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

@@ -235,6 +235,21 @@
                         new CodePointIterator(),
                         Spliterator.ORDERED),
                 Spliterator.ORDERED,
                 false);
     }
+
+    /**
+     * Returns a {@code CharSequence} of specified length representing repetitions
+     * of the same character.
+     *
+     * @param c the character to be repeated
+     * @param length the length of resulting {@code CharSequence}
+     * @return a {@code CharSequence} of {@code length} repetitions of
+     * character {@code c}.
+     * @throws IllegalArgumentException if given {@code length} is negative
+     * @since 10
+     */
+    static CharSequence repetitions(char c, int length) {
+        return new CharRepetitions(c, length);
+    }
 }