How to Make Threads with Java

All the 3 methods to make threads have been discussed. The main benefit of thread is it can run even if your method has completed its function. It can be useful in a number of situations like you want to perform 2 operation at similar time etc.

Threads actually run even if your main function has ended .It run independent of others.You are going to require threads in your day to day java programs.

Listing 1: Define Class and the main method

public class Threads 
{
public static void main(String args[])
{
	MainThread t=new MainThread();
	t.start();
	
	Thread t1=new Thread(new Runn());
	t1.start();
	
	Thread t2 = new Thread(){
	    public void run(){
	      System.out.println("Anonymous");  
	    }
	  };
	  t2.start();
}
}
 

Here,

1. We made a class named Thread.
2. Now we discuss the first method of defining thread.
3. We make an object of a class called MainThread(We will define it later) .This MainThread class extends the thread functionality
4. Now we will start the thread by calling the start method. When we call the start method on thread then the run method of the MainThread is called and executed
5. Now we discuss the second method of defining thread.
6. We define a class call Runn which will implement the Runnable interface and override its run method(We will define it later).Now we make an object of thread and pass the Runn class which implemented the Runnable interface.
7. Now when we call the start method then the run method of Runn class gets called and is executed
8. Now we discuss the third method of defining thread.
9. Here we define an anonymous thread i.e. we give thread definition along with declaration.
10. Here we define a thread and give the definition of the run method there only.
11. Now we call the start method of this anonymous thread so that the run method gets called

Now we define the MainThread class

Listing 2: MainThread class

class MainThread extends Thread
{
	public void run()
	{
		System.out.println("Hi you reached MainThread");
	}
}

Here,

1. We made a class named MainThread and we extend the thread class so as to avail the thread facility.
2. Now we will define the run method and we put a simple message so that when this thread run then the message is displayed

Now we define the Runn class

Listing 3: Runn class

class Runn implements Runnable
{

	public void run() 
	{
		System.out.println("Runnable interface");
	}
	
} 

Here,

1. We made a class named Runn and we implement the Runnable interface so as to avail the thread facility.
2. Now we will define the run method and we put a simple message so that when this thread run then the message is displayed

Listing 4: Full Source code

class MainThread extends Thread
{
	public void run()
	{
		System.out.println("Hi you reached MainThread");
	}
}

class Runn implements Runnable
{

	public void run() 
	{
		System.out.println("Runnable interface");
	}
	
}
public class Threads 
{
public static void main(String args[])
{
	MainThread t=new MainThread();
	t.start();
	
	Thread t1=new Thread(new Runn());
	t1.start();
	
	Thread t2 = new Thread(){
	    public void run(){
	      System.out.println("Anonymous");  
	    }
	  };
	  t2.start();
}
}

 

Output

Hi you reached MainThread
Runnable interface
Anonymous