Подробное руководство по программированию на Java

         

public class Rectangles extends Applet



Листинг 1

. Файл Rectangles,java import java.applet.*; import java.awt.*; public class Rectangles extends Applet { DrawRectangles m_DrawRectThread = null; DrawEllipse m_DrawEllipseThread = null; NotifyTask m_NotifyTaskThread = null public String getAppletInfo() { return "Name: Rectangles"; } public void paint(Graphics g) { Dimension dimAppWndDimension = getSize();
g.setColor(Color.yellow);
g.fillRect(0, 0, dimAppWndDimension.width - 1, dimAppWndDimension.height - 1);
g.setColor(Color.black);
g.drawRect(0, 0, dimAppWndDimension.width - 1, dimAppWndDimension.height - 1);
} public void start() { if (m_DrawRectThread == null) { m_DrawRectThread = new DrawRectangles(this);
m_DrawRectThread.start();
} if (m_DrawEllipseThread == null) { m_DrawEllipseThread = new DrawEllipse(this);
m_DrawEllipseThread.start();
} if (m_NotifyTaskThread == null) { m_NotifyTaskThread = new NotifyTask(m_DrawEllipseThread);
m_NotifyTaskThread.start();
} } public void stop() { if (m_DrawRectThread != null) { m_DrawRectThread.stop();
m_DrawRectThread = null; } if (m_DrawEllipseThread == null) { m_DrawEllipseThread.stop();
m_DrawEllipseThread = null; } if (m_NotifyTaskThread != null) { m_NotifyTaskThread.stop();
m_NotifyTaskThread = null; } } } class DrawRectangles extends Thread { Graphics g; Dimension dimAppWndDimension; public DrawRectangles(Applet Appl) { g = Appl.getGraphics();
dimAppWndDimension = Appl.getSize();
} public void run() { while (true) { int x, y, width, height; int rColor, gColor, bColor; x = (int)(dimAppWndDimension.width * Math.random());
y = (int)(dimAppWndDimension.height * Math.random());
width = (int)(dimAppWndDimension.width * Math.random()) / 2; height = (int)(dimAppWndDimension.height * Math.random()) / 2; rColor = (int)(255 * Math.random());
gColor = (int)(255 * Math.random());
bColor = (int)(255 * Math.random());
g.setColor(new Color(rColor, gColor, bColor));
g.fillRect(x, y, width, height);
try { Thread.sleep(50);
} catch (InterruptedException e) { stop();
} } } } class DrawEllipse extends Thread { Graphics g; Dimension dimAppWndDimension; public DrawEllipse(Applet Appl) { g = Appl.getGraphics();
dimAppWndDimension = Appl.getSize();
} public synchronized void run() { while (true) { int x, y, width, height; int rColor, gColor, bColor; x = (int)(dimAppWndDimension.width * Math.random());
y = (int)(dimAppWndDimension.height * Math.random());
width = (int)(dimAppWndDimension.width * Math.random()) / 2; height = (int)(dimAppWndDimension.height * Math.random()) / 2; rColor = (int)(255 * Math.random());
gColor = (int)(255 * Math.random());
bColor = (int)(255 * Math.random());
g.setColor(new Color(rColor, gColor, bColor));
g.fillOval(x, y, width, height);
try { this.wait();
} catch (InterruptedException e) { } } } } class NotifyTask extends Thread { Thread STask; public NotifyTask(Thread SynchroTask) { STask = SynchroTask; } public void run() { while (true) { try { Thread.sleep(30);
} catch (InterruptedException e) { } synchronized(STask) { STask.notify();
} } } }

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