Summary of Chapter 2

 

• The Java AWT supplies a number of interface component classes. These include the Label, Button, Checkbox, Choice, Listbox, Canvas, TextField, TextArea and ScrollPanel classes.

• FlowLayout, GridLayout and BorderLayout managers can be used for different layout policies.

• The Component class is at the root of the AWT hierarchy and all of its attributes and methods are inherited by all other classes.

• The Component foreground, background and font attribute values are inherited via the instance hierarchy.

• The MenuComponent hierarchy supplies the objects which can be used to construct menus.

• A popup menu has the advantage of saving screen space but has the disadvantage of not having any obvious indication of its presence.

• Applications should, in general, register event listeners with its components and should not explicitly enable and process events.

• An application can be its own listener object by registering itself with its included components.

• Extended components should, in general, explicitly enable and process their own events.

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Exercises for Chapter 2

2.13 The ScrollPane class

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