Poj Solution 3768

http://poj.org/problem?id=3768

import java.util.Scanner;   
  
public class Main {   
  
    public static void main(String[] args) {   
        Scanner sc = new Scanner(System.in);   
        while (sc.hasNextInt()) {   
            int n = sc.nextInt();   
            if (n == 0)   
                break;   
            sc.nextLine();   
            String[] template = new String[n];   
            for (int i = 0; i < n; ++i) {   
                String s = sc.nextLine();   
                template[i] = new String(s);   
            }   
            // sc.nextLine();   
            // sc.nextLine();   
            int level = sc.nextInt();   
            copy(template, template, level);   
        }   
    }   
  
    private static void copy(String[] template1, String[] template2, int level) {   
        --level;   
        if (level > 0) {   
            int n1 = template1.length;   
            int n2 = template2.length;   
            String[] tmpTemplate = new String[n1 * n2];   
            int k = 0;   
            String spaceS = spaceStr(n2);   
            for (int i = 0; i < n1; ++i) {   
                for (int j = 0; j < n1; ++j) {   
                    k = i * n2;   
                    if (template1[i].charAt(j) == ' ') {   
                        for (int x = 0; x < n2; ++x) {   
                            if (tmpTemplate[k] != null)   
                                tmpTemplate[k] += (spaceS);   
                            else  
                                tmpTemplate[k] = new String(spaceS);   
                            k++;   
                        }   
                    } else {   
                        for (int x = 0; x < n2; ++x) {   
                            if (tmpTemplate[k] != null)   
                                tmpTemplate[k] += template2[x];   
                            else  
                                tmpTemplate[k] = template2[x];   
                            k++;   
                        }   
                    }   
                }   
                // print(tmpTemplate);   
            }   
            copy(template1, tmpTemplate, level);   
        } else  
            print(template2);   
  
    }   
  
    private static String spaceStr(int n) {   
        StringBuilder sb = new StringBuilder();   
        for (int i = 0; i < n; ++i) {   
            sb.append(" ");   
        }   
        return sb.toString();   
    }   
  
    private static void print(String[] template) {   
        int n = template.length;   
        // System.out.println(n);   
        for (int i = 0; i < n; ++i) {   
            System.out.print(template[i]);   
            System.out.println();   
        }   
    }   
}