import java.awt.*;
import java.awt.event.*;
import java.applet.*;public class KeyboardTest extends Applet implements KeyListener{ public void init(){
keyChar='A';
addKeyListener(this);
}
public void paint(Graphics g){
g.drawString("Press any key..",20,20 );
g.drawString("Key code:"+keyCode,20,50 );
g.drawString("Key char:"+keyChar,20,70 );
}
public void keyPressed(KeyEvent e){
keyCode=e.getKeyCode();
keyChar=' ';
repaint();
}
public void keyReleased(KeyEvent e){ }
public void keyTyped(KeyEvent e){
keyChar=e.getKeyChar();
repaint();
}
private int keyCode;
private char keyChar;}
这个程序编译没有错误,也能运行。可是键盘不响应,没有达到我想要的效果,请高手指点,是哪里出了问题?
import java.awt.event.*;
import java.applet.*;public class KeyboardTest extends Applet implements KeyListener{ public void init(){
keyChar='A';
addKeyListener(this);
}
public void paint(Graphics g){
g.drawString("Press any key..",20,20 );
g.drawString("Key code:"+keyCode,20,50 );
g.drawString("Key char:"+keyChar,20,70 );
}
public void keyPressed(KeyEvent e){
keyCode=e.getKeyCode();
keyChar=' ';
repaint();
}
public void keyReleased(KeyEvent e){ }
public void keyTyped(KeyEvent e){
keyChar=e.getKeyChar();
repaint();
}
private int keyCode;
private char keyChar;}
这个程序编译没有错误,也能运行。可是键盘不响应,没有达到我想要的效果,请高手指点,是哪里出了问题?
import java.awt.event.*;public class TestKey extends Frame {
public void lunch() {
setBounds(200,200,400,400);
setVisible(true);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
setVisible(false);
System.exit(-1);
}
});
this.addKeyListener(new Test()); }
class Test extends KeyAdapter {
public void keyPressed(KeyEvent e) {
int keycode = e.getKeyCode();
switch(keycode) {
case KeyEvent.VK_UP:
System.out.println("up");
break;
case KeyEvent.VK_DOWN:
System.out.println("down");
break;
default:
System.out.println("别的键");
} }
}
public static void main(String[] args) {
new TestKey().lunch();
}
}
写个main方法测试一下
“写main方法测试”是不是改成应用程序测试啊?