Please provide me with the coding for a program that prompts the user to enter the number of student's, the student's name, and the student's test score.

import java.io.*;
import java.util.*;

class ShowData implements Comparable {
        String name;
        int marks;

        public void setName(String name) {
                this.name = name;
        }

        public String getName() {
                return name;
        }

        public void setMarks(int marks) {
                this.marks = marks;
        }

        public int getMarks() {
                return marks;
        }
        public int compareTo(Object Student) throws ClassCastException {
                if (!(Student instanceof ShowData))
                        throw new ClassCastException("Error");
                int mm = ((ShowData) Student).getMarks();
                return this.marks - mm;
        }
}

public class StudentData {
              public static void main(String[] args) {
              Scanner input=new Scanner(System.in);
              System.out.print("Enter number of students: ");
              int num=input.nextInt();
              int j = 0;
                ShowData data[] = new ShowData[num];
                for(int i=0;i<data.length;i++){
                System.out.print("Enter Name: ");
                String name=input.next();
                System.out.print("Enter Marks: ");
                int marks=input.nextInt();

                                data[i] = new ShowData();
                                data[i].setName(name);
                                data[i].setMarks(marks);
                }
                        Arrays.sort(data,Collections.reverseOrder());
                        for (int i = 0; i < num; i++) {
                                        ShowData show = data[i];
                                        String name = show.getName();
                                        int marks = show.getMarks();
                                        System.out.println(name+"\t "+marks);
                        }
              }
}