Introduction
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
![Fig-1.jpg]()
Example 2
In this example we use the Runnale 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
![Fig-2.jpg]()
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
![fig-3.jpg]()
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
![Fig-4.jpg]()
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
![fig-5.jpg]()