1.Swing自定义事件-将一个组件的事件传递给另一个组件.

使用EventListenerList来管理事件,当A组件触发事件的时候,调用方法fireActionPerformed()来触发事件,然后再B组件中 actionPerformed()方法来接收事件.

当在容器KeyTextComponent中按下鼠标,我们就可以在Jframe中捕获触发的事件.

import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.event.MouseListener;import java.util.EventListener;import javax.swing.JComponent;import javax.swing.JFrame;import javax.swing.JTextField;import javax.swing.event.EventListenerList;class KeyTextComponent extends JComponent {  private EventListenerList actionListenerList = new EventListenerList();  public KeyTextComponent() {    KeyListener internalKeyListener = new KeyAdapter() {      public void keyPressed(KeyEvent keyEvent) {        System.out.println("keyPressed");        if (actionListenerList != null) {          int keyCode = keyEvent.getKeyCode();          String keyText = KeyEvent.getKeyText(keyCode);          ActionEvent actionEvent = new ActionEvent(this, ActionEvent.ACTION_PERFORMED, keyText);          fireActionPerformed(actionEvent);//触发事件        }      }    };    MouseListener internalMouseListener = new MouseAdapter() {      public void mousePressed(MouseEvent mouseEvent) {        requestFocusInWindow();      }    };    addKeyListener(internalKeyListener);    addMouseListener(internalMouseListener);  }  public void addActionListener(ActionListener actionListener) {//事件管理    actionListenerList.add(ActionListener.class, actionListener);  }  public void removeActionListener(ActionListener actionListener) {    actionListenerList.remove(ActionListener.class, actionListener);  }  protected void fireActionPerformed(ActionEvent actionEvent) {//触发事件    EventListener listenerList[] = actionListenerList.getListeners(ActionListener.class);    for (int i = 0, n = listenerList.length; i < n; i++) {      ((ActionListener) listenerList[i]).actionPerformed(actionEvent);    }  }  public boolean isFocusable() {    return true;  }}public class KeyTextComponentDemo {  public static void main(String[] args) {    JFrame aWindow = new JFrame();    aWindow.setBounds(30, 30, 300, 300); // Size    aWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    KeyTextComponent com = new KeyTextComponent();    aWindow.add(com, "Center");    com.addActionListener(new ActionListener() {      public void actionPerformed(ActionEvent e) {        System.out.println("action");//获取事件      }    });    aWindow.add(new JTextField(), "South");    aWindow.setVisible(true); // Display the window  }}