شرح مقرر البرمجة 2 "لغة جافا" - مادة النهائي كلية التكنولوجيا والعلوم التطبيقية جامعة القدس المفتوحة

1. 1

2. 
MultitaskingMultithreading.

3. Multithreads


Concurrency

4. 
Classrunnablerun()

5. 
Thread
Threadrunnablerun

6. CONVERTING A CLASS TO A
THREAD

1.runnable.
public class Myapplet extends Applet implements
Runnable
2.run()runnable
public void run() {........}
1.run()

7. 3.Thread
Thread thread;
4.Thread
public void start()
{
thread = new Thread(this);
thread.start();
}
thread = new Thread(this;(constructorthis

8. 5.Stopping The Threadrun()
public void stop()
{
theard.stop();
}

9. import java.awt.*;
import java.applet.*
public class ThreadApplet extends Applet implements
Runnable{
Thread thread;
int count; String displayStr;
Font font;
public void start() {
font = new Font("TimesRoman", Font.PLAIN, 72);
setFont(font);
count = 0; displayStr = " ";
thread = new Thread(this);
thread.start();}
public void stop()
{
thread.stop();}

10. public void run()
{ while (count < 1000)
{ ++count;
displayStr = String.valueOf(count):
repaint();
try
{
thread.sleep(100); }
catch(InterruptedException e) { }}
public void paint(Graphics g)
{
g.drawString(displayStr, 50, 130);
}}

11. THREAD
1.Thread
public class MyThread extends Thread
2.
MyThread (ThreadApplet2 applet)
{
this.applet = applet;
}

12. public class MyThread extends Thread
{ ThreadApplet2 applet;
int count;
MyThread (ThreadApplet2 applet)
{
this.applet = applet;
}
public void run()
{
count = 0;
while (count < 1000)
{++count;
applet.displayStr = String.valueOf(count);
applet.repaint();
try{ sleep(100); }
catch(InterruptedException e) { }}}}

14. synchronizedclass monitor object

15. monitor



17. ...

 A : starts
 B : starts
 A : 1
 B : 1
 A : 2
 B : 2
 A : Done
 B : Done
yield()

18. 

19. 



20. 

21. ProducerConsumer

.

22. Newborn
Runnable
Running

23. ...
Blocked
Dead
Killed