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)

Example:

  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

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.

AnonymousHasLambdaAlternative

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 'ThreadLocal.withInitial()' which is available since Java 8.

Last modified: 18 June 2024