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Anonymous type has shorter lambda alternative

Reports anonymous classes which could be transformed to a constructor or a factory method call with a lambda expression argument.

The following classes are reported by this inspection:

  • Anonymous classes extending ThreadLocal which have an initialValue() method (can be replaced with ThreadLocal.withInitial)

  • Anonymous classes extending Thread which have a run() method (can be replaced with new Thread(Runnable)


new Thread() { @Override public void run() { System.out.println("Hello from thread!"); } }.start();

After the quick-fix is applied:

new Thread(() -> { System.out.println("Hello from thread!"); }).start();

Locating this inspection


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

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 | Java language level migration aids | Java 8

This inspection depends on the Java feature 'ThreadLocal.withInitial()' which is available since Java 8.


By default bundled with

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin

Java, 241.18072

Last modified: 18 June 2024