What is a thread in Java?

A thread in Java is the smallest unit of execution within a process. It allows a program to perform multiple tasks concurrently, improving responsiveness and better utilizing system resources.

Key Points: • A thread represents an independent path of execution within a program. • Multiple threads can run concurrently within the same application. • Multithreading improves application performance by utilizing CPU resources efficiently. • Threads share the same memory space but execute independently. • Java provides thread creation through the Thread class and Runnable interface.

Example: In a web application, one thread may process a user request while another thread handles database operations simultaneously, improving overall responsiveness.

Code Example:

class MyThread extends Thread {

    @Override
    public void run() {
        System.out.println("Thread is running");
    }
}

public class Main {

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

Interview Tip: A concise interview answer is:

"A thread is the smallest unit of execution in Java. It enables concurrent execution of tasks within a process, allowing applications to perform multiple operations simultaneously and utilize system resources more efficiently."