mbien commented on code in PR #5173:
URL: https://github.com/apache/netbeans/pull/5173#discussion_r1223859565


##########
java/java.editor.base/src/org/netbeans/modules/java/editor/base/semantic/UnusedDetector.java:
##########
@@ -597,5 +619,49 @@ private void handleDeclaration(TreePath path) {
                 }
             }
         }
+
+        @Override
+        public Void visitLiteral(LiteralTree node, Void p) {
+            if (node.getKind() == Kind.STRING_LITERAL) {
+                allStringLiterals.add((String) ((LiteralTree) 
node).getValue());
+            }
+            return super.visitLiteral(node, p);
+        }
+
+        @Override
+        public Void visitMethodInvocation(MethodInvocationTree node, Void p) {
+            Element invoked = info.getTrees().getElement(new 
TreePath(getCurrentPath(), node.getMethodSelect()));
+            if (invoked != null && invoked.getEnclosingElement() == 
methodHandlesLookup && node.getArguments().size() > 0) {
+                ExpressionTree clazz = node.getArguments().get(0);
+                Element lookupType = null;
+                if (clazz.getKind() == Kind.MEMBER_SELECT) {
+                    MemberSelectTree mst = (MemberSelectTree) clazz;
+                    if (mst.getIdentifier().contentEquals("class")) {
+                        lookupType = info.getTrees().getElement(new 
TreePath(new TreePath(getCurrentPath(), clazz), mst.getExpression()));
+                    }
+                }
+                String lookupName = null;
+                if (node.getArguments().size() > 1) {
+                    ExpressionTree name  = node.getArguments().get(1);
+                    if (name.getKind() == Kind.STRING_LITERAL) {
+                        lookupName = (String) ((LiteralTree) name).getValue();
+                    }
+                }
+                switch (invoked.getSimpleName().toString()) {
+                    case "findStatic": case "findVirtual": case "findSpecial":
+                        type2LookedUpMethods.computeIfAbsent(lookupType, t -> 
new HashSet<>()).add(lookupName);

Review Comment:
   nitpick:
   `type2LookedUpMethods.computeIfAbsent(lookupType, t -> new 
HashSet<>()).add(lookupName);`
   ->
   `type2LookedUpMethods.putIfAbsent(lookupType, new 
HashSet<>()).add(lookupName);`
   potentially clearer?
   (multiple occurrences in file)



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