A build command compiles workbench resources. A build command can be triggered in different ways:
Building automatically: If auto build is turned on (Window > Preferences > Perform build automatically on resource modification), then an incremental build occurs every time you save a modified workbench resource.
Building manually: You can perform a manual build using a keyboard shortcut, a project's pop-up menu or the Project menu in the menu bar.
Adding a JAR file to the build path
Adding a library folder to the build path
Building automatically
Building manually
Viewing and editing a project's build path
Working with build paths
Java Build Path
Project menu
Compiler preferences
