What is multithreading in Java with real-time example?

What is multithreading in Java with real-time example?

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Multithreading in Java refers to the ability of a program to execute multiple threads or flows of execution concurrently, improving the overall performance and responsiveness of the application.

Imagine you're a waiter at a busy restaurant. You need to take orders from several tables simultaneously, serve drinks, and deliver food while managing the kitchen staff. Each table is like a separate thread of execution that requires your attention at the same time. To manage this complexity, you would:

In Java, a thread is an entity that can execute code concurrently. You create a new thread by extending the Thread class or implementing the Runnable interface. Threads share the same memory space (heap) but have their own stack and program counter.

Here's a simple example of multithreading in Java:

class HelloThread extends Thread {
public void run() {
for (int i = 0; i < 10; i++) {
System.out.println("Hello from thread " + i);
try {
Thread.sleep(500); // simulate work
} catch (InterruptedException e) { }
}
}
}
public class Main {
public static void main(String[] args) {
HelloThread hello1 = new HelloThread();
HelloThread hello2 = new HelloThread();
hello1.start(); // start thread 1
hello2.start(); // start thread 2
for (int i = 0; i < 10; i++) {
System.out.println("Hello from main " + i);
try {
Thread.sleep(500); // simulate work
} catch (InterruptedException e) { }
}
}
}

In this example, two threads (hello1 and hello2) are created to print messages concurrently. The main thread runs a loop that simulates work by sleeping for 500 milliseconds between each iteration.

When you run the program, you'll see output like:

Hello from thread 0
Hello from main 0
Hello from thread 1
Hello from main 1
...

This illustrates how multiple threads can execute concurrently, improving overall system responsiveness and throughput.

What is multithreading in advance in java with example

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