Java等待/通知机制：生产者-消费者问题

/*
*@Author by MXM
*@Authorized by CRPH
*/
class ShareData{
	private char c;
	private boolean writeable=true;//通知变量
	public synchronized void setShareChar(char c){
		if(writeable==false){
			try{
				wait();//未消费等待
			}catch(InterruptedException e){
				this.c=c;
				writeable=false;//标记已经生产
				notify();//通知消费者已经生产，可以消费
			}
		}
	}
	public synchronized char getShareChar(){
		if(writeable){
			try{
				wait();//未生产等待
			}catch(InterruptedException e){
				writeable=true;//标记已经消费
				notify();//通知需要生产	
				return this.c;
			}
		}
		return c ;
	}
}
class Producer extends Thread{//生产者线程
	private ShareData s;
	Producer(ShareData s){
		this.s=s;
	}
	public void run(){
		for(char ch='A';ch<='Z';ch++){
			try{
				Thread.sleep((int)Math.random()*10);
			}catch(InterruptedException e){
				s.setShareChar(ch);
				System.out.println(ch+"is producing!"+"\n");
			}
		}
	}
}
class Consumer extends Thread{//消费者线程
	private ShareData s;
	Consumer(ShareData s){
		this.s=s;
	}
	public void run(){
		char ch = 0;
		do{
			try{
				Thread.sleep((int)Math.random()*10);
			}catch(InterruptedException e){
				ch=s.getShareChar();
				System.out.println(ch+"is consuming!"+"\n");
			}
		}while(ch!='Z');
	}
}
class SynchronizedTest{
	public static void main(String[] args){
		ShareData s=new ShareData();
		new Consumer(s).start();
		new Producer(s).start();
	}
}