Question

Can we able to change the name of main thread?
and in main method

Thread t = Thread.currentThread();  
System.out.println(t);

It prints :

Thread[main,5,main]

– here first thread name , second priority, third is thread group to which current thread belongs to.

Is it right?

What is thread group the third parameter?

Answer 1

From the Javadoc for Thread

public final void setName(String name)

Changes the name of this thread to be equal to the argument name.

and

public String toString()

Returns a string representation of this thread, including the thread’s name, priority, and thread group.

---

Thread t = Thread.currentThread();
System.out.println(t);
t.setName("new thread name");
System.out.println(t);

prints

Thread[main,5,main]
Thread[new thread name,5,main]

To change the ThreadGroup’s name you could use reflection but that’s unlikely to be a good idea.