JDK 1.1 Source Code Directory

JDK 1.1 source code directory contains Java source code for JDK 1.1 core classes: "C:\fyicenter\jdk-1.1.8\src".

Here is the list of Java classes of the JDK 1.1 source code:

✍: FYIcenter

java/awt/Button.java

/*
 * @(#)Button.java	1.44 01/12/10
 *
 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package java.awt;

import java.awt.peer.ButtonPeer;
import java.awt.event.*;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;


/**
 * This class creates a labeled button. The application can cause 
 * some action to happen when the button is pushed. This image 
 * depicts three views of a "<code>Quit</code>" button as it appears
 * under the Solaris operating system: 
 * <p> 
 * <img src="images-awt/Button-1.gif"
 * ALIGN=center HSPACE=10 VSPACE=7>  
 * <p>
 * The first view shows the button as it appears normally. 
 * The second view shows the button 
 * when it has input focus. Its outline is darkened to let the 
 * user know that it is an active object. The third view shows the 
 * button when the user clicks the mouse over the button, and thus 
 * requests that an action be performed.
 * <p>
 * The gesture of clicking on a button with the mouse
 * is associated with one instance of <code>ActionEvent</code>, 
 * which is sent out when the mouse is both pressed and released 
 * over the button. If an application is interested in knowing
 * when the button has been pressed but not released, as a separate 
 * gesture, it can specialize <code>processMouseEvent</code>, 
 * or it can register itself as a listener for mouse events by
 * calling <code>addMouseListener</code>. Both of these methods are
 * defined by <code>Component</code>, the abstract superclass of
 * all components.
 * <p>
 * When a button is pressed and released, AWT sends an instance  
 * of <code>ActionEvent</code> to the button, by calling 
 * <code>processEvent</code> on the button. The button's 
 * <code>processEvent</code> method receives all events
 * for the button; it passes an action event along by
 * calling its own <code>processActionEvent</code> method.
 * The latter method passes the action event on to any action
 * listeners that have registered an interest in action
 * events generated by this button.
 * <p>
 * If an application wants to perform some action based on  
 * a button being pressed and released, it should implement 
 * <code>ActionListener</code> and register the new listener 
 * to receive events from this button, by calling the button's
 * <code>addActionListener</code> method. The application can
 * make use of the button's action command as a messaging protocol.
 *
 * @version 	1.39 06/12/97
 * @author 	Sami Shaio
 * @see         java.awt.event.ActionEvent
 * @see         java.awt.event.ActionListener
 * @see         java.awt.Component#processMouseEvent
 * @see         java.awt.Component#addMouseListener
 * @since       JDK1.0
 */
public class Button extends Component {

    String label;
    String actionCommand;

    transient ActionListener actionListener;
    
    private static final String base = "button";
    private static int nameCounter = 0;
    
    /*
     * JDK 1.1 serialVersionUID 
     */
    private static final long serialVersionUID = -8774683716313001058L;

    /**
     * Constructs a Button with no label.
     * @since JDK1.0
     */
    public Button() {
	this("");
    }

    /**
     * Constructs a Button with the specified label.
     * @param label A string label for the button.
     * @since JDK1.0
     */
    public Button(String label) {
	this.label = label;
    }

    /**
     * Construct a name for this component.  Called by getName() when the
     * name is null.
     */
    String constructComponentName() {
	return base + nameCounter++;
    }

    /**
     * Creates the peer of the button.  The button's peer allows the
     * application to change the look of the button without changing 
     * its functionality.
     * @see     java.awt.Toolkit#createButton(java.awt.Button)
     * @see     java.awt.Component#getToolkit()
     * @since   JDK1.0
     */
    public void addNotify() {
        synchronized(getTreeLock()) {
	    if (peer == null)
			peer = getToolkit().createButton(this);
	    super.addNotify();
        }
    }

    /**
     * Gets the label of this button.
     * @return    the button's label, or <code>null</code> 
     *                if the button has no label.
     * @see       java.awt.Button#setLabel
     * @since     JDK1.0
     */
    public String getLabel() {
	return label;
    }

    /**
     * Sets the button's label to be the specified string.
     * @param     label   the new label, or <code>null</code> 
     *                if the button has no label.
     * @see       java.awt.Button#getLabel
     * @since     JDK1.0
     */
    public synchronized void setLabel(String label) {
	this.label = label;
	ButtonPeer peer = (ButtonPeer)this.peer;
	if (peer != null) {
	    peer.setLabel(label);
	}
    }

    /**
     * Sets the command name for the action event fired 
     * by this button. By default this action command is 
     * set to match the label of the button.
     * @param     command  A string used to set the button's 
     *                  action command.
     * @see       java.awt.event.ActionEvent
     * @since     JDK1.1
     */
    public void setActionCommand(String command) {
        actionCommand = command;
    }

    /**
     * Returns the command name of the action event fired by this button.
     */
    public String getActionCommand() {
        return (actionCommand == null? label : actionCommand);
    }

    /**
     * Adds the specified action listener to receive action events from
     * this button. Action events occur when a user presses or releases
     * the mouse over this button.
     * @param         l the action listener.
     * @see           java.awt.event.ActionListener
     * @see           java.awt.Button#removeActionListener
     * @since         JDK1.1
     */ 
    public synchronized void addActionListener(ActionListener l) {
	actionListener = AWTEventMulticaster.add(actionListener, l);
        newEventsOnly = true;	
    }

    /**
     * Removes the specified action listener so that it no longer 
     * receives action events from this button. Action events occur  
     * when a user presses or releases the mouse over this button.
     * @param         l     the action listener.
     * @see           java.awt.event.ActionListener
     * @see           java.awt.Button#addActionListener
     * @since         JDK1.1
     */ 
    public synchronized void removeActionListener(ActionListener l) {
	actionListener = AWTEventMulticaster.remove(actionListener, l);
    }

    // REMIND: remove when filtering is done at lower level
    boolean eventEnabled(AWTEvent e) {
        if (e.id == ActionEvent.ACTION_PERFORMED) {
            if ((eventMask & AWTEvent.ACTION_EVENT_MASK) != 0 ||
                actionListener != null) {
                return true;
            }
            return false;
        }
        return super.eventEnabled(e);
    }          

    /**
     * Processes events on this button. If an event is 
     * an instance of <code>ActionEvent</code>, this method invokes  
     * the <code>processActionEvent</code> method. Otherwise,
     * it invokes <code>processEvent</code> on the superclass.
     * @param        e the event.
     * @see          java.awt.event.ActionEvent
     * @see          java.awt.Button#processActionEvent
     * @since        JDK1.1
     */
    protected void processEvent(AWTEvent e) {
        if (e instanceof ActionEvent) {
            processActionEvent((ActionEvent)e);     
            return;
        }
	super.processEvent(e);
    }

    /** 
     * Processes action events occurring on this button 
     * by dispatching them to any registered 
     * <code>ActionListener</code> objects.
     * <p>
     * This method is not called unless action events are 
     * enabled for this button. Action events are enabled 
     * when one of the following occurs:
     * <p><ul>
     * <li>An <code>ActionListener</code> object is registered 
     * via <code>addActionListener</code>.
     * <li>Action events are enabled via <code>enableEvents</code>.
     * </ul>
     * @param       e the action event.
     * @see         java.awt.event.ActionListener
     * @see         java.awt.Button#addActionListener
     * @see         java.awt.Component#enableEvents
     * @since       JDK1.1
     */  
    protected void processActionEvent(ActionEvent e) {
        if (actionListener != null) {
            actionListener.actionPerformed(e);
        }
    }

    /**
     * Returns the parameter string representing the state of this 
     * button. This string is useful for debugging. 
     * @return     the parameter string of this button.
     * @since      JDK1.0
     */
    protected String paramString() {
	return super.paramString() + ",label=" + label;
    }


    /* Serialization support. 
     */

    private int buttonSerializedDataVersion = 1;


    private void writeObject(ObjectOutputStream s)
      throws IOException 
    {
      s.defaultWriteObject();

      AWTEventMulticaster.save(s, actionListenerK, actionListener);
      s.writeObject(null);
    }


    private void readObject(ObjectInputStream s)
      throws ClassNotFoundException, IOException 
    {
      s.defaultReadObject();

      Object keyOrNull;
      while(null != (keyOrNull = s.readObject())) {
	String key = ((String)keyOrNull).intern();

	if (actionListenerK == key) 
	  addActionListener((ActionListener)(s.readObject()));

	else // skip value for unrecognized key
	  s.readObject();
      }
    }
  
}

java/awt/Button.java

 

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