JFileChooser - Specifying the files to be open e.g. java, txt etc

How do I specify the files that I want to open using JFileChooser?
I know that the following code specifies all files
jFileChooser1.setFileSelectionMode( jFileChooser1.FILES_ONLY);
but I want my GUI only to allow .java and .txt files. Can somebody please help?

"How to Use File Choosers":
http://java.sun.com/docs/books/tutorial/uiswing/components/filechooser.html
Pay extra attention to the section "Filtering the List of Files".

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JFileChooser - Specifying the files to be open e.g. java, txt etc

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