Multithreading Creating a Thread in JAVA

How to create a thread in java

we have two ways to creating a thread in java

1. Using Thread Class
2. Using Runnable Interface

When we use thread class : we have methods and constructor and we can used.click here

When we use Runnable interface :  only one method : run();

Creating a thread using Extending Thread Class : 

public class All extends Thread {

    public void run(){

        System.out.println("Thread is running using thread class");

    }

    public static void main(String[] args)

    {

        All all=new All();

        all.run();

    }

}

Output : 

Creating a thread using Runnable Interface : 

class A1 implements Runnable

{

    public void run(){

        System.out.println("Thread is running using runnable interface");

    }

    public static void main(String[] args)

    {

        A1 a1=new A1();

        Thread t1=new Thread(a1);

        t1.start();

    }

}

Output : 

Note  : We cannot run a thread twice if we doing this exception are thrown (IllegalThreadStateException)

Example : 

class TwiceThread extends Thread{

    public void run(){

        System.out.println("Never run twice thread");

    }

    public static void main(String[] args) {

        TwiceThread t1=new TwiceThread();

        t1.start();

        t1.start();

    }

}

Output : 

// t1.start() first time execute

//t1.start() second time execute

Next : Click here for Methods in Multithreading

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