javademo.java

有关java的源程序,为讲授java程序设计课程使用

					displayString="世界，您好! 我的 Friend !";
			}
			stringX=(rectSize.width-fm.stringWidth(displayString))/2;
			g.drawString(displayString,stringX,20);
		}
		else
			g.drawString("Loading Applet A images...", 10, 20);

		// TODO: Place additional applet Paint code here
		Color foreGround=getForeground();
		
		g.setColor(Color.red);
		g.draw3DRect(0,0,rectSize.width-1,rectSize.height-1,true);
		g.draw3DRect(3,3,rectSize.width-7,rectSize.height-7,false);
		g.setColor(foreGround);

	    setBackground(appletBackGround);
		
	}

	//		The start() method is called when the page containing the applet
	// first appears on the screen. The AppletWizard's initial implementation
	// of this method starts execution of the applet's thread.
	//--------------------------------------------------------------------------
	public void start()
	{
		if (m_JavaDemo1 == null)
		{
			m_JavaDemo1 = new Thread(this);
			m_JavaDemo1.start();
		}
		// TODO: Place additional applet start code here

		if (m_JavaDemo2 == null)
		{
			m_JavaDemo2 = new Thread(this);
			m_JavaDemo2.start();
		}

		if (m_JavaDemo3 == null)
		{
			m_JavaDemo3 = new Thread(this);
			m_JavaDemo3.start();
		}

		if (m_JavaDemo4 == null)
		{
			m_JavaDemo4 = new Thread(this);
			m_JavaDemo4.start();
		}
	}
	
	//		The stop() method is called when the page containing the applet is
	// no longer on the screen. The AppletWizard's initial implementation of
	// this method stops execution of the applet's thread.
	//--------------------------------------------------------------------------
	public void stop()
	{
		if (m_JavaDemo1 != null)
		{
			m_JavaDemo1.stop();
			m_JavaDemo1 = null;
		}

		// TODO: Place additional applet stop code here

		if (m_JavaDemo2 != null)
		{
			m_JavaDemo2.stop();
			m_JavaDemo2 = null;
		}

		if (m_JavaDemo3 != null)
		{
			m_JavaDemo3.stop();
			m_JavaDemo3 = null;
		}

		if (m_JavaDemo4 != null)
		{
			m_JavaDemo4.stop();
			m_JavaDemo4 = null;
		}
	}

	// THREAD SUPPORT
	//		The run() method is called when the applet's thread is started. If
	// your applet performs any ongoing activities without waiting for user
	// input, the code for implementing that behavior typically goes here. For
	// example, for an applet that performs animation, the run() method controls
	// the display of images.
	//--------------------------------------------------------------------------
	public void run()
	{
		m_nCurrImage = 0;
		
		// If re-entering the page, then the images have already been loaded.
		// m_fAllLoaded == TRUE.
		//----------------------------------------------------------------------
        if (!m_fAllLoaded)
		{
    		repaint();
    		m_Graphics = getGraphics();
    		JavaDemo.m_Images = new Image[NUM_IMAGES];

    		// Load in all the images
    		//------------------------------------------------------------------
    		MediaTracker tracker = new MediaTracker(this);
    		String strImage;

    		// For each image in the animation, this method first constructs a
    		// string containing the path to the image file; then it begins
    		// loading the image into the m_Images array.  Note that the call to
    		// getImage will return before the image is completely loaded.
    		//------------------------------------------------------------------
			
    		for (int i = 1; i <= NUM_IMAGES; i++)
    		{
    			// Build path to next image
    			//--------------------------------------------------------------
    			strImage = "images\\img00" + ((i < 10) ? "0" : "") + i + ".gif";
				if(!m_fStandAlone)
				     showStatus("Applet Is Loading Image File:"+System.getProperty("user.dir")+"\\"+strImage);
    			if (m_fStandAlone)
    				JavaDemo.m_Images[i-1] =Toolkit.getDefaultToolkit().getImage(strImage);
    			else
				   JavaDemo.m_Images[i-1] = getImage(getDocumentBase(), strImage);

                tracker.addImage(JavaDemo.m_Images[i-1], 0);
    		}

    		// Wait until all images are fully loaded
    		//------------------------------------------------------------------
			try
			{
				tracker.waitForAll();
				m_fAllLoaded = !tracker.isErrorAny();
			}
			catch (InterruptedException e)
			{
				// TODO: Place exception-handling code here in case an
				//       InterruptedException is thrown by Thread.sleep(),
				//		 meaning that another thread has interrupted this one
			}
			
			if (!m_fAllLoaded)
			{
			    stop();
			    m_Graphics.drawString("Error loading images!", 10, 40);
			    return;
			}
			

			// Assuming all images are same width and height.
			//--------------------------------------------------------------
		    m_nImgWidth  = JavaDemo.m_Images[0].getWidth(this);
		    m_nImgHeight = JavaDemo.m_Images[0].getHeight(this);
        }	
		if(!m_fStandAlone)
		      showStatus("Now Applet's Image File Is Loaded Completely");
		repaint();

		while (true)
		{
			try
			{
				// Draw next image in animation
				//--------------------------------------------------------------
				displayImage(m_Graphics);
				m_nCurrImage++;
				if (m_nCurrImage == NUM_IMAGES)
					m_nCurrImage = 0;

				// TODO:  Add additional thread-specific code here
				Thread.sleep(50);
			}
			catch (InterruptedException e)
			{
				// TODO: Place exception-handling code here in case an
				//       InterruptedException is thrown by Thread.sleep(),
				//		 meaning that another thread has interrupted this one
				stop();
			}
		}
	}

	
	public boolean action(Event event,Object obj)
	{
		String displayString;
		if(event.target==stopDialog.IDCSTOP)
		{
			stopDialog.IDCSTOP.setFont(new Font("Helvetica",Font.PLAIN,14));
			if(stopFlag)
			{
				stop();
				stopFlag=false;
				displayString="Click Here,Start The World !";
			}
			else
			{
				start();
				stopFlag=true;
				displayString="Click Here,Stop The World !";
			}
			stopDialog.IDCSTOP.setLabel(displayString);
			if(!m_fStandAlone)
			{
			       Applet receiveApplet=
						getAppletContext().getApplet(getParameter("Receive"));
			       ((JavaApplet)receiveApplet).processRequestFrom(displayString);
			}
		}
		return false;
	}
	// MOUSE SUPPORT:
	//		The mouseDown() method is called if the mouse button is pressed
	// while the mouse cursor is over the applet's portion of the screen.
	//--------------------------------------------------------------------------
	public boolean mouseDown(Event evt, int x, int y)
	{
		// TODO: Place applet mouseDown code here
		
		return true;
	}

	// MOUSE SUPPORT:
	//		The mouseUp() method is called if the mouse button is released
	// while the mouse cursor is over the applet's portion of the screen.
	//--------------------------------------------------------------------------
	public boolean mouseUp(Event evt, int x, int y)
	{
		// TODO: Place applet mouseUp code here
		return true;
	}

	// MOUSE SUPPORT:
	//		The mouseDrag() method is called if the mouse cursor moves over the
	// applet's portion of the screen while the mouse button is being held down.
	//--------------------------------------------------------------------------
	public boolean mouseDrag(Event evt, int x, int y)
	{
		// TODO: Place applet mouseDrag code here
		return true;
	}

	// MOUSE SUPPORT:
	//		The mouseMove() method is called if the mouse cursor moves over the
	// applet's portion of the screen and the mouse button isn't being held down.
	//--------------------------------------------------------------------------
	public boolean mouseMove(Event evt, int x, int y)
	{
		// TODO: Place applet mouseMove code here
		return true;
	}

	// MOUSE SUPPORT:
	//		The mouseEnter() method is called if the mouse cursor enters the
	// applet's portion of the screen.
	//--------------------------------------------------------------------------
	public boolean mouseEnter(Event evt, int x, int y)
	{
		// TODO: Place applet mouseEnter code here
		return true;
	}

	// MOUSE SUPPORT:
	//		The mouseExit() method is called if the mouse cursor leaves the
	// applet's portion of the screen.
 	//--------------------------------------------------------------------------
	public boolean mouseExit(Event evt, int x, int y)
	{
		// TODO: Place applet mouseExit code here
		return true;
	}


	// TODO: Place additional applet code here

}