How to edit this

Download a Developer Program such as Eclipse copy and paste that text into a new project and customize the messages,

and then extract it and then put it into your plugin folder.

 

The "Developer programs" that you talk about are called IDEs

The Class BukkitRunnable should work for you

Code (Text):

new BukkitRunable(){
   @Override
   Public void run(){
       //Run this code later
   }
}.runTaskLater(JavaPlugin, ticks);

Ticks being the number of seconds later multiplied by 20

 

Ahh yes. Thank you!

 

U can use Java-JDK too