What is Multithreading in Java? Explain the concept and advantages. Java में Multithreading क्या है? Concept और advantages explain करें।

Multithreading is executing multiple threads simultaneously within a single process. A thread is a lightweight sub-process that shares memory with other threads but has its own execution path and stack.

// Multithreading Example
public class MultiThreadingDemo {
    public static void main(String[] args) {
        // Create threads
        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 5; i++) {
                System.out.println('Thread 1: ' + i);
            }
        });
        
        Thread t2 = new Thread(() -> {
            for (int i = 0; i < 5; i++) {
                System.out.println('Thread 2: ' + i);
            }
        });
        
        // Start threads (not run)
        t1.start();
        t2.start();
        // Both threads execute simultaneously
    }
}

// Advantages of Multithreading:
// 1. Responsiveness - UI stays responsive
// 2. Resource sharing - threads share memory
// 3. Economy - thread creation is cheaper than processes
// 4. Scalability - better CPU utilization
// 5. Concurrent execution - tasks run in parallel
// 6. Better performance - on multi-core systems