diff --git a/java/java-impl/src/com/intellij/refactoring/introduceVariable/IntroduceVariableBase.java b/java/java-impl/src/com/intellij/refactoring/introduceVariable/IntroduceVariableBase.java
index 31c1550e4755..b1bfd9002c43 100644
--- a/java/java-impl/src/com/intellij/refactoring/introduceVariable/IntroduceVariableBase.java
+++ b/java/java-impl/src/com/intellij/refactoring/introduceVariable/IntroduceVariableBase.java
@@ -185,9 +185,9 @@ public abstract class IntroduceVariableBase extends IntroduceHandlerBase {
     }
   }
 
-  public static boolean isChooserNeeded(List<? extends PsiExpression> exprs) {
-    if (exprs.size() == 1) {
-      final PsiExpression expression = exprs.get(0);
+  public static boolean isChooserNeeded(List<? extends PsiExpression> expressions) {
+    if (expressions.size() == 1) {
+      final PsiExpression expression = expressions.get(0);
       return expression instanceof PsiNewExpression && ((PsiNewExpression)expression).getAnonymousClass() != null;
     }
     return true;
@@ -816,7 +816,7 @@ public abstract class IntroduceVariableBase extends IntroduceHandlerBase {
       }
       if (containerParent instanceof PsiLambdaExpression) {
         PsiParameter[] parameters = ((PsiLambdaExpression)containerParent).getParameterList().getParameters();
-        if (Arrays.stream(parameters).anyMatch(parameter -> vars.contains(parameter))) {
+        if (Arrays.stream(parameters).anyMatch(vars::contains)) {
           break;
         }
       }
@@ -1115,12 +1115,12 @@ public abstract class IntroduceVariableBase extends IntroduceHandlerBase {
       LOG.assertTrue(parentRange.getStartOffset() <= rangeMarker.getStartOffset(), parent + "; prefix:" + prefix + "; suffix:" + suffix);
       String beg = allText.substring(parentRange.getStartOffset(), rangeMarker.getStartOffset());
       //noinspection SSBasedInspection (suggested replacement breaks behavior)
-      if (StringUtil.stripQuotesAroundValue(beg).trim().length() == 0 && prefix == null) beg = "";
+      if (StringUtil.stripQuotesAroundValue(beg).trim().isEmpty() && prefix == null) beg = "";
 
       LOG.assertTrue(rangeMarker.getEndOffset() <= parentRange.getEndOffset(), parent + "; prefix:" + prefix + "; suffix:" + suffix);
       String end = allText.substring(rangeMarker.getEndOffset(), parentRange.getEndOffset());
       //noinspection SSBasedInspection (suggested replacement breaks behavior)
-      if (StringUtil.stripQuotesAroundValue(end).trim().length() == 0 && suffix == null) end = "";
+      if (StringUtil.stripQuotesAroundValue(end).trim().isEmpty() && suffix == null) end = "";
 
       final String start = beg + (prefix != null ? prefix : "");
       refIdx[0] = start.length();