Multithreading in java

When more than one task is executing concurrently within a single program is called multithreading in Java . Thread in Java is controlled by java.lang.Thread class. Each program can be divided into number of small process . Each small process is called a single thread . Thread is a lightweight process. Thread can be created using this two way .

• implementing Runnable interface 
• extending Thread class 

  Advantage of Thread : 

•       Threads are independent 
•        Each task of a program can be executed and shared separated memory area. 
•        It's a lightweight process . 
•       Communication coast is low between the Threads .

  Life cycle of a thread :
                                

 Example using Runnable interface :

 public class HelloRunnable implements Runnable {

    public void run() {
        System.out.println("Hello from a runnable thread!");
    }

    public static void main(String args[]) {
        (new Thread(new HelloRunnable())).start();
    }

}

Example using Thread interface :

public class HelloThread extends Thread {

    public void run() {
        System.out.println("Hello from a thread!");
    }

    public static void main(String args[]) {
        (new HelloThread()).start();
    }

}

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