The Java development tools contribute the following views to the workbench.
The Packages view that is shown by default in the Java perspective shows the Java element hierarchy of the Java projects in your workbench. It provides you with a Java-specific view of the resources shown in the Navigator. The element hierarchy is derived from the project's build class paths.
For each project, its source folders and referenced libraries are shown in the tree. You can open and browse the contents of both internal and external JAR files.
The Type Hierarchy view offers three different ways to look at a class hierarchy: