A thread in Java is the smallest unit of execution within a process. It allows multiple tasks to run concurrently within the same application, helping improve responsiveness and resource utilization.
Key Points: • A thread represents an independent path of execution in a program. • Multiple threads can run concurrently within a single process. • Threads share the same memory space, making communication between them efficient. • Java provides multithreading support through the Thread class and Runnable interface. • Proper synchronization is required when multiple threads access shared resources. • Multithreading improves application performance for tasks such as background processing, file handling, and asynchronous operations.
Example: In a banking application, one thread can process transactions while another generates account statements, allowing both tasks to run simultaneously without blocking each other.
Code Example:
class MyTask implements Runnable {
@Override
public void run() {
System.out.println("Thread is running...");
}
}
public class Demo {
public static void main(String[] args) {
Thread thread = new Thread(new MyTask());
thread.start();
}
}Interview Tip: A concise interview answer is:
"A thread is the smallest unit of execution in Java that enables concurrent task processing within a program. Java supports multithreading through the Thread class and Runnable interface, allowing applications to perform multiple tasks efficiently while sharing the same memory space."