Layout Manager

When you add() buttons (and other components) to a content pane, a layout manager automatically decides what size they will be and where they will go. This is convenient, because you can add components without worrying about the details. The layout manager is like a little artist inside the computer. You say what components you want and the layout manager lays them out in the picture.

The layout manager sometimes makes odd choices. However, there are several kinds of layout managers. Each layout manager has a different style of positioning components within the container. Usually there is a layout that will do the job you want. If you don't specify otherwise a default layout manager is used.