生产者－消费者问题

public class MyStack { public static void main(String[] args) { MyStack ms = new MyStack(); Thread producer = ms.new ProducerThread(ms); Thread consumer = ms.new ConsumerThread(ms); producer.start(); consumer.start(); producer = ms.new ProducerThread(ms); producer.start(); } private char[] cs = new char[6]; private int index = 0; class ProducerThread extends Thread { private MyStack s; public ProducerThread(MyStack s) { this.s = s; } public void run() { for (char c = 'A'; c <= 'Z'; c++) { s.push(c); try { sleep(20); } catch (InterruptedException e) { e.printStackTrace(); } s.print(); } } } class ConsumerThread extends Thread { private MyStack s; public ConsumerThread(MyStack s) { this.s = s; } public void run() { for (int i = 0; i < 52; i++) { s.pop(); try { sleep(40); } catch (InterruptedException e) { e.printStackTrace(); } s.print(); } } } private synchronized void push(char c) { while (index == 6) { try { wait(); } catch (InterruptedException e) { e.printStackTrace(); } } cs[index] = c; System.out.println(cs[index++] + " push"); } private synchronized void pop() { while (index == 0) { try { wait(); } catch (InterruptedException e) { e.printStackTrace(); } } System.out.println(cs[--index] + " pop"); notify(); cs[index] = '\0'; } private void print() { for (int i = 0; i < index; i++) { System.out.print(cs[i] + "\t"); } System.out.println(); } }