Saturday, November 10, 2018

Java Concurrency - How To Create A Thread

Greetings!

It is easy to create a thread in Java using 2 well known methods.
  • extends Thread class.
  • implement Runnable interface.
Then we create a Thread object and start it! It is as simple as that.


public class ExtendThread extends Thread {
    
    @Override
    public void run() {
        System.out.println("hello from extended thread");
    }
    
}


Thread thread = new ExtendThread();
thread.start();



public class ImplmentedRunnable implements Runnable {

    @Override
    public void run() {
        System.out.println("hello from runnable implementation");
    }
    
}



Thread thread = new Thread(new ImplmentedRunnable());
thread.start();


In Java 8;

Thread thread = new Thread(() -> System.out.println("hello from java 8"));
thread.start();



  • It is not a good practice to extend the Thread class.


Thread states.

A thread exist in several states.
New - when we create an instance of Thread class it is in New state.
Running - when we call start()
Suspended -
Blocked -
Terminated -



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