JComboBox为何响应不了任何键盘事件?

Question

我用的是eclipse3.1 swt-designer4.1 在做swing applet时,加了个JComboBox,在左边的事件中双击了keyPressed事件,但无论我按什么键都不触发此事件.  public void keyPressed(KeyEvent e) {
      System.out.println("asdf");
  }(这个JComboBox 的editable属性为true的)

Answer 1

楼主把代码贴出来吧，可以copy调试

Answer 2

package dep.kil.tickets;import java.awt.event.InputMethodEvent;
import java.awt.event.InputMethodListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.CompoundBorder;public class A_Tickets_sale extends JApplet { private JComboBox comboBox;
private JTextField textField;
public A_Tickets_sale() {
super();
getContentPane().setLayout(null); final JPanel panel = new JPanel();
panel.setLayout(null);
panel.setBounds(10, 5, 482, 85);
getContentPane().add(panel); textField = new JTextField();
textField.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e){
System.out.println("asdfasdfasdf");
}
});
textField.setBounds(6, 3, 63, 21);
panel.add(textField); final JLabel label = new JLabel();
label.setText("New JLabel");
label.setBounds(100, 10, 75, 25);
panel.add(label); final JButton button = new JButton();
button.setText("New JButton");
button.setBounds(35, 45, 90, 25);
panel.add(button); comboBox = new JComboBox();
comboBox.setSelectedIndex(0);
comboBox.setBorder(new CompoundBorder(null, null));
comboBox.addInputMethodListener(new InputMethodListener() {
public void caretPositionChanged(InputMethodEvent e) {
}
public void inputMethodTextChanged(InputMethodEvent e) {
System.out.println("asldkf");
}
});
comboBox.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
System.out.println("asdf"); }
public void keyTyped(KeyEvent e) {
System.out.println("type");
}
public void keyReleased(KeyEvent e) {
System.out.println("release");
}
});
comboBox.setModel(new DefaultComboBoxModel(new String[] {"天河", "芳村", "海珠", "东山", "越秀"}));
comboBox.setEditable(true);
comboBox.setBounds(195, 10, 95, 30);
panel.add(comboBox);
//
}}

Answer 3

comboBox.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
System.out.println("asdf"); }
public void keyTyped(KeyEvent e) {
System.out.println("type");
}
public void keyReleased(KeyEvent e) {
System.out.println("release");
}
});
里的事件全没反应

Answer 4

楼主，applet的初始化不需要构造函数
applet有它自己的一些方法
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.CompoundBorder;public class A_Tickets_sale extends JApplet { private JComboBox comboBox; private JTextField textField; public void init() {
getContentPane().setLayout(null); final JPanel panel = new JPanel();
panel.setLayout(null);
panel.setBounds(10, 5, 482, 85);
getContentPane().add(panel); textField = new JTextField();
textField.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
System.out.println("asdfasdfasdf");
}
});
textField.setBounds(6, 3, 63, 21);
panel.add(textField); final JLabel label = new JLabel();
label.setText("New JLabel");
label.setBounds(100, 10, 75, 25);
panel.add(label); final JButton button = new JButton();
button.setText("New JButton");
button.setBounds(35, 45, 90, 25);
panel.add(button); comboBox = new JComboBox();
comboBox.setBorder(new CompoundBorder(null, null));
comboBox.addInputMethodListener(new InputMethodListener() {
public void caretPositionChanged(InputMethodEvent e) {
} public void inputMethodTextChanged(InputMethodEvent e) {
System.out.println("asldkf");
}
});
comboBox.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
System.out.println("asdf"); } public void keyTyped(KeyEvent e) {
System.out.println("type");
} public void keyReleased(KeyEvent e) {
System.out.println("release");
}
});
comboBox.setModel(new DefaultComboBoxModel(new String[] { "天河", "芳村",
"海珠", "东山", "越秀" }));
comboBox.setEditable(true);
comboBox.setBounds(195, 10, 95, 30);
panel.add(comboBox);
//
}}

Answer 5

to believefym(feng):
  首先,它怎样初始化我没留意到.因为我是用eclipse+swt-designer新建一个JApplet出来,相信它建出来的APPLET的初始化方法不会有什么问题.
  另外,我把你帖出来的代放回去.当然,初始化方法是不同,但都一样能正确运行起来.但我之前所提出的combox监听不到任何键盘事件的问题还是没有解决.