Multithreading program in java

Two way se create hota hai thread class

1:-    First ways

class Demo  extends Thread

{

 public void run()

{

System.out.println( "thread task");

}

public static void main (String []args)

{

Demo t= new Demo();

t.start(); // ayse program likhege to thread create ho jayega

}

}

C:\java>javac Testing.java

C:\java>java Demo

thread task

C:\java>

2:- or

class Demo  extends Thread

{

 public void run()

{

System.out.println( "thread task");

}

public static void main (String []args)

{

Demo t= new Demo();

t.run(); //is program me simple ek method create huaa

}

}

C:\java>javac Testing.java

C:\java>java Demo

thread task

C:\java>

3:-     Second Way

class Demo  implements Runnable

{

 public void run()

{

System.out.println( "thread task 2");

}

public static void main (String []args)

{

Demo t= new Demo();

 Thread th= new Thread(t);

th.start();

}

}

C:\java>javac Testing.java

C:\java>java Demo

thread task 2

C:\java>

or 

class Demo  implements Runnable

{

 public void run()

{

System.out.println( "thread task 2");

}

public static void main (String []args)

{

Demo t= new Demo();

Thread th= new Thread(); // isme kuch nahiprint nahi karega

th.start();

}

}

C:\java>javac Testing.java

C:\java>java Demo

C:\java>