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I had found that answer:
Bad practice.
· User unfriendly: The user sees multiple icons in their task bar when expecting to see only one. Plus the side effects of the coding problems..
· A nightmare to code and maintain:
1. A modal dialog offers the easy opportunity to focus attention on the content of that dialog - choose/fix/cancel this, then proceed. Multiple frames do not.
2. A dialog (or floating tool-bar) with a parent will come to front when the parent is clicked on - you'd have to implement that in frames if that was the desired behavior.
There are many number of ways of displaying many elements in one GUI, e.g.:
· CardLayout (short demo.). Good for:
1. Showing wizard like dialogs.
2. Displaying list, tree etc. selections for items that have an associated component.
3. Flipping between no component and visible component.
· JInternalFrame/JDesktopPane typically used for an MDI.
· JTabbedPane for groups of components.
· JSplitPane A way to display two components of which the importance between one or the other (the size) varies according to what the user is doing.
· JLayeredPane far many well ..layered components.
· JToolBar typically contains groups of actions or controls. Can be dragged around the GUI, or off it entirely according to user need. As mentioned above, will minimize/restore according to the parent doing so.
· As items in a JList (simple example below).
· As nodes in a JTree.
