Perform Single And Multiple Task Using Multiple-Thread In Java

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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