DouKaku?

import java.io.IOException;
import java.io.StringReader;

public class Divid {

    public static void main(String[] args) throws IOException{
        int[] n = new int[Integer.parseInt(args[0])];
        String target = args[1];
        for (int i = 0; i < n.length; i++) {
            n[i] = 0;
        }
        int turn = 0;
        StringReader reader = new StringReader(target);
        while(reader.read() != -1){
            n[turn++]++;
            if (turn == n.length)
                turn = 0;
        }
        String v[] = new String[n.length];
        int pos = 0;
        for (int i = 0; i < n.length; i++) {
            v[i] = target.substring(pos, (pos = (pos + n[i])));
            System.out.println(v[i]);
        }
    }
}

import java.util.*;
public class Divide {
    public static void main(String[] args) {
        String sample = "ゆめよりもはかなき世のなかをなげきわびつゝあかしくらすほどに四月十よひにもなりぬれば木のしたくらがりもてゆく";
        System.out.println(Arrays.toString(devide(sample, 4)));
        System.out.println(Arrays.toString(devide(sample, 5)));
        System.out.println(Arrays.toString(devide(sample, 6)));
    }
    public static String[] devide(String s, int r) {
        int[] x = new int[r];
        for (int i = 0, j = 0; i < s.length(); i++, j++) {
            if (j >= x.length) j = 0;
            x[j]++;
        }
        List<String> list = new ArrayList<String>(r);
        for (int i = 0; i < x.length; i++) {
            list.add(s.substring(0, x[i]));
            s = s.substring(x[i]);
        }
        return list.toArray(new String[0]);
    }
}