src/java.base/share/classes/java/text/MergeCollation.java

rev 52979 : 8215281: Use String.isEmpty() when applicable in java.base
Reviewed-by: TBD

@@ -90,11 +90,11 @@
         PatternEntry tmp = null;
         ArrayList<PatternEntry> extList = null;
         int i;
         for (i = 0; i < patterns.size(); ++i) {
             PatternEntry entry = patterns.get(i);
-            if (entry.extension.length() != 0) {
+            if (!entry.extension.isEmpty()) {
                 if (extList == null)
                     extList = new ArrayList<>();
                 extList.add(entry);
             } else {
                 if (extList != null) {

@@ -120,11 +120,11 @@
     }
 
     private final PatternEntry findLastWithNoExtension(int i) {
         for (--i;i >= 0; --i) {
             PatternEntry entry = patterns.get(i);
-            if (entry.extension.length() == 0) {
+            if (entry.extension.isEmpty()) {
                 return entry;
             }
         }
         return null;
     }