Creating Threads in Java

Multithreading in Java is a feature that allows concurrent execution of two or more parts of a program to maximize the utilization of the CPU. Each part of such a program is called a thread, and the process of executing multiple threads simultaneously is called multithreading.

Creating Threads in Java

In Java, there are two main ways to create a thread:

  1. By extending the Thread class
  2. By implementing the Runnable interface
Example: Extending the Thread Class

class MyThread extends Thread {
    public void run() {
        for (int i = 0; i < 5; i++) {
            System.out.println(Thread.currentThread().getId() + " Value " + i);
            try {
                Thread.sleep(1000);  // sleep for 1 second
            } catch (InterruptedException e) {
                System.out.println(e);
            }
        }
    }

    public static void main(String[] args) {
        MyThread t1 = new MyThread();
        MyThread t2 = new MyThread();
        t1.start();
        t2.start();
    }
}


Explanation

Extending the Thread class:
  • A class is created that extends Thread.
  • The run() method is overridden to define the code that constitutes the new thread.
  • An instance of the class is created and the start() method is called to begin execution.
Example: Implementing the Runnable Interface

class MyRunnable implements Runnable {
    public void run() {
        for (int i = 0; i < 5; i++) {
            System.out.println(Thread.currentThread().getId() + " Value " + i);
            try {
                Thread.sleep(1000);  // sleep for 1 second
            } catch (InterruptedException e) {
                System.out.println(e);
            }
        }
    }

    public static void main(String[] args) {
        Thread t1 = new Thread(new MyRunnable());
        Thread t2 = new Thread(new MyRunnable());
        t1.start();
        t2.start();
    }
}

Explanation
Implementing the Runnable interface:
  • A class implements the Runnable interface.
  • The run() method is overridden to define the thread's code.
  • An instance of Thread is created, passing the Runnable instance to the Thread constructor.
  • The start() method is called to begin execution.
In both examples, the run() method contains a loop that prints the current thread's ID and a value, then sleeps for one second to simulate a time-consuming task. The start() method is called on each thread to begin their execution

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