How to program my own UPI and OPI?

Question

Hi,
I just want to know how to program my own UPI and OPI. I want to
add some features into the DBMS. Is there some one can answer my
questions, or tell me where to find information? Thanks!
null

Answer 1

Follow the bouncing example
package mil.army.logsa.sandbox.thread;
import java.util.Observable;
import java.util.Observer;
public class RunnableExample implements Observer {
     public static void main(String[] args){
          RunnableExample e = new RunnableExample() ;
          e.exec() ;
     // This is here because you can't reference (this) in the static context of the main method
     private void exec(){
          System.out.println("Launching RunnableExample") ;
          System.out.println("Creating Thing") ;
          Thing t = new Thing(this) ;
          t.start() ;
          System.out.println("Shutting down RunnableExample") ;
     @Override
     public void update(Observable o, Object arg) {
          System.out.println(arg) ;
class Thing extends Thread {
     private ObservableThing obsThing ;
     public Thing(Observer o){
          super() ;
          obsThing = new ObservableThing() ;
          obsThing.addObserver(o) ;
     public void run(){
          System.out.println("Starting Thing") ;
          for(int i=0; i<100; i++){
               obsThing.notifyObservers(i + " is " + (i%2==0 ? "EVEN" : "ODD")) ;
          System.out.println("Thing is finished") ;
class ObservableThing extends Observable{
     public void notifyObservers(Object o){
          setChanged() ;
          super.notifyObservers(o) ;
}PS.