How to Display all Threads Status in Java?

Last Updated : 23 Jul, 2025

Threads are light-weight processes within a process.. Multithreading in java is a feature that allows concurrent execution of two or more parts of a program to maximize the utilization of CPU. here the approach to retrieve the state of the thread is via getState() method of the Thread class. A java thread can exist in any one of the following states, the status of a thread is the state in which it exists at a given instance. The life cycle of a thread as shown above is the best way out to learn more about the states where the states are as follows:

New
Runnable
Blocked
Waiting
Timed Waiting
Terminated

Note: When a thread is getting executed all other threads are in blocking state and not in waiting state.

Procedure: Displaying thread status

Threads are created by implementing the runnable interface.
The status of a thread can be retrieved by getState() method of the Thread class object.

Example:

Java

// Java Program to Display all Threads Status // Importing Set class from java.util package import java.util.Set; // Class 1 // helper Class implementing Runnable interface class MyThread implements Runnable {  // run() method whenever thread is invoked  public void run()  {  // Try block to check for exceptions  try {  // making thread to  Thread.sleep(2000);  }  // Catch block to handle the exceptions  catch (Exception err) {  // Print the exception  System.out.println(err);  }  } } // Class 2 // Main Class to check thread status public class GFG {  // Main driver method  public static void main(String args[]) throws Exception  {  // Iterating to create multiple threads  // Customly creating 5 threads  for (int thread_num = 0; thread_num < 5;  thread_num++) {  // Creating single thread object  Thread t = new Thread(new MyThread());  // Setting name of the particular thread  // using setName() method  t.setName("MyThread:" + thread_num);  // Starting the current thread  // using start() method  t.start();  }  // Creating set object to hold all the threads where  // Thread.getAllStackTraces().keySet() returns  // all threads including application threads and  // system threads  Set<Thread> threadSet  = Thread.getAllStackTraces().keySet();  // Now, for loop is used to iterate through the  // threadset  for (Thread t : threadSet) {  // Printing the thread status using getState()  // method  System.out.println("Thread :" + t + ":"  + "Thread status : "  + t.getState());  }  } }