I did a quick topic look, but did not find something similar.
My query is: how can I prevent a child window appearing on the Windows taskbar when it is shown?
You need to use a JDialog instead of a JFrame
JDK 1.7 brings you method setType. Use following method.
JFrame.setType(javax.swing.JFrame.Type.UTILITY)
来源:https://stackoverflow.com/questions/2694782/remove-a-jframe-from-taskbar-in-java