src/java.base/share/classes/java/lang/CharSequence.java

rev 59316 : 8215401: Add isEmpty default method to CharSequence
Reviewed-by: jlaskey, rriggs, jjg

*** 86,95 ****
--- 86,110 ----
       *          {@code length()}
       */
      char charAt(int index);
  
      /**
+      * Returns {@code true} if this character sequence is empty.
+      *
+      * @implNote
+      * The default implementation returns the result of calling {@code length() == 0}.
+      *
+      * @return {@code true} if {@link #length()} is {@code 0}, otherwise
+      * {@code false}
+      *
+      * @since 15
+      */
+     default boolean isEmpty() {
+         return this.length() == 0;
+     }
+ 
+     /**
       * Returns a {@code CharSequence} that is a subsequence of this sequence.
       * The subsequence starts with the {@code char} value at the specified index and
       * ends with the {@code char} value at index {@code end - 1}.  The length
       * (in {@code char}s) of the
       * returned sequence is {@code end - start}, so if {@code start == end}