Refactoring Source Code
IntelliJ IDEA offers a wide variety of code refactorings, which track down and correct the affected code references automatically.
In this part you will find:
To perform refactoring, follow these general steps
Select a symbol or code fragment to refactor. The set of available refactorings depends
on your selection. You can select symbols in the following IntelliJ IDEA components:
- Project view
- Structure tool window
- UML Class diagram
- Do one of the following:
- In the dialog box that opens, specify the refactoring options.
- To apply the changes immediately, depending on the refactoring type, click Refactor or OK.
For certain refactorings, there is an option of previewing the changes prior to
actually performing the refactoring. In such cases the
buttons is available in the corresponding dialog.
To preview the potential changes and make the necessary adjustments, click Preview. IntelliJ IDEA displays the changes that are going to be made on a dedicated tab of the Find tool window.
One of the possible actions at this step is to exclude certain entries from the refactoring. To do so, select the desired entry in the list and press Delete.
If conflicts are expected after the refactoring, IntelliJ IDEA displays a dialog with a brief description of the encountered problems. If this is the case, do one of the following:
- Ignore the conflicts by clicking the Continue button. As a result, the refactoring will be performed, however, this may lead to erroneous results.
- Preview the conflicts by clicking the Show in View button. IntelliJ IDEA shows all conflicting entries on the Conflicts tab in the Find tool window, enabling you to navigate to the problematic lines of code and to make the necessary fixes.
- Cancel the refactoring and return to the editor.
- When you are satisfied with the proposed results, click Do Refactor to apply the changes.
IntelliJ IDEA provides the following common refactorings:
- Change Class Signature
- Change Signature
- Convert Anonymous to Inner
- Convert to Instance Method
- Encapsulate Fields
- Extract Delegate
- Extract Include File
- Extract Interface
- Extract Method
- Extract Method Object
- Extract Parameter Object
- Extract Superclass
- Generify Refactoring
- Extract Constant
- Extract Field
- Extract Functional Parameter
- Extract Parameter
- Extract Property
- Extract Variable
- Invert Boolean
- Make Class Static
- Make Method Static
- Move Refactorings
- Pull Members up
- Push Members down
- Remove Middleman
- Rename Refactorings
- Replace Constructor with Builder
- Replace Constructor with Factory Method
- Replace Inheritance with Delegation
- Replace Method Code Duplicates
- Replace Temp with Query
- Safe Delete
- Type Migration
- Use Interface Where Possible
- Wrap Return Value
The following language-specific refactorings are available: