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Chapter: Object Oriented Programming(OOP) : Java Exception Handling

Multithreaded Programming

Object Oriented Programming(OOP) - Java Exception Handling

MULTITHREADED PROGRAMMING

 

A single threaded program class ABC

 

{

….

public void main(..)

{

..

}

}

 

A Multithreaded Program



Multithreading – Multiprocessors


An example

 

class MyThread extends Thread { // the thread public void run() {

 

System.out.println(" this thread is running ... ");

}

} // end class MyThread

 

class ThreadEx1 { // a program that utilizes the thread

public static void main(String [] args ) {

 

MyThread t = new MyThread();

//  due to extending the Thread class (above)

//  I can call start(), and this will call

//  run(). start() is a method in class Thread.

t.start();

} // end main()

}// end class ThreadEx1

class MyThread implements Runnable

{

.....

public void run()

{

// thread body of execution

 

 

}

}

 

Creating Object:

 

MyThread myObject = new MyThread();

n Creating Thread Object:

 

Thread thr1 = new Thread( myObject );

n Start Execution:

thr1.start();

 

class MyThread implements Runnable { public void run() {

 

System.out.println(" this thread is running ... ");

}

 

} // end class MyThread

class ThreadEx2 {

 

public static void main(String [] args ) { Thread t = new Thread(new MyThread());

//  due to implementing the Runnable interface

//  I can call start(), and this will call run().

 

t.start(); } // end main()

 

}// end class ThreadEx2

 

Life Cycle of Thread


 

Three threads example

class A extends Thread

{

public void run()

{

for(int i=1;i<=5;i++)

{

System.out.println("\t From ThreadA: i= "+i);

}

System.out.println("Exit from A");

}

}

class B extends Thread

{

 

public void run()

{

for(int j=1;j<=5;j++)

{

System.out.println("\t From ThreadB: j= "+j);

}

System.out.println("Exit from B");

}

}

class C extends Thread

{

public void run()

{

for(int k=1;k<=5;k++)

{

System.out.println("\t From ThreadC: k= "+k);

}

System.out.println("Exit from C");

}

}

class ThreadTest

 

{

public static void main(String args[])

{

 

new A().start(); new B().start(); new C().start();

 

}

}

 

[raj@mundroo] threads [1:76] java ThreadTest From ThreadA: i= 1

 

From ThreadA: i= 2 From ThreadA: i= 3

 

 

 

From ThreadA: i= 4

From ThreadA: i= 5

Exit from A

From ThreadC: k= 1

From ThreadC: k= 2

From ThreadC: k= 3

From ThreadC: k= 4

From ThreadC: k= 5

Exit from C

From ThreadB: j= 1

From ThreadB: j= 2

From ThreadB: j= 3

From ThreadB: j= 4

 

From ThreadB: j= 5

Exit from B

 

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