java.util.Objects includes a number of convenience methods to make it easier to work with references that may be null, typically by conditionally substituting a default value for a null object reference.

Methods should be added:

     /**
     * Returns the first argument if it is not {@code null} and
     * otherwise returns the non-null second argument.
     *
     * @param obj an object
     * @param defaultObj a non-null object to return if the first argument
     *                   is {@code null}
     * @param <T> the type of the reference
     * @return the first argument if it is not {@code null} and
     *        otherwise the second argument if it is not null
     * @throws NullPointerException if both {@code obj} is null and
     *        {@code nullDefault} is {@code null}
     * @since 9
     */
    public static <T> T nonNullElse(T obj, T defaultObj) {
        return (obj != null) ? obj : requireNonNull(defaultObj, "defaultObj");
    }

    /**
     * Returns the first argument if it is not {@code null} and otherwise
     * returns the non-null value of {@code supplier.get()}.
     *
     * @param obj an object
     * @param supplier of a non-null object to return if the first argument
     *                 is {@code null}
     * @param <T> the type of the reference
     * @return the first argument if it is not {@code null} and otherwise
     *         the value from {@code supplier.get()} if it is not {@code null}
     * @throws NullPointerException if both {@code obj} is null and
     *        either the {@code supplier} is {@code null} or
     *        the {@code supplier.get()} value is {@code null}
     * @since 9
     */
    public static <T> T nonNullElseGet(T obj, Supplier<? extends T> supplier) {
        return (obj != null) ? obj : requireNonNull(requireNonNull(supplier, "supplier").get(), "supplier.get()");
    }