Java by API/java.awt/AWTEventMulticaster

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AWTEventMulticaster: add(ActionListener a, ActionListener b)

 
import java.awt.AWTEventMulticaster;
import java.awt.BorderLayout;
import java.awt.Color;
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 javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Main {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Key Text Sample");
    KeyTextComponent keyTextComponent = new KeyTextComponent();
    final JTextField textField = new JTextField();
    ActionListener actionListener = new ActionListener() {
      public void actionPerformed(ActionEvent actionEvent) {
        String keyText = actionEvent.getActionCommand();
        textField.setText(keyText);
      }
    };
    keyTextComponent.addActionListener(actionListener);
    frame.add(keyTextComponent, BorderLayout.CENTER);
    frame.add(textField, BorderLayout.SOUTH);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}
class KeyTextComponent extends JPanel {
  private ActionListener actionListenerList = null;
  public KeyTextComponent() {
    setBackground(Color.cyan);
    KeyListener internalKeyListener = new KeyAdapter() {
      public void keyPressed(KeyEvent keyEvent) {
        if (actionListenerList != null) {
          int keyCode = keyEvent.getKeyCode();
          String keyText = KeyEvent.getKeyText(keyCode);
          ActionEvent actionEvent = new ActionEvent(this,
              ActionEvent.ACTION_PERFORMED, keyText);
          actionListenerList.actionPerformed(actionEvent);
        }
      }
    };
    MouseListener internalMouseListener = new MouseAdapter() {
      public void mousePressed(MouseEvent mouseEvent) {
        requestFocus();
      }
    };
    addKeyListener(internalKeyListener);
    addMouseListener(internalMouseListener);
  }
  public void addActionListener(ActionListener actionListener) {
    actionListenerList = AWTEventMulticaster.add(actionListenerList,
        actionListener);
  }
  public void removeActionListener(ActionListener actionListener) {
    actionListenerList = AWTEventMulticaster.remove(actionListenerList,
        actionListener);
  }
}





AWTEventMulticaster: add(ItemListener a, ItemListener b)

 
// 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();
  }
}





AWTEventMulticaster: remove(ActionListener l, ActionListener oldl)

 
import java.awt.AWTEventMulticaster;
import java.awt.BorderLayout;
import java.awt.Color;
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 javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Main {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Key Text Sample");
    KeyTextComponent keyTextComponent = new KeyTextComponent();
    final JTextField textField = new JTextField();
    ActionListener actionListener = new ActionListener() {
      public void actionPerformed(ActionEvent actionEvent) {
        String keyText = actionEvent.getActionCommand();
        textField.setText(keyText);
      }
    };
    keyTextComponent.addActionListener(actionListener);
    frame.add(keyTextComponent, BorderLayout.CENTER);
    frame.add(textField, BorderLayout.SOUTH);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}
class KeyTextComponent extends JPanel {
  private ActionListener actionListenerList = null;
  public KeyTextComponent() {
    setBackground(Color.cyan);
    KeyListener internalKeyListener = new KeyAdapter() {
      public void keyPressed(KeyEvent keyEvent) {
        if (actionListenerList != null) {
          int keyCode = keyEvent.getKeyCode();
          String keyText = KeyEvent.getKeyText(keyCode);
          ActionEvent actionEvent = new ActionEvent(this,
              ActionEvent.ACTION_PERFORMED, keyText);
          actionListenerList.actionPerformed(actionEvent);
        }
      }
    };
    MouseListener internalMouseListener = new MouseAdapter() {
      public void mousePressed(MouseEvent mouseEvent) {
        requestFocus();
      }
    };
    addKeyListener(internalKeyListener);
    addMouseListener(internalMouseListener);
  }
  public void addActionListener(ActionListener actionListener) {
    actionListenerList = AWTEventMulticaster.add(actionListenerList,
        actionListener);
  }
  public void removeActionListener(ActionListener actionListener) {
    actionListenerList = AWTEventMulticaster.remove(actionListenerList,
        actionListener);
  }
}





AWTEventMulticaster: remove(ItemListener l, ItemListener oldl)

 
// 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();
  }
}


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