Java by API/java.awt/AWTEvent

AWTEvent.MOUSE_EVENT_MASK

 
// This example is from the book _Java AWT Reference_ by John Zukowski.
// Written by John Zukowski.  Copyright (c) 1997 O"Reilly & Associates.
// You may study, use, modify, and distribute this example for any purpose.
// This example is provided WITHOUT WARRANTY either expressed or
import java.awt.AWTEvent;
import java.awt.AWTEventMulticaster;
import java.awt.ruponent;
import java.awt.Frame;
import java.awt.ItemSelectable;
import java.awt.SystemColor;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.MouseEvent;
class ItemEventComponent extends Component implements ItemSelectable {
  boolean selected;
  int i = 0;
  ItemListener itemListener = null;
  ItemEventComponent() {
    enableEvents(AWTEvent.MOUSE_EVENT_MASK);
  }
  public Object[] getSelectedObjects() {
    Object o[] = new Object[1];
    o[0] = new Integer(i);
    return o;
  }
  public void addItemListener(ItemListener l) {
    itemListener = AWTEventMulticaster.add(itemListener, l);
  }
  public void removeItemListener(ItemListener l) {
    itemListener = AWTEventMulticaster.remove(itemListener, l);
  }
  public void processEvent(AWTEvent e) {
    if (e.getID() == MouseEvent.MOUSE_PRESSED) {
      if (itemListener != null) {
        selected = !selected;
        i++;
        itemListener.itemStateChanged(new ItemEvent(this, ItemEvent.ITEM_STATE_CHANGED,
            getSelectedObjects(), (selected ? ItemEvent.SELECTED : ItemEvent.DESELECTED)));
      }
    }
  }
}
public class MainClass extends Frame implements ItemListener {
  MainClass() {
    super("Listening In");
    ItemEventComponent c = new ItemEventComponent();
    add(c, "Center");
    c.addItemListener(this);
    c.setBackground(SystemColor.control);
    setSize(200, 200);
  }
  public void itemStateChanged(ItemEvent e) {
    Object[] o = e.getItemSelectable().getSelectedObjects();
    Integer i = (Integer) o[0];
    System.out.println(i);
  }
  public static void main(String args[]) {
    MainClass f = new MainClass();
    f.show();
  }
}

AWTEvent.WINDOW_EVENT_MASK

  
import java.awt.AWTEvent;
import java.awt.Toolkit;
import java.awt.event.AWTEventListener;
import java.awt.event.ActionEvent;
import java.awt.event.ruponentEvent;
import java.awt.event.WindowEvent;
import javax.swing.AbstractAction;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
public class Main implements AWTEventListener {
  public void eventDispatched(AWTEvent evt) {
    if (evt.getID() == WindowEvent.WINDOW_OPENED) {
      ComponentEvent cev = (ComponentEvent) evt;
      if (cev.getComponent() instanceof JFrame) {
        System.out.println("event: " + evt);
        JFrame frame = (JFrame) cev.getComponent();
        loadSettings(frame);
      }
    }
  }
  public static void loadSettings(JFrame frame) {
    System.out.println("loading");
  }
  public static void saveSettings() {
    System.out.println("saving");
  }
  public static void main(String[] args) throws Exception {
    Toolkit tk = Toolkit.getDefaultToolkit();
    final Main main = new Main();
    tk.addAWTEventListener(main, AWTEvent.WINDOW_EVENT_MASK);
    final JFrame frame = new JFrame("");
    frame.setName("your frame");
    JMenuBar mb = new JMenuBar();
    JMenu menu = new JMenu("File");
    menu.add(new AbstractAction("Quit") {
      public void actionPerformed(ActionEvent evt) {
        try {
          main.saveSettings();
          System.exit(0);
        } catch (Exception ex) {
          System.out.println(ex);
        }
      }
    });
    mb.add(menu);
    frame.setJMenuBar(mb);
    frame.pack();
    frame.setVisible(true);
  }
}