6 · Advanced · lesson 34 of 41

synchronized & Locks

Coordinating access so shared state stays consistent.

Java

class Counter {
    private int n;
    public synchronized void inc() { n++; }
    public synchronized int get() { return n; }
}

// Explicit lock
ReentrantLock lock = new ReentrantLock();
lock.lock();
try { /* critical section */ } finally { lock.unlock(); }

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Key takeaways

✓synchronized guarantees mutual exclusion and visibility.
✓Prefer AtomicInteger / ConcurrentHashMap for simple cases.

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