Sams Teach Yourself Java™ in 24 Hours (Covering Java 7 and Android)

ptg7068951

186 HOUR 13:Building a Simple User Interface

Quiz

1. Which user component is used as a container to hold other
   components?
   A. Tu p p e r Wa r e
   B. JPanel
   C. Choice


2. Which of the following must be done first within a container?
   A. Establish a layout manager.
   B. Add components.
   C. Doesn’t matter.


3. What method determines how components are arranged within a container?
   A. setLayout()
   B. setLayoutManager()
   C. setVisible()

Answers

1. B.JPanel. You can add components to the panel and then add the
   panel to another container such as a frame.


2. A.Yo u m u s t s p e c i f y t h e l ay o u t m a n a g e r b e f o r e t h e c o m p o n e n t s s o y o u
   can add them in the correct way.


3. A.ThesetLayout()method takes one argument: the layout manager
   object that has the job of deciding where components should be dis-
   played.

Activities

To i n t e r f a c e f u r t h e r w i t h t h e s u b j e c t o f G U I d e s i g n ,undertake the following

activities:

. Modify the SalutonFrameapplication so that it displays “Saluton
Mondo!” in the frame’s main area instead of the title bar.
. Create a frame that contains another frame and make both of them visi-
ble at the same time.

To s e e J av a p r o g r a m s t h a t i m p l e m e n t t h e s e a c t i v i t i e s ,visit the book’s website

at http://www.java24hours.com.