Change Class Signature
The Change Class Signature refactoring lets you turn a class into a generic and manipulate its type parameters. The refactoring automatically corrects all calls, implementations and overridings of the class.
- The type parameters can have bounds extending other constructs including other type parameters from another class. For instance, the code like
public class ClassA<T, E>can be easily transformed to
public class ClassA<T, E extends T>. However, if the parameter order was initially
public class ClassA<E, T>, the Change Class Signature refactoring may be useful for changing the parameter order in the class signature as well as in all its usages.
- IntelliJ IDEA can successfully deal with rather complicated cases and can alter parameters and corresponding usages if one parameter depends on another.
Changing a class signature
To change a class signature, follow these steps
- In the editor, place the cursor within the name of the class whose signature you want to change.
- Do one of the following:
- Press Ctrl+F6.
- Choose Refactor | Change Signature in the main menu.
- Select Refactor | Change Signature from the context menu.
- In the Change Class Signature dialog, use the available controls to manage the formal type parameters:
- To add a new parameter, click or press Alt+Insert. Specify the parameter name and default type in the Name and the Default Value fields respectively.
- To remove a parameter, select the parameter and click (Alt+Delete).
- To move a parameter up or down in the list, select the parameter and then use (Alt+Up) or (Alt+Down).
- To perform the refactoring right away, click Refactor.
To see the expected changes and make the necessary adjustments prior to actually performing the refactoring, click Preview.