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

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

@@ -86,10 +86,25 @@
      *          {@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}