Naming a thread in Java

by Online Tutorials Library July 22, 2022

Naming Thread and Current Thread

Naming Thread

The Thread class provides methods to change and get the name of a thread. By default, each thread has a name, i.e. thread-0, thread-1 and so on. By we can change the name of the thread by using the setName() method. The syntax of setName() and getName() methods are given below:

  public String getName(): is used to return the name of a thread.  public void setName(String name): is used to change the name of a thread.  

We can also set the name of a thread directly when we create a new thread using the constructor of the class.

Example of naming a thread : Using setName() Method

FileName: TestMultiNaming1.java

  class TestMultiNaming1 extends Thread{    public void run(){     System.out.println(“running…”);    }   public static void main(String args[]){    TestMultiNaming1 t1=new TestMultiNaming1();    TestMultiNaming1 t2=new TestMultiNaming1();    System.out.println(“Name of t1:”+t1.getName());    System.out.println(“Name of t2:”+t2.getName());       t1.start();    t2.start();      t1.setName(“Tutor Aspire Team”);    System.out.println(“After changing name of t1:”+t1.getName());   }  }  

Test it Now

Output:

Name of t1:Thread-0  Name of t2:Thread-1  After changing name of t1:Tutor Aspire Team  running...  running...

Example of naming a thread : Without Using setName() Method

One can also set the name of a thread at the time of the creation of a thread, without using the setName() method. Observe the following code.

FileName: ThreadNamingExample.java

  // A Java program that shows how one can   // set the name of a thread at the time  // of creation of the thread    // import statement  import java.io.*;    // The ThreadNameClass is the child class of the class Thread  class ThreadName extends Thread  {    // constructor of the class  ThreadName(String threadName)  {  // invoking the constructor of  // the superclass, which is Thread class.  super(threadName);  }    // overriding the method run()  public void run()  {  System.out.println(” The thread is executing….”);  }  }    public class ThreadNamingExample  {  // main method  public static void main (String argvs[])  {  // creating two threads and settting their name  // using the contructor of the class  ThreadName th1 = new ThreadName(“TutorAspire1”);  ThreadName th2 = new ThreadName(“TutorAspire2”);    // invoking the getName() method to get the names  // of the thread created above  System.out.println(“Thread – 1: ” + th1.getName());  System.out.println(“Thread – 2: ” + th2.getName());      // invoking the start() method on both the threads  th1.start();  th2.start();  }  }  

Output:

Thread - 1: TutorAspire1  Thread - 2: TutorAspire2   The thread is executing....   The thread is executing....

Current Thread

The currentThread() method returns a reference of the currently executing thread.

Example of currentThread() method

FileName: TestMultiNaming2.java

  class TestMultiNaming2 extends Thread{   public void run(){    System.out.println(Thread.currentThread().getName());   }   public static void main(String args[]){    TestMultiNaming2 t1=new TestMultiNaming2();    TestMultiNaming2 t2=new TestMultiNaming2();      t1.start();    t2.start();   }  }  

Test it Now

Output:

Thread-0  Thread-1

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Naming a thread in Java

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Naming Thread

Example of naming a thread : Using setName() Method

Example of naming a thread : Without Using setName() Method

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