The best replacement for jframe is jdialog.

The best alternatives to jframe are rated as following:
★★★★★  jdialog
★★★★★  japplet
★★★★★  jpanel
★★★★  jwindow
★★★★  applet
★★★★  frame
★★  application window
★  joptionpane
★  jdesktoppane
★  applet java
  jform

Your alternative for jframe is not listed? Suggest!
Speaking about jframe, one probably shouldn't forget about jpanel.

Other search terms related to jframe and their ratings are:
★★★★★ jpanel
You have in mind a companion for jframe and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of jframe in all years. Click on graph for more.
jframe
jdialog
japplet