SellTicket.java
package maipiao; public class SellTicket implements Runnable { private static int tickets = 100; private Object obj = new Object(); private int x = 0; @Override public void run() { while (true) { if (x % 2 == 0) { // 加锁操作 // synchronized (obj) { // synchronized (this) { // 静态方法 synchronized (SellTicket.class) { if (tickets > 0) { try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(Thread.currentThread().getName() + "正在出售第" + tickets + "张票"); tickets--; } } } else { sellTicket(); } x++; } } private static synchronized void sellTicket() { if (tickets > 0) { try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(Thread.currentThread().getName() + "正在出售第" + tickets + "张票"); tickets--; } } }
SellTicketDemo.java
package maipiao; public class SellTicketDemo { public static void main(String[] args) { SellTicket st=new SellTicket(); Thread t1=new Thread(st,"窗口1"); Thread t2=new Thread(st,"窗口2"); Thread t3=new Thread(st,"窗口3"); // 启动线程 t1.start(); t2.start(); t3.start(); } }