singlespooler.java

源码为科学出版社出版的英文<java设计模式>(影印版)所用的所有例子程序

public class singleSpooler
{
   static public void main(String argv[])
   {
      Spooler pr1, pr2;
      //open one printer--this should always work
      System.out.println("Opening one spooler");
      try{
      pr1 = new Spooler();
      }
      catch (SingletonException e)
      {System.out.println(e.getMessage());}
      //try to open another printer --should fail
      System.out.println("Opening two spoolers");
      try{
      pr2 = new Spooler();
      }
      catch (SingletonException e)
      {System.out.println(e.getMessage());}
   }
}