java thread model javatpoint | life cycle of thread in java

Create thread in Java

            There are two ways to create a thread:

1.    By extending Thread class

      By implementing Runnable interface.

threads in java

    

Thread class:

Thread class provide constructors and methods to create and perform operations on a thread.Thread class extends Object  class and implements Runnable interface.

Commonly used Constructors of Thread class:

o    Thread() o    Thread(String name) o    Thread(Runnable r) o    Thread(Runnable r,String name)

Commonly used methods of Thread class:

1.    public void run(): is used to perform action for a thread. 2.    public void start(): starts the execution of the thread. JVM calls the run() method on the thread. 3.    public void sleep(long miliseconds): Causes the currently executing thread to sleep (temporarily cease execution) for the specified number of milliseconds. 4.    public void join(): waits for a thread to die. 5.    public void join(long miliseconds): waits for a thread to die for  the specified miliseconds. 6.    public int getPriority(): returns the priority of the thread. 7.    public int setPriority(int priority): changes the priority of the thread. 8.    public String getName(): returns the name of the thread. 9.    public void setName(String name): changes the name of the thread. 10.             public Thread currentThread(): returns the reference of  currently executing thread. 11.             public int getId(): returns the id of the thread. 12.             public Thread.State getState(): returns the state of the thread. 13.             public boolean isAlive(): tests if the thread is alive. 14.             public void yield(): causes the currently executing thread  object to temporarily pause and allow other threads to execute. 15.             public void suspend(): is used to suspend the thread(depricated). 16.             public void resume(): is used to resume the suspended             thread(depricated). 17.             public void stop(): is used to stop the thread(depricated). 18.             public boolean isDaemon(): tests if the thread is a daemon thread. 19.             public void setDaemon(boolean b): marks the thread as daemon or user thread. 20.             public void interrupt(): interrupts the thread. 21.             public boolean isInterrupted(): tests if the thread has been interrupted. 22.             public static boolean interrupted(): tests if the current thread has been interrupted.

Runnable interface:

The Runnable interface should be implemented by any class whose instances are intended to be executed by a thread.  Runnable interface have only one method named run().

1.    public void run(): is used to perform action for a thread.

Starting a thread:

start() method of Thread class is used to start a newly created thread.  It performs following tasks: o    A new thread starts(with new callstack). o    The thread moves from New state to the Runnable state. o    When the thread gets a chance to execute, its target run() method will run.

1)   Java Thread Example by extending Thread class

    class Multi extends Thread{  

    public void run(){  

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

}  

    public static void main(String args[]){  

    Multi t1=new Multi();  

     t1.start();  

      }  

}  

   Output:

    thread is running…

2)   Java Thread Example by implementing Runnable interface

      class Multi3 implements Runnable{  

      public void run(){  

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

}  

  

     public static void main(String args[]){  

     Multi3 m1=new Multi3();  

    Thread t1 =new Thread(m1);  

     t1.start();  

    }  

}  

    Output:

     thread is running…