Multithreading Practice Programs

title: Multithreading Programs description: Multithreading ke practice programs

1. Odd-Even using two threads

class OddEven { static int N = 10; static int count = 1; static final Object lock = new Object(); static void printOdd() { while (count <= N) { synchronized (lock) { if (count % 2 != 0) { System.out.println("Odd: " + count++); lock.notify(); } else { try { lock.wait(); } catch (InterruptedException e) { } } } } } static void printEven() { while (count <= N) { synchronized (lock) { if (count % 2 == 0) { System.out.println("Even: " + count++); lock.notify(); } else { try { lock.wait(); } catch (InterruptedException e) { } } } } } public static void main(String[] args) { new Thread(OddEven::printOdd).start(); new Thread(OddEven::printEven).start(); } }

2. Thread-safe Singleton

java exampleWoHoTech

class Singleton {
    private static volatile Singleton instance;

    private Singleton() { }

    public static Singleton getInstance() {
        if (instance == null) {
            synchronized (Singleton.class) {
                if (instance == null)
                    instance = new Singleton();
            }
        }
        return instance;
    }
}

3. Parallel sum using threads

int[] arr = new int[1000]; for (int i = 0; i < arr.length; i++) arr[i] = i + 1; AtomicLong totalSum = new AtomicLong(0); int chunkSize = 250; List<Thread> threads = new ArrayList<>(); for (int i = 0; i < 4; i++) { final int start = i * chunkSize; final int end = start + chunkSize; Thread t = new Thread(() -> { long sum = 0; for (int j = start; j < end; j++) sum += arr[j]; totalSum.addAndGet(sum); }); threads.add(t); t.start(); } for (Thread t : threads) t.join(); System.out.println("Total: " + totalSum.get()); // 500500

title: Multithreading Programs description: Multithreading ke practice programs

1. Odd-Even using two threads

2. Thread-safe Singleton

java exampleWoHoTech

class Singleton {
    private static volatile Singleton instance;

    private Singleton() { }

    public static Singleton getInstance() {
        if (instance == null) {
            synchronized (Singleton.class) {
                if (instance == null)
                    instance = new Singleton();
            }
        }
        return instance;
    }
}

Multithreading Practice Programs

1. Odd-Even using two threads

2. Thread-safe Singleton

3. Parallel sum using threads

Continue learning this concept

Multithreading Practice Programs

1. Odd-Even using two threads

2. Thread-safe Singleton

3. Parallel sum using threads

Continue learning this concept