The Build command performs an incremental build that compiles all resources modified since the last build. To trigger an incremental build, either:
You can also incrementally build single projects. Select the project that you want to build and:
To clean and rebuild all workbench resources that have an associated builder (e.g. Java projects), select Project > Clean... from the menu bar. Then select Clean all projects and press OK.
To clean and rebuild all resources contained in one or multiple projects:
or
Building a Java program
Building automatically
Working with build paths
Adding a JAR file to the build path
Adding a library folder to the build path
Viewing and editing a project's build path