public class Video {
    private String title;
    private int length;

    public Video(String title, int length) {
        setTitle(title);
        setLength(length);
    }

    public void setTitle(String title) {
        if (title == null)
            throw new IllegalArgumentException("null title");
        this.title = title;
    }

    public String getTitle() {
        return title;
    }

    public void setLength(int length) {
        if (length < 0)
            throw new IllegalArgumentException("negative length");
        this.length = length;
    }

    public int getLength() {
        return length;
    }

    public String toString() {
        return "Video: title: " + title + " length: " + length;
    }

    public boolean equals(Object rhs) {
        if (rhs instanceof Video) {
            Video v = (Video) rhs;
            return title.equals(v.title) && length == v.length;
        }
        return false;
    }
}