java如何返回多个值,如何让Java方法返回多个值？

I was just wondering whether there's a way to make a Java method return multiple values.

I'm creating an application that uses the jdbc library to work with a database. I can successfully enter values into the database but I need a way to return them, and this is where I'm a bit stuck. I creating a form into which the user enters a specific value (an ID number) which is then passed to by Database class which carries out my database work.

Database newQuery = new Database();

newQuery.getCust(c_ID); //uses the GetCust method in my class,

//passing it the ID of the customer.

The getCust() method in my Database class creates the following query:

ResultSet Customer = stat.executeQuery("SELECT * FROM Persons WHERE Cust_ID=C_ID");

I need a way to return the results that are stored in Customer back. Any ideas?

解决方案

You can't exactly return multiple values from a method in Java, but you can always return a container object that holds several values. In your case, the easiest thing to do would be to return the ResultSet, Customer.

If you're concerned about exposing your data layer to your UI, you can copy the data from the ResultSet into a structure that is less specific to the database, either a List of Maps, or perhaps a List of Customer objects, where Custom is a new class that represents your business entity.