Running a Java program over and over.........

Question

I'm new to java development, so forgive me if this is the wrong forum, or just a stupid question. What I have is a java program that reads messages from an IBM MQseries queue using the MQseries AMI interface, makes a connection to an oracle database, and inserts those messages into a table in the database. What I need, however, is for the program to run over and over, checking the queue for messages, and sending them to the database. How do I get this java program to constantly run. Also, when it runs the first time, I need to make a connection to the oracle database, grab some information from a table, and stick it into a java array. I only need this done once. Is there an init() method or something I can put this code in so it will only be done once?

Answer 1

Information that needs to only be run once can be done two ways.
1) Inside a constructor. This code will run each time you instantiate an object.
2) Inside a static block. Runs once, and only once, regardless of how many instances are created
Here's the example of both.
public class Foo
    static
        System.out.println("I'm in the static block");
    public Foo()
        System.out.println("I'm in the constructor");
}Also, check out java.util.Timer for scheduling tasks to reoccur at regular intervals.