Java package in package?

问题:

I'm using eclipse 3.8 indigo and I don't know why, when I'm creating a new package the destination of the new package goes outside. I want to create new packages within a package: package in package. I tried to copy / paste the newly created package or to move, but it just copies.

For example, I want to create different packages: dialogs, views, tables, etc. in my main source package. For example:

com.new.application // this is the the main package created by wizard
com.new.application.view // package that contains all views.

回答1:

In reality there is no such thing as a sub-package in Java - each package is a completely separate entity, with the names being seemingly hierarchical only for convenience. For example, items with default visibility are not visible in sub-packages, despite what one might expect.

If your problem has more to do with presentation and aesthetics than substance, then perhaps what you are looking for is the hierarchical package presentation setting in the Eclipse Package Explorer: click on the little downward triangle/arrow at the top right of the package explorer and select "Hierarchical" in the "Package presentation" submenu:

This is a global setting and will affect all your opened/un-opened projects.

回答2:

There is no concept of package with in package. Each package is separate namespace. I think if you go to folder view instead of package view, there you may see one under another.

回答3:

The eclipse package explorer has two view options: flat or hierarchical. You are probably in the flat view (which is the default, who knows why). Change the view to hierarchical by clicking on the small triangle on the top right corner of the package view and then changing the package representation.