explanation

public int compareTo(Object Student) throws ClassCastException {
                if (!(Student instanceof StudentMarks))
                       throw new ClassCastException("Not a Student!");
                int mark = ((StudentMarks) Student).getMarks();
                return this.marks - mark;

Hi,can I know what is the meaning for the above coding?I have find the explanation in internet,but not very clear about it. Thank you.

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