reader.java

读者与写者之JAVA

public class Reader extends Thread
{
   public Reader(int r, Database db)
   {
      readerNum = r;
      server = db;
   }

   public void run()
   {
   int c;

     while (true)
      {
       //System.out.println("reader " + readerNum + " is sleeping.");
       Database.napping();

       System.out.println("reader " + readerNum + " wants to read.");
       c = server.startRead();
   
       // you have access to read from the database
       System.out.println("reader " + readerNum + " is reading. Reader Count = " + c);
       Database.napping();

       System.out.print("reader " + readerNum + " is done reading. ");
       
       c = server.endRead();
       //System.out.println("reader " + readerNum + " is done reading. Count = " + c);
      }
   }
   
   private Database	server;
   private int       readerNum;
}