Display thread's information in Java

Java 8Object Oriented ProgrammingProgramming

In order to get the name of the Thread, we use the getName() method in Java. This method returns the name of the thread.

Declaration − The java.lang.Thread.getName() method is declared as follows −

public String getName()

In order to get the identity of the Thread, we use the getId() method in Java. This method returns the identifier of the thread. The thread ID is a positive long number produced during the creation of the thread.

Declaration − The java.lang.Thread.getId() method is declared as follows −

public long getId()

In order to get the state of the Thread, we use the getState() method in Java. This method returns the state of the thread.The thread state is designed for keeping a check on the state of the system and not for control of synchronization.

Declaration − The java.lang.Thread.getState() method is declared as follows −

public Thread.state getState()

In order to get the status of the Thread, we use the isAlive() method in Java. This method checks whether the thread is alive. A thread is said to be alive if it has started and has not terminated.

Declaration − The java.lang.Thread.isAlive() method is declared as follows −

public final boolean isAlive()

Let us see an example to get the information of the thread −

Example

 Live Demo

public class Example extends Thread {
   public void run() {
      for (int k = 0; k <= 5; k++) {
         print();
       }
   }
   public void print() {
      Thread t = Thread.currentThread();
      String name = t.getName();
      long id = t.getId();
      boolean status = t.isAlive();
      Thread.State state = t.getState();
      System.out.print("Thread name = " + name);
      System.out.print(" Thread ID = " + id);
      System.out.print(" Thread State = " + state);
      System.out.println(" Thread Status = " + status);
   }
   public static void main(String[] args) {
      Example e = new Example();
      e.start(); // calls the run method
      for (int i = 0; i <= 5; i++) {
         e.print();
      }
   }
}

Output

Thread name = main  Thread ID = 1 Thread State = RUNNABLE  Thread Status = true
Thread name = main  Thread ID = 1 Thread State = RUNNABLE  Thread Status = true
Thread name = main  Thread ID = 1 Thread State = RUNNABLE  Thread Status = true
Thread name = main  Thread ID = 1 Thread State = RUNNABLE  Thread Status = true
Thread name = main  Thread ID = 1 Thread State = RUNNABLE  Thread Status = true
Thread name = main  Thread ID = 1 Thread State = RUNNABLE  Thread Status = true
Thread name = Thread-0  Thread ID = 21 Thread State = RUNNABLE  Thread Status = true
Thread name = Thread-0  Thread ID = 21 Thread State = RUNNABLE  Thread Status = true
Thread name = Thread-0  Thread ID = 21 Thread State = RUNNABLE  Thread Status = true
Thread name = Thread-0  Thread ID = 21 Thread State = RUNNABLE  Thread Status = true
Thread name = Thread-0  Thread ID = 21 Thread State = RUNNABLE  Thread Status = true
Thread name = Thread-0  Thread ID = 21 Thread State = RUNNABLE  Thread Status = true
raja
Published on 08-Jan-2019 10:20:55
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