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Method/constructor references are more compact and readable than using lambdas, and are therefore preferred.

Noncompliant Code Example
  List list = new ArrayList();
  list.add(0);
  list.add(1);
  list.add(2);

    list.forEach(n -> { System.out.println(n); });


Compliant Solution
  List list = new ArrayList();
  list.add(0);
  list.add(1);
  list.add(2);

  list.forEach(System.out::println);