How to keep value in arrayList and print into matrix form.

Question

compute all primes less than N, and display the results
step by step .summarize the computed results in an easy-to-read format.(matrix)
The program starts by asking for an integer value N from the user. Print out the initial matrix
of numbers from 2 to N.
To find all primes less than N, begin by making a table of integers from 2 to N.
Find the smallest integer i, that is NOT prime and NOT crossed out. Mark i as a prime
number and cross out 2i, 3i, 4i, ?, ni N.
At this point, program should print the intermediate results in a matrix format, and pause
until any key is pressed before proceeding.clear screen every
time prior to printing the intermediate results (in the matrix format).
When i > N , the algorithm terminates. screen is cleared once again,
before the program prints the final results in the matrix format.
Following are the requirements for the matrix format:
- The matrix consists of 10 columns
- The number of rows varies, depending on the input N
- Initial matrix: The program prints an empty string in place of 1
- Intermediate matrix: The program prints values for all prime numbers and numbers
that are not crossed out. The program prints an empty string for each crossed-out
number.
Final matrix: The program prints only the prime numbers less than N
P.S I want to write at least 3 classes

Answer 1

This is my new first class but it have an error
import java.io.*;
import java.util.*;
public class ArrayListExample2 {
    public static void main(String[] args)throws IOException {
        ArrayListExample listExample = new ArrayListExample();
        listExample.doArrayListExample();
    public void doArrayListExample()throws IOException {
          BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
         System.out.print("enter limit : ");
          int max=Integer.parseInt(br.readLine());
          System.out.println();
        int counter = 2;
        List listA = new ArrayList();// int list
        //List listB = new ArrayList(); //string list
        for (int i = 2; i <= max; i++) {
            System.out.print("\t" + i );
            listA.add(new Integer(i)); //???????2-max ??listA
          int count =0;
          BufferedReader en = new BufferedReader(new InputStreamReader(System.in));
          while(count<Math.sqrt(max))
                 // max may be number of input or size of array list
          //BufferedReader en = new BufferedReader(new InputStreamReader(System.in));
          System.out.println ("Please enter");
          en.readLine();// wait for enter
          listA.removeNotPrime();
          count++;
     public void removeNotPrime()// what parametor?Need?
          for (int i=0;i<Math.sqrt(max)))
               int prime = listA.get(i);
                    for (int j=i+1;i<=listA.size();j++)
                     int val = listA.get(j);
                    if (val%prime==0)
                    listA.remove(j);
This part for test
        for (int i = 0; i <= max; i++)  // printttttttttt
            //System.out.print("\t" + i );
               System.out.print("\t" + listA.get(i);
            // call class printMatrix;
}