public?class?SynchronizedDemo2?{

	private?boolean?ready?=?false;
	private?int?result?=?0;
	private?int?number?=?1;

	public?synchronized?void?write()?{
		ready?=?true;
		number?=?2;
	}

	public?synchronized?void?read()?{
		if?(ready)?{
			result?=?number?*?3;
		}
		System.out.println("result="?+?result);
	}

	private?class?ReadWriteThread?extends?Thread?{
		private?boolean?flag;

		public?ReadWriteThread(boolean?flag)?{
			this.flag?=?flag;
		}

		@Override
		public?void?run()?{
			if?(flag)?{
				write();
			}?else?{
				read();
			}
		}

	}

	public?static?void?main(String[]?args)?{

		for?(int?i?=?0;?i?<?5000;?i++)?{
			SynchronizedDemo2?demo?=?new?SynchronizedDemo2();
			demo.new?ReadWriteThread(true).start();
			demo.new?ReadWriteThread(false).start();
		}

	}

}