Lets you optimize the import declarations by either expanding or collapsing them, obsolete or unused imports are removed.

Please note that when using either the Ant, Console or Maven Plug-ins, you have to explicitly enable type repository services for this feature to work. Please refer to the documentation of the individual Plug-ins to learn how one can accomplish this (see Part II, "Plug-ins").

Expand on-demand imports

If enabled, tries to expand all on-demand import declarations.

So the following on-demand import declaration may be expanded into two single-type import declarations that reference the needed types for this package.

import java.util.*;

could become

import java.util.ArrayList;
import java.util.List;

Use custom implementation

The IDE Plug-ins usually leverage the build-in import optimization facility, but sometimes these may contain bugs that prevent there usage. Here, you can enable a custom Jalopy implementation instead. It's the same implementation that is used by the non-IDE Plug-ins (Ant, Console, Maven) by default. Please note that this implementation only supports import expansion!

Since 1.7

Collapse single-type imports

If enabled, tries to collapse all single-type declarations. Collapsing means to remove all single-type imports of a given package and replace them with one on-demand import declaration.

import java.awt.event.MouseEvent;
import javax.swing.JButton;
import javax.swing.JTable;
import javax.swing.JTextField;

could become

import java.awt.event.*;
import javax.swing.*;

Please note that there might be collisions that prevent collapsing when two types have the same name.

import java.awt.Color;
import java.util.List;

In the example above, collapsing both packages is not possible because this would lead to invalid code as both <package>java.awt.</package> and <package>java.util</package> contain a type named List. In such cases only one package will be collapsed (if there are no further conflicts).