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How can I add a List to the JLabel?

I'm writing Java game right now, I have a problem that I have a List which type is Ranking, with the fields name and score, and I would like to add that fields to the JLabel. Method setText() unfortunately doesn't fix. What should I do?

with the fields name and score
A JLabel is not designed to display multiple lines of text.
You can format the text using HTML.
Or I would suggest a better approach is to use a JTable, which is designed to display data in a row/column format.
Read the section from the Swing tutorial on How to Use Tables for more information and working examples.
I have a List which type is Ranking
You may also want to check out Row Table Model for an example of a custom TableModel show how you can display your Ranking object in a table.

Best way to show results with a list of options

I am trying to make a "Oregon Trail" like game with JAVA for my Computer Science class. It's all going well so far, but I would like some suggestions on ways of doing the following:
The words at the bottom "Health", "Stats", etc are buttons. I was wondering what the best way of making those buttons present information would be. Is there a way I could show them in that information in one of the bottom squares, and when a different button is clicked change the info to that one? Or would it be best to have popup frames to display the information?

IMHO, I'd go with display the content or info of the button in the panels above.
It keeps the information together in a single place and generally makes it easier to manage, no disappearing windows behind other windows for example.
You have any number of options depending on the information you want to display. You could simply use a none editable JTextArea if the information is just text, or a JList if you want to list items if the data is more structured, a JTable and even a JTree if you want to group the data into some kind of groupable hierarchy.
You could use combinations of each, based on your needs

Best way to implement a selection box from a large number of entries

I have a large set of data from which the user has to select one. I'm thinking of a way to implement it (of course, in a GUI). I have a few ideas. But just thought of posting here as there may be better alternatives..
Say, user has to select a name from a large set of user base. If I simply put a text field for user to enter the name, then there can be issues like entering same name in different formats, misspelling etc...
I see two options here
Using a combo box
Using a list (Actually i'm thinking of something like a tool tip. As I cant show the whole list always due to space issues)
But combo box won't be much user friendly i guess. As the user will have to scroll around the whole list to select an entry. If the number of entries are too large, this will be
Which means, now I'm left only one option. A popping up list, which will change the content according the text user is entering in the text field. So he can type first few letters and the list will show all the entries starting from the entered text. Got my point, right?
Are there any other better to achieve this kind of need?
If I'm going to implement above, what will be the best way to follow. I'm thinking of extending the JTextField to add required functionality. Well, I'll put some method to set the popup list entries. And I'll add some actionListner to watch the text field, and control the popup list accordingly...

Autocomplete is what you are probably looking for. Google for "java swing jcombobox autocomplete" and limit results for the last couple of years to get relevant results. There will be a lot of examples and ideas on how to implement this with custom code.
I believe there is also some custom libraries like "swingx" that provide at least partial or full implementations to save time.
http://swingx.java.net/
They have released code as recently as the beginning of this years so it appears active and might have what you need.

You could take a look at SwingLab's autocomplete feature, it allows you to attach it to a JCombBox, JList or JTextComponent

use AutoComplete JComboBox/JTextField
based on Standard Java Classes
no issue with larger sets of data
no issue with Focus, BackSpace Key, Caret
for better performance to required sort the array before use
simple workaround for setStrict(true/false), restrict input to array

Autocomplete TextField in swing

I am doing a small project for restaurant billing.In the billing form when the user enters the item ,i need the list of possible items to be displayed from which the user can select the appropriate item and all the details of the selected item should be filled in the table. ( just like a super market billing). The items are stored in the database (MySQL) and i am using java swing for user interface
Can anyone please suggest some way for achieving my requirement.Some helpful links as well. ThankYou..

You can use auto-complete package

You can use Swingx.Contains extensions to the Swing GUI toolkit, including new and enhanced components that provide functionality commonly required by rich client applications. Highlights include:
Sorting, filtering, highlighting for tables, trees, and lists
Find/search
Auto-completion
Login/authentication framework
TreeTable component
Collapsible panel component
Date picker component
Tip-of-the-Day component

Java Thumbnail View

Hey i want to create a thumbnail viewer, for my app, i want something similar to this.
I was wondering if there is a pre-existing component that can display thumbnails (FREE), or i was considering to use a JTable, with a custom cell renderer.
What do you think, what would be the best way.
It will be used to display images, keep in mind that i must be able to select individual and multiple files to perform actions on them.
thx in advance.

A JList would probably be better than a JTable. You can use a "horizontal wrap" style. You can always create a custom renderer for the list as well.