Creating a Thread by Implementing Runnable Interface in Java

class Counter implements Runnable {
    // Body of a Class
}

@Override
	public void run() {
		//Body of the Thread
	}

Counter counter1 = new Counter("Counter 1");
Thread t1 = new Thread(counter1);
t1.start();

package usingrunableinterface;

//Define a class that implements the Runnable interface
class Counter implements Runnable {
 private String name;

 public Counter(String name) {
     this.name = name;
 }

 // The run method contains the code that will be executed by the thread
 public void run() {
     for (int i = 1; i <= 5; i++) {
         try {
             // Sleep for a second to simulate work
             Thread.sleep(1000);
         } catch (InterruptedException e) {
             System.out.println(name + " has been interrupted.");
         }
         System.out.println(name + ": " + i);
     }
     System.out.println(name + " has finished counting.");
 }
}

public class ThreadUsingRunnable {
 public static void main(String[] args) {
     // Create instances of the Runnable object
     Counter counter1 = new Counter("Counter 1");
     Counter counter2 = new Counter("Counter 2");

     // Create two threads from those instances
     Thread thread1 = new Thread(counter1);
     Thread thread2 = new Thread(counter2);

     // Start the threads
     thread1.start();
     thread2.start();

     try {
         // Wait for both threads to finish
         thread1.join();
         thread2.join();
     } catch (InterruptedException e) {
         System.out.println("Main thread was interrupted.");
     }
     System.out.println("Main thread has finished.");
 }
}

Counter 2: 1
Counter 1: 1
Counter 1: 2
Counter 2: 2
Counter 2: 3
Counter 1: 3
Counter 1: 4
Counter 2: 4
Counter 2: 5
Counter 1: 5
Counter 2 has finished counting.
Counter 1 has finished counting.
Main thread has finished.

Counter 1: 1
Counter 2: 1
Counter 1: 2
Counter 2: 2
Counter 2: 3
Counter 1: 3
Counter 1: 4
Counter 2: 4
Counter 1: 5
Counter 2: 5
Counter 2 has finished counting.
Counter 1 has finished counting.
Main thread has finished.