Teach Yourself Java in 21 Days

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P2/V4SQC6    TY  Java in 21 Days   030-4    louisa  12.31.95

   FM   LP#4

Day

10

Simple Animation and Threads

173

Creating Animation in Java .................................................................... 174

Painting and Repainting .................................................................... 174

Starting and Stopping

an Applet’s Execution ...................................................................... 175

Putting It Together ............................................................................ 175

Threads: What They Are

and Why You Need Them ................................................................... 177

The Problem with the Digital Clock Applet ...................................... 178

Writing Applets with Threads ............................................................ 179

Fixing The Digital Clock ................................................................... 180

Reducing Animation Flicker ................................................................... 182

Flicker and How to Avoid It .............................................................. 182

How to Override Update ................................................................... 183

Solution One: Don’t Clear the Screen ............................................... 183

Solution Two: Redraw

Only What You Have To ................................................................ 186

Summary ................................................................................................ 192

Q&A ...................................................................................................... 192