A String method for repeating sequences of characters has been long requested with no follow through. There are also have been requests for repeat counts on Appendable#append but that would require significant coordination of Appendable implementations, including StringBuilder. Having basic repeat functionality the String will suffice for now.

    /**
     * Returns a string whose value is the concatenation of this
     * string repeated {@code count} times.
     * <p>
     * If this string is empty or count is zero then the empty
     * string is returned.
     *
     * @param count number of times to repeat
     *
     * @return A string composed of this string repeated
     * {@code count} times or the empty string if this
     * string is empty or count is zero
     *
     * @throws IllegalArgumentException if the {@code count} is
     * negative.
     *
     * @since 11
     */
    public String repeat(int count) {

Webrev: http://cr.openjdk.java.net/~jlaskey/8197594/webrev-02/index.html
JavaDoc: http://cr.openjdk.java.net/~jlaskey/8197594/String.html