I did some searches, but I could not find anything specific that answers my questions. I wanted to know the difference between them and the pros and cons of each.
GroupLayout, developed for the NetBeans Matisse GUI builder, was added in Java SE 6. If you are using an earlier version of the JDK, you need the original custom library (not the javax.swing-package).
Also see: http://wiki.netbeans.org/FaqFormSwingLayoutLibrary
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