IntelliJ IDEA 2023.1 Help

Extract field

The Extract Field refactoring lets you declare a new field and initialize it with the selected expression. The original expression is replaced with the usage of the field.

Extract a field in place

  1. Position the caret within a piece of code you want to extract into a field.

  2. Press Control+Alt+F or from the main menu, select Refactor | Extract Field.

  3. Select an expression you want to introduce as a field.

    Select an expression

    If IntelliJ IDEA detects more than one occurrence in your code, it lets you specify which occurrences to replace.

    Extract multiple occurrences of a field

    You can press Control+Alt+F twice to open the Extract Field dialog where you can specify additional details, such as visibility options, or options for initializing your variable.

    Extract field dialog


Let's extract the anotherClass.intValue(); variable into a field. As a result, IntelliJ IDEA changes the selected variable name to number and declares it as the private int number field.



public class Class { AnotherClass anotherClass; public void method() { int a = 1; int b = a + anotherClass.intValue(); int c = b + anotherClass.intValue(); } }
public class Class { public AnotherClass anotherClass; private int number; public void method() { int a = 1; number = anotherClass.intValue(); int b = a + number; int c = b + number; } }
Last modified: 21 July 2022