src/java.base/share/classes/sun/util/locale/LocaleMatcher.java

rev 51919 : 8215281: Use String.isEmpty() when applicable in java.base
Reviewed-by: dfuchs, alanb

@@ -400,11 +400,11 @@
             if (range.equals("*")) {
                 continue;
             }
 
             String rangeForRegex = range.replace("*", "\\p{Alnum}*");
-            while (rangeForRegex.length() > 0) {
+            while (!rangeForRegex.isEmpty()) {
                 for (String tag : tags) {
                     // change to lowercase for case-insensitive matching
                     String lowerCaseTag = tag.toLowerCase(Locale.ROOT);
                     if (lowerCaseTag.matches(rangeForRegex)
                             && !shouldIgnoreLookupMatch(zeroRanges, lowerCaseTag)) {

@@ -435,11 +435,11 @@
             if (range.equals("*")) {
                 continue;
             }
 
             String rangeForRegex = range.replace("*", "\\p{Alnum}*");
-            while (rangeForRegex.length() > 0) {
+            while (!rangeForRegex.isEmpty()) {
                 if (tag.matches(rangeForRegex)) {
                     return true;
                 }
                 // Truncate from the end....
                 rangeForRegex = truncateRange(rangeForRegex);

@@ -589,11 +589,11 @@
     }
 
     private static String[] getEquivalentsForLanguage(String range) {
         String r = range;
 
-        while (r.length() > 0) {
+        while (!r.isEmpty()) {
             if (LocaleEquivalentMaps.singleEquivMap.containsKey(r)) {
                 String equiv = LocaleEquivalentMaps.singleEquivMap.get(r);
                 // Return immediately for performance if the first matching
                 // subtag is found.
                 return new String[]{replaceFirstSubStringMatch(range,

@@ -678,11 +678,11 @@
         for (LanguageRange lr : priorityList) {
             String range = lr.getRange();
             String r = range;
             boolean hasEquivalent = false;
 
-            while (r.length() > 0) {
+            while (!r.isEmpty()) {
                 if (keyMap.containsKey(r)) {
                     hasEquivalent = true;
                     List<String> equivalents = map.get(keyMap.get(r));
                     if (equivalents != null) {
                         int len = r.length();