A. Public class getClass（）
B. Public Object getSource（）
C. Public Component getSource（）
D. Public Component getTarget（）
E. Public Component getComponent（）
F. Public Component getTargetComponent（）

A. A flow layout can be used to position a component that should resize horizontally when the  container is resized.
B. A grid layout can be used to position a component tat should maintain a constant size even when  the container is resized.
C. A border layout can be used to position component that should maintain a constant size even when  the container is resized.
D. The grid bag layout can be used to give a grid-like layout which differs from the normal grid in that individual rows and columns can have unique sizes.
E. If two components are placed in the same column of a grid bag layout， and one component resizes horizontally， then the other component must resize horizontally.