How to change the Eclipse default workspace?

If you mean "change workspace" go to File -> Switch Workspace

I took this question to mean how can you change the Default workspace so that when Eclipse boots up the workspace you want is automatically loaded:

Go under preferences then type "workspace" in the search box provided to filter the list. Alternatively you can go to General>Startup and Shutdown>Workspaces.
There you can set a flag to make Eclipse prompt you to select a workspace at startup by checking the "Prompt for workspace at startup" checkbox.
You can set the number of previous workspaces to remember also. Finally there is a list of recent workspaces. If you just remove all but the one you want Eclipse will automatically startup with that workspace.

Go to eclipse\configuration\
Open the file "config.ini"
Modify the line
```
osgi.instance.area.default="F:/Workspace/Java"
```
where "F:/Workspace/Java" should be your default workspace!

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