Java Threads - simple example

Why does the following code display 'Processes completed: 500000' or 'Processes completed: 499999' instead of 'Processes completed: 0'  ?

And very occasionally the output is just:
A
B
In this case why is the string 'FINISHED!' not printed?

Thanks


public class Test {

      public static void main(String[] args)  {
            
            Server other = new Server();
            other.start();
            synchronized(other) {
                  try {
                        other.wait();
                        System.out.println("Processes completed:" + other.processCount);
                  } catch (InterruptedException ex) {}
            }
            System.out.println("FINISHED!");
      }
      
       static class Server extends Thread {
                  int processCount;
                  public void run() {
                        synchronized(this) {
                              for (int i=0;i<500000;i++) {
                                    processCount = i;
                                    notify();
                              }
                        }
                        System.out.println("A");
                        processCount += 1;
                        System.out.println("B");
                  }
            }
}