End Thread Execution

1) Using Boolean flag:

In this method, we declare one boolean variable called flag in a thread. Initially we set this flag as true. Keep the task to be performed in while loop inside the run() method by passing this flag. This will make thread continue to run until flag becomes false. We have defined stopRunning() method. This method will set the flag as false and stops the thread. Whenever you want to stop the thread, just call this method. Also notice that we have declared flag as volatile. This will make thread to read its value from the main memory, thus making sure that thread always gets its updated value.

class MyThread extends Thread
{
	//Initially setting the flag as true
	
	private volatile boolean flag = true;
	
	//This method will set flag as false
	
	public void stopRunning()
	{
		flag = false;
	}
	
	@Override
	public void run()
	{
		//Keep the task in while loop
		
		//This will make thread continue to run until flag becomes false
		
		while (flag)
		{
			System.out.println("I am running....");
		}
		
		System.out.println("Stopped Running....");
	}
}

public class MainClass 
{   
	public static void main(String[] args) 
	{
		MyThread thread = new MyThread();
		
		thread.start();
		
		try 
		{
			Thread.sleep(100);
		} 
		catch (InterruptedException e) 
		{
			e.printStackTrace();
		}
		
		//call stopRunning() method whenever you want to stop a thread
		
		thread.stopRunning();
	}	
}

Output :
I am running….
I am running….
I am running….
I am running….
I am running….
I am running….
I am running….
Stopped Running….

2) By calling interrupt() method

In this method, we use interrupt() method to stop a thread. Whenever you call interrupt() method on a thread, it sets the interrupted status of a thread. This status can be obtained by interrupted() method. This status is used in a while loop to stop a thread.

class MyThread extends Thread
{	
	@Override
	public void run()
	{
		while (!Thread.interrupted())
		{
			System.out.println("I am running....");
		}
		
		System.out.println("Stopped Running.....");
	}
}

public class MainClass 
{   
	public static void main(String[] args) 
	{
		MyThread thread = new MyThread();
		
		thread.start();
		
		try 
		{
			Thread.sleep(100);
		} 
		catch (InterruptedException e) 
		{
			e.printStackTrace();
		}
		
		//interrupting the thread
		
		thread.interrupt();
	}	
}

Output :
I am running….
I am running….
I am running….
I am running….
I am running….
I am running….
I am running….
Stopped Running….