IntelliJ IDEA 13.1.0 Web Help

Refactor | Use Interface Where Possible

Item Description
Change usages Select the parent class or interface, which will replace the usages of the current class.
Use interface/superclass in instanceof If this option is checked, IntelliJ IDEA scans the source code for the presence of the instanceof statements for the selected superclass or interface, and change it, if found.

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