public class Resource
{
	private Boolean available;

	public Resource() 
	{
		super();
		this.available = true;
	}
	
	public synchronized void acquire()
	{
		if (!this.available)
		{
			try 
			{
				this.available.wait();
			} 
			catch (InterruptedException e) 
			{
				e.printStackTrace();
			}
		}
		this.available = false;
	}
	
	public synchronized void release()
	{
		this.available.notify();
		this.available = true;
	}
}