The Java development tools (JDT) are a set of extensions to the workbench that allow you to edit, compile, and run Java programs.
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Build classpath
Classpath variables
Debugger
Java builder
Java editor
Java projects
Java perspectives
Java views
Java search
Refactoring support
Scrapbook
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Adding source code as individual files
Creating Java elements
Formatting Java code
Restoring a deleted workbench element
Showing and hiding files
Working with JREs