keyLocation=KEY_LOCATION_UNKNOWN,rawCode=0,primaryLevelUnicode=0,scancode=0] on frame0
...
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Но иногда вместо этого запускается считывани с консоли:
Вопрос: это баг или Я не прав? Что Я делаю не так?
спасибо.
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