How to create thread

There are two ways to create a thread:

  1. By extending Thread class
  2. By implementing Runnable interface.

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:

  • Thread()
  • Thread(String name)
  • Thread(Runnable r)
  • 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:
  • A new thread starts(with new callstack).
  • The thread moves from New state to the Runnable state.
  • When the thread gets a chance to execute, its target run() method will run.

1) Java Thread Example by extending Thread class

Output:thread is running...

2) Java Thread Example by implementing Runnable interface

Output:thread is running...
If you are not extending the Thread class,your class object would not be treated as a thread object.So you need to explicitely create Thread class object.We are passing the object of your class that implements Runnable so that your class run() method may execute.
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