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public class PC{   public static void main (String [] args)   {      Shared s = new Shared ();      new Producer (s).start ();      new Consumer (s).start ();   }}class Shared{   private char c = '\u0000';   private boolean writeable = true;   synchronized void setSharedChar (char c)   {      while (!writeable)         try         {            wait ();         }         catch (InterruptedException e) {}      this.c = c;      writeable = false;      notify ();   }   synchronized char getSharedChar ()   {      while (writeable)         try         {            wait ();         }         catch (InterruptedException e) { }      writeable = true;      notify ();      return c;   }}class Producer extends Thread{   private Shared s;   Producer (Shared s)   {      this.s = s;   }   public void run ()   {      for (char ch = 'A'; ch <= 'Z'; ch++)      {           s.setSharedChar (ch);           System.out.println (ch + " produced by "                               + "producer.");      }   }}class Consumer extends Thread{   private Shared s;   Consumer (Shared s)   {      this.s = s;   }   public void run ()   {      char ch;      do      {         ch = s.getSharedChar ();         System.out.println (ch + " consumed by "                             + "consumer.");      }      while (ch != 'Z');   }}