src/java.base/share/classes/java/time/format/DateTimeFormatterBuilder.java

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

@@ -1437,11 +1437,11 @@
      * @param literal  the literal to append, not null
      * @return this, for chaining, not null
      */
     public DateTimeFormatterBuilder appendLiteral(String literal) {
         Objects.requireNonNull(literal, "literal");
-        if (literal.length() > 0) {
+        if (!literal.isEmpty()) {
             if (literal.length() == 1) {
                 appendInternal(new CharLiteralPrinterParser(literal.charAt(0)));
             } else {
                 appendInternal(new StringLiteralPrinterParser(literal));
             }

@@ -1830,11 +1830,11 @@
                 }
                 if (pos >= pattern.length()) {
                     throw new IllegalArgumentException("Pattern ends with an incomplete string literal: " + pattern);
                 }
                 String str = pattern.substring(start + 1, pos);
-                if (str.length() == 0) {
+                if (str.isEmpty()) {
                     appendLiteral('\'');
                 } else {
                     appendLiteral(str.replace("''", "'"));
                 }
 

@@ -4330,11 +4330,11 @@
 
         private PrefixTree(String k, String v, PrefixTree child) {
             this.key = k;
             this.value = v;
             this.child = child;
-            if (k.length() == 0){
+            if (k.isEmpty()) {
                 c0 = 0xffff;
             } else {
                 c0 = key.charAt(0);
             }
         }