The workspace is the physical location (file path) you are working in. You can choose the workspace during startup of eclipse or via the menu (File-> Switch Workspace-> Others). All your projects, sources files, images and other artifacts will be stored and saved in your workspace.

You can predefine the workspace via the startup parameter -data path_to_workspace, e.g. "c:\eclipse.exe -data "c:\temp" Please note that you have to put the path name into brackets. To see the current workspace directory in the title of Eclipse use -showLocation as additional parameter.

A perspective is a visual container for a set of views and editors. You can change the layout within a perspective (close / open views, editors, change the size, change the position, etc.). Eclipse allow you to switch to another perspective via the menu Window->Open Perspective -> Other. For Java development you usually use the "Java Perspective".

A view is typically used to navigate a hierarchy of information or to open an editor. Changes in a view are directly applied to the underlying data structure. Editors are used to modify elements. Editors can have code completion, undo / redo, etc. To apply the changes in an editor to the underlying resources, e.g. Java source file, you usually have to save.