Let's take a look at the description javadoc javax.swing.Popup in: Popups are used to display a Component to the user, typically on top of all the other Components in a particular containment hierarchy Popups have a very small life cycle Once.. You Have Obtained A Popup, And Hidden It (Invoked The Hide Method), You Should No Longer Invoke Any Methods on It. This Allows The PopupFactory to Cache Popups for Later USE.
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You Typically Do Not Explicitly Create An Instance of Popup, Instead Obtain One from a popupfactory.
It is roughly that popup can display a component on the top floor of the window. Generally speaking, it is only a short life cycle ... and it is recommended to use PopupFactory to get an instance.
a typical usage of Popup is that tooltip you can see from Tooltip's source code.
Here is a simple example: popup mypopup = popupfactory.getsharedInstance (). GetPopup (Frame, New Jlabel ("PopupWindow", POSX, POSY); MyPopup.show (); This can only be placed on the screen with only one label Any position. Often use, when mouse movement, some temporary information, etc.
