public class LockedExample {
	private final ReadWriteLock lock = new ReentrantReadWriteLock();
	private final Lock baseLock = new ReentrantLock();
	private int value = 0;
	
	public int getValue() {
		this.lock.readLock().lock();
		try {
			return value;
		} finally {
			this.lock.readLock().unlock();
		}
	}
	
	public void setValue(int newValue) {
		this.lock.writeLock().lock();
		try {
			value = newValue;
		} finally {
			this.lock.writeLock().unlock();
		}
	}
	
	public void foo() {
		this.baseLock.lock();
		try {
			System.out.println("bar");
		} finally {
			this.baseLock.unlock();
		}
	}
}