Teach Yourself Java in 21 Days

Day

13

The Java Abstract Windowing Toolkit

237

An AWT Overview................................................................................. 238

The Basic User Interface Components .................................................... 240

Labels ................................................................................................ 241

Buttons .............................................................................................. 242

Checkboxes ........................................................................................ 243

Radio Buttons .................................................................................... 244

Choice Menus ................................................................................... 245

Text Fields ......................................................................................... 247

Panels and Layout ................................................................................... 249

Layout Managers ............................................................................... 249

Insets ................................................................................................. 254

Handling UI Actions and Events ............................................................ 255

Nesting Panels and Components ............................................................ 258

Nested Panels .................................................................................... 258

Events and Nested Panels .................................................................. 258

More UI Components ............................................................................ 259

Text Areas .......................................................................................... 259

Scrolling Lists .................................................................................... 261

Scrollbars and Sliders ......................................................................... 262

Canvases ............................................................................................ 265

More UI Events ...................................................................................... 265

A Complete Example:

RGB to HSB Converter ....................................................................... 266

Create the Applet Layout ................................................................... 267

Create the Panel Layout ..................................................................... 267

Define the Subpanels ......................................................................... 269

Handle the Actions ............................................................................ 272

Update the Result .............................................................................. 272

The Complete Source Code ............................................................... 274

Summary ................................................................................................ 277

Q&A ...................................................................................................... 277