Program/Source Code:

The source code to check thread is alive or not is given below. The given program is compiled and executed successfully.

// Java program to check thread is 
// alive or not

class MyThread implements Runnable {
  public void run() {
    try {
      System.out.println("Thread is running.");
    } catch (Exception e) {

    }
  }
}

public class Main {
  public static void main(String[] args) {
    Thread t = new Thread(new MyThread());

    System.out.println("Thread isAlive: " + t.isAlive());
    t.start();
    System.out.println("Thread isAlive: " + t.isAlive());
  }
}

Output:

Thread isAlive: false
Thread is running.
Thread isAlive: true

Explanation:

In the above program, we created two classes MyThread and Main. We created MyThread class by implementing the Runnable interface.

The Main class contains a main() method. The main() method is the entry point for the program. Here, we created a thread and check thread is alive or not using the isAlive() method. The isAlive() method returns the boolean value. It returns true, if the thread is alive otherwise it returns false.