How do you use ReadWriteLock with a simple code example?

In Java, a ReadWriteLock is part of the java.util.concurrent.locks package, and it allows multiple threads to read a resource simultaneously while providing exclusive access to a single thread for writing. This is useful when a resource is read frequently but modified infrequently.

Below is a simple example of using ReadWriteLock:


        import java.util.concurrent.locks.ReadWriteLock;
        import java.util.concurrent.locks.ReentrantReadWriteLock;

        public class ReadWriteLockExample {
            private final ReadWriteLock rwLock = new ReentrantReadWriteLock();
            private String sharedResource = "Initial Value";

            public String read() {
                rwLock.readLock().lock();
                try {
                    return sharedResource;
                } finally {
                    rwLock.readLock().unlock();
                }
            }

            public void write(String newValue) {
                rwLock.writeLock().lock();
                try {
                    sharedResource = newValue;
                } finally {
                    rwLock.writeLock().unlock();
                }
            }

            public static void main(String[] args) {
                ReadWriteLockExample example = new ReadWriteLockExample();

                // Start reader threads
                Runnable reader = () -> {
                    System.out.println("Read: " + example.read());
                };

                // Start writer thread
                Runnable writer = () -> {
                    example.write("New Value");
                    System.out.println("Wrote: New Value");
                };

                Thread writerThread = new Thread(writer);
                Thread readerThread1 = new Thread(reader);
                Thread readerThread2 = new Thread(reader);
                
                writerThread.start();
                readerThread1.start();
                readerThread2.start();
            }
        }

How do you use ReadWriteLock with a simple code example?

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How do you use ReadWriteLock with a simple code example?

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