# Introduce Local Extension Dialog Box

Use to add logic when you cannot modify the original source code. Select a class method in the Source Editor and choose Refactor > Introduce Local Extension to open the Introduce Local Extension dialog box.

Element | Description
--- | ---
Introduce Local Extension for | (read-only) Displays the name of the source class that needs an additional method but cannot be modified.
New Name | Specifies the name of an extension class being created.
Project | Specifies the project in which the extension class is created.
Location | Specifies the folder where you want to store the created extension class.
To Package | Specifies the name of the package where the generated extension class is housed.
Type | Provides the following extension class options to use:
Wrapper | Makes the extension class a wrapper of the original class, which keeps the original instance in one of its private fields.
Subtype | Makes the extension class a subclass of the original class, which uses the extension keyword.
Equality | Provides the following options to set how the equals and `hashCode` methods are handled:
Delegate | Delegates to the `equals` and `hashCode` methods of the original class.
Generate | Generates new `equals` and `hashCode` methods using the IDE code generator.
Separate | Separates the `equals` method into two. A new method is added to check if the original class equals the extension class. The Equality field is disabled when Subtype is chosen in the Type field.
Replace original usages with the extension | Replaces all usages of the original class with the new local extension class.

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