Pattern variable can be used

Reports local variable declarations that can be replaced with pattern variables, which are usually more compact.

Example:

  if (obj instanceof String) {
    String str = (String) obj;
    System.out.println(str);
  }

Can be replaced with:

  if (obj instanceof String str) {
    System.out.println(str);
  }

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

PatternVariableCanBeUsed

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

This inspection depends on the Java feature 'Patterns in 'instanceof'', which is available since Java 16.

New in 2020.1

Here you can find the description of settings available for the Pattern variable can be used inspection, and the reference of their default values.

Report cast expressions which can be replaced with new introduced pattern variables: Not selected

Inspection Details
By default bundled with:	IntelliJ IDEA 2024.3, Qodana for JVM 2024.3,
Can be installed with plugin:	Java, 243.26483

01 April 2025