The Java™ Tutorials
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Concurrency in Swing
Trail: Creating a GUI With Swing

Lesson: Concurrency in Swing

Examples Index

This lesson discusses concurrency as it applies to Swing programming. It assumes that you are already familiar with the content of the Concurrency lesson in the Essential Java Classes trail.

Careful use of concurrency is particularly important to the Swing programmer. A well-written Swing program uses concurrency to create a user interface that never "freezes" — the program is always responsive to user interaction, no matter what it's doing. To create a responsive program, the programmer must learn how the Swing framework employs threads.

A Swing programmer deals with the following kinds of threads:

The programmer does not need to provide code that explicitly creates these threads: they are provided by the runtime or the Swing framework. The programmer's job is to utilize these threads to create a responsive, maintainable Swing program.

Like any other program running on the Java platform, a Swing program can create additional threads and thread pools, using the tools described in the Concurrency lesson. But for basic Swing programs the threads described here are sufficient.

This lesson discusses each of the three kinds of threads in turn. Worker threads require the most discussion because tasks that run on them are created using javax.swing.SwingWorker. This class has many useful features, including communication and coordination between worker thread tasks and the tasks on other threads.

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