title: How can I import a java swing class into the GUI builder of intellij?
body: <p>I have a eclipse project with some swing GUI form in it, and now I want to try IntelliJ for this project.
  Those swing forms were built under window builder plugin in eclipse, and I've only got one single *.java file.</p>
  
  <p>Is there any plugin I can use to modify these swing forms under IntelliJ?</p>