From fe36cbe99ff442efbce129430aca8f31ab3a4c7e Mon Sep 17 00:00:00 2001
From: Mikhail Pyltsin <Mikhail.Pyltsin@jetbrains.com>
Date: Wed, 24 Sep 2025 13:09:25 +0200
Subject: [PATCH] [java-generation] IJ-CR-176380 IDEA-372740 ConcurrentMap
 implementation must override putIfAbsent, but that method is not in the
 Override Methods screen, nor Implement Methods

- simplification

GitOrigin-RevId: c15b9f8891695bab89b51ca5fab629f096d41a41
---
 .../generation/OverrideImplementExploreUtil.java         | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/java/java-psi-impl/src/com/intellij/codeInsight/generation/OverrideImplementExploreUtil.java b/java/java-psi-impl/src/com/intellij/codeInsight/generation/OverrideImplementExploreUtil.java
index f06a6bd9ba3a..59c9bdb07bd7 100644
--- a/java/java-psi-impl/src/com/intellij/codeInsight/generation/OverrideImplementExploreUtil.java
+++ b/java/java-psi-impl/src/com/intellij/codeInsight/generation/OverrideImplementExploreUtil.java
@@ -116,14 +116,7 @@ public class OverrideImplementExploreUtil {
     HashMap<String, List<HierarchicalMethodSignature>> nameToSignature = new HashMap<>();
     for (HierarchicalMethodSignature signature : sigs) {
       String name = signature.getMethod().getName();
-      List<HierarchicalMethodSignature> previousSignatures = nameToSignature.get(name);
-      if (previousSignatures == null) {
-        List<HierarchicalMethodSignature> list = new ArrayList<>();
-        list.add(signature);
-        nameToSignature.put(name, list);
-        signatures.add(signature);
-        continue;
-      }
+      List<HierarchicalMethodSignature> previousSignatures = nameToSignature.computeIfAbsent(name, n -> new ArrayList<>());
       boolean addToList = true;
       for (HierarchicalMethodSignature previousSignature : previousSignatures) {
         if (!MethodSignatureUtil.areSignaturesErasureEqual(signature, previousSignature)) continue;