Answer to Monday's Programming Question

Monday's question was to modify the code point program to use a JOptionPane. It needed to show the Unicode characters for the code point range of U+3041 to U+309F. The characters are for Hiragana, used in writing Japanese:

ぁあぃいぅうぇえぉおかがきぎくぐけげこごさざしじすずせぜそぞ
ただちぢっつづてでとどなにぬねのはばぱひびぴふぶぷへべぺほぼ
ぽまみむめもゃやゅゆょよらりるれろゎわゐゑをんゔゕゖ゗゘゙゚
゛゜ゝゞゟ

Here's my version of the program:

import java.util.Scanner;
import javax.swing.JOptionPane;

public class DialogCodePoints {

  public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    System.out.println("Enter in first Unicode code point (e.g., U+0021): ");
    String startCodePoint = input.nextLine();
    System.out.println("Enter in last Unicode code point (e.g., U+007F}: ");
    String lastCodePoint = input.nextLine();

    StringBuffer sb = new StringBuffer();
    //The substring is the hexadecimal number (e.g., U+0021 without the "U+").
    //It can then be converted to an int by using a radix of 16
    int hexStartCodePoint = Integer.parseInt(startCodePoint.substring(2),16);
    int hexLastCodePoint = Integer.parseInt(lastCodePoint.substring(2),16);

    int wrapCount = 0;
    for (int hexCodePoint = hexStartCodePoint; hexCodePoint < hexLastCodePoint+1;hexCodePoint++)
    {
      //The toChars method will convert a Unicode Code Point to
      /its UTF-16 representation.
      sb.append(Character.toChars(hexCodePoint));

      //Add a newline every 50 characters to control the size
      //of the dialog box.
      wrapCount++;
      if (wrapCount == 50)
      {
        sb.append("\n");
        wrapCount = 0;
      }
    }

    //Create a JOptionPane to display the Unicode Characters
    JOptionPane.showMessageDialog(null, sb, "Characters", JOptionPane.INFORMATION_MESSAGE );
  }
}