protected Popup (Component owner, Component contents, int x, int y)

Creates a Popup for the Component owner containing the Component contents. owner is used to determine which Window the new Popup will parent the Component the Popup creates to. A null owner implies there is no valid parent. x and y specify the preferred initial location to place the Popup at. Based on screen size, or other paramaters, the Popup may not display at x and y.

owner    Component mouse coordinates are relative to, may be null
contents    Contents of the Popup
x    Initial x screen coordinate
y    Initial y screen coordinate

IllegalArgumentException    if contents is null