src/java.base/share/classes/java/util/UUID.java

@@ -390,21 +390,11 @@
      * }</pre></blockquote>
      *
      * @return  A string representation of this {@code UUID}
      */
     public String toString() {
-        char[] chars = new char[36];
-        jla.formatUnsignedLong(mostSigBits >> 32, 4, chars, 0, 8);
-        chars[8] = '-';
-        jla.formatUnsignedLong(mostSigBits >> 16, 4, chars, 9, 4);
-        chars[13] = '-';
-        jla.formatUnsignedLong(mostSigBits, 4, chars, 14, 4);
-        chars[18] = '-';
-        jla.formatUnsignedLong(leastSigBits >> 48, 4, chars, 19, 4);
-        chars[23] = '-';
-        jla.formatUnsignedLong(leastSigBits, 4, chars, 24, 12);
-        return jla.newStringUnsafe(chars);
+        return jla.fastUUID(leastSigBits, mostSigBits);
     }
 
     /**
      * Returns a hash code for this {@code UUID}.
      *