Назад Вперед
Исходные тексты аплета Rectangles приведены
в листинге 1.
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();
}
}
}
} |