fiiling text in rect, not equal size

package com.company;

public class DoubleReshuffleMethod extends CezarCryptoMethods{
    DoubleReshuffleMethod(String text, String xaxis, String yaxis) {
        char [][] array = new char[yaxis.length()][xaxis.length()];

        int index = 0;
        for(int j = 0; j < yaxis.length(); ++j){
            for(int k = 0; k < xaxis.length(); ++k) {
                char ch = ' ';
                if (index < text.length()) {
                    ch = text.charAt(index++);
                }
                array[j][k] = ch;
            }
        }
        for (int i=0; i<yaxis.length(); i++) {
            for (int j=0; j<xaxis.length(); j++)
                System.out.print(array[i][j]);
            System.out.println();
        }
    }
}