Perform Single And Multiple Task Using Multiple-Thread In Java

Multithreading in Java

 

This article explains how to perform a single and multiple tasks using multiple threads.

 

Performing single task

 

If we need to perform a single task using multiple threads then we need to use only one/single run() method.

 

Example

 

In this example, we simply extend the thread and perform a single task using multiple threads.

class MultithreadEx1 extends Thread
{
    public void run()
    {
        System.out.println("Start task one");
    }
    public static void main(String args[])
    {
        MultithreadEx1 th1 = new MultithreadEx1();
        MultithreadEx1 th2 = new MultithreadEx1();
        MultithreadEx1 th3 = new MultithreadEx1();
        th1.start();
        th2.start();
        th3.start();
    }
}

Output

 

 

Example 2

 

In this example we use the Runnable interface instead of extending threads.

class MultithreadEx2 implements Runnable
{
    public void run()
    {
        System.out.println("Start task one");
    }
    public static void main(String args[])
    {
        Thread th1 = new Thread(new MultithreadEx2());
        Thread th2 = new Thread(new MultithreadEx2());
        Thread th3 = new Thread(new MultithreadEx2());
        th1.start();
        th2.start();
        th3.start();
    }
}

Output

 

 

Performing multiple tasks

 

To perform multiple tasks by multiple threads, we need to use multiple run() methods.

 

Example 1

 

In this example; we need to extend the thread to perform multiple tasks.

class MultithreadEx3 extends Thread
{
    public void run()
    {
        System.out.println("Start task one");
    }
}
class MultithreadEx4 extends Thread
{
    public void run()
    {
        System.out.println("Start task two");
    }
}
class Run
{
    public static void main(String args[])
    {
        MultithreadEx3 th1 = new MultithreadEx3();
        MultithreadEx4 th2 = new MultithreadEx4();
        th1.start();
        th2.start();
    }
}

Output

 

 

Example 2

 

In this example, we use an anonymous class that extends the Thread class.

class Check
{
    public static void main(String[] args)
    {
        Thread th1 = new Thread()
        {
            public void run()
            {
                System.out.println("Start task one");
            }
        };
        Thread th2 = new Thread()
        {
            public void run()
            {
                System.out.println("Start task two");
            }
        };
        th1.start();
        th2.start();
    }
}

Output

 

 

Example 3

 

In this example, we use an anonymous class that implements the Runnable interface.

class Check1
{
    public static void main(String[] args)
    {
        Runnable run1 = new Runnable()
        {
            public void run()
            {
                System.out.println("Start task one");
            }
        };
        Runnable run2 = new Runnable()
        {
            public void run()
            {
                System.out.println("Start task two");
            }
        };
        Thread th1 = new Thread(run1);
        Thread th2 = new Thread(run2);
        th1.start();
        th2.start();
    }
}

Output