java里的keyPressed键盘监听器没作用
import java.awt.*;
import java.awt.event.*;
public class KeyEvent {
public static void main(String[] args) {
new KeyFrame().launchFrame();
}
}
class KeyFrame extends Frame {
public void launchFrame() {
setBounds(300,300,400,300);
addKeyListener(new KeyMonitor());
setVisible(true);
}
class KeyMonitor extends KeyAdapter {
public void keyPressed(KeyEvent e) {
System.out.println("ok");
}
}
}
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