A layout manager manages the layout of a Container
which is part of an application's
GUI.
Usually the container is the content pane of a frame or dialog
or any panel in the
content pane's container hierarchy. The layout manager calculates
the positions and sizes of all components of the container it
manages and sets the appropriate properties of each component
to the calculated values. The look as a part of the
look-&-feel of the container is determined
by its layout manager.
Complex frames and dialogs often contain more than one panel; the contained panels theirselfs can also contain panels and so on. Usually each panel has its own layout manager. The panels could use the same type of layout manager which is rather seldom but in most cases different types of layout managers are used to manage the layout of a frame or dialog. This way complex layouts can be achieved.
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