摘要：
class Single { private static Single s=null; private Single(){} public static Single getInstance() { if(s==null) { synchronized(Single.class) {... 阅读全文
摘要：
public class TicketDemo { public static void main(String[] args) { Ticket t=new Ticket(); Thread t1=new Thread(t); t1.setName("One--"); t1.start(); T... 阅读全文