Java 8

'Collections.sort()' can be replaced with 'List.sort()': Reports calls of Collections.sort(list, comparator) which can be replaced with list.sort(comparator).
'Comparator' combinator can be used: Reports Comparator instances defined as lambda expressions that could be expressed using Comparator.comparing() calls.
Anonymous type can be replaced with lambda: Reports anonymous classes which can be replaced with lambda expressions.
Anonymous type can be replaced with method reference: Reports anonymous classes which can be replaced with method references.
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.
Expression can be folded into Stream chain: Reports expressions with a repeating pattern that could be replaced with Stream API or a String.join() call.
Guava pseudo-functional call can be converted to Stream API call: Reports usages of Guava pseudo-functional code when Java Stream API is available.
Guava's functional primitives can be replaced with Java: Reports usages of Guava's functional primitives that can be migrated to standard Java API calls.
Lambda can be replaced with method call: Reports lambda expressions which can be replaced with a call to a JDK method.
Lambda can be replaced with method reference: Reports lambdas that can be replaced with method references.
Loop can be collapsed with Stream API: Reports loops which can be replaced with stream API calls using lambda expressions.
Loop can be replaced with 'Collection.removeIf()': Reports loops which can be collapsed into a single Collection.removeIf() call.
Loop can be replaced with 'List.replaceAll()': Reports loops which can be collapsed into a single List.replaceAll() call.
Map.forEach() can be used: Suggests replacing for(Entry<?,?> entry : map.entrySet()) {...} or map.entrySet().forEach(entry -> ...) with map.forEach((key, value) -> ...).
Simplifiable 'Map' operations: Reports common usage patterns of java.util.Map and suggests replacing them with: getOrDefault(), computeIfAbsent(), putIfAbsent(), merge(), or replaceAll().
Simplifiable forEach() call: Reports forEach() calls that can be replaced with a more concise method or from which intermediate steps can be extracted.
Standard 'hashCode()' method can be used: Reports bitwise operations that can be replaced with a call to the Long.hashCode() or Double.hashCode() methods.
Statement lambda can be replaced with expression lambda: Reports lambda expressions with code block bodies when expression-style bodies can be used instead.

01 April 2025