Code Example of Threads in Java

Programming & Development / April 14, 2025

Code Example of Threads in Java

Java threads multithreading example thread class run method thread sleep thread join concurrent programming thread lifecycle thread synchronization Java concurrency

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Below is a simple Java code example demonstrating how to create and run multiple threads concurrently. Each thread will print a series of numbers with a short delay to mimic real-world tasks.

Java Code:

java

class NumberPrinter extends Thread {
    private int start;

    public NumberPrinter(int start) {
        this.start = start;
    }

    @Override
    public void run() {
        for (int i = start; i <= start + 5; i++) {
            System.out.println(Thread.currentThread().getName() + ": " + i);
            try {
                Thread.sleep(500); // Simulate delay
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

public class ThreadExample {
    public static void main(String[] args) {
        // Creating thread instances
        NumberPrinter thread1 = new NumberPrinter(1);
        NumberPrinter thread2 = new NumberPrinter(100);

        // Starting threads
        thread1.start();
        thread2.start();

        System.out.println("Main thread continues...");

        // Optional: wait for threads to complete
        try {
            thread1.join();
            thread2.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        System.out.println("Main thread finished.");
    }
}

Explanation:

Extending Thread: The NumberPrinter class extends Thread and overrides the run() method to define the task.
Creating Threads: Two thread objects (thread1, thread2) are created, each printing a different range of numbers.
Concurrent Execution: The start() method triggers concurrent execution of both threads.
Sleep: Thread.sleep(500) is used to simulate a task delay.
Join: join() ensures the main thread waits for other threads to finish before terminating.

This example provides a foundational understanding of how threads work in Java. You can expand on it to include synchronization, Runnable interface, or thread pools as you build more advanced applications.

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