Lambda can be replaced with anonymous class

Reports lambda expressions that can be replaced with anonymous classes.

Expanding lambda expressions to anonymous classes may be useful if you need to implement other methods inside an anonymous class.

Example:

s -> System.out.println(s)

After the quick-fix is applied:

new Consumer<String>() {
  @Override
  public void accept(String s) {
    System.out.println(s);
  }
}

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.

LambdaCanBeReplacedWithAnonymous

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.

Settings or Preferences | Editor | Inspections | Java | Code style issues

This inspection depends on the Java feature 'Lambda expressions', which is available since Java 8.

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection LambdaCanBeReplacedWithAnonymous

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

IntelliJ IDEA 2025.2

Inspection Details
By default bundled with:	IntelliJ IDEA 2025.2, Qodana for JVM 2025.2,

Last modified: 18 September 2025