URLEncoder for J2ME

J2ME tech: how to encode url in J2ME programing?
Example code:
URLEncoder.encode(str,"UTF-8"));

URLEncoder class for J2ME:

package com.mobile.util;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;

/**
 * Adapted from J2SE java.net.URLEncoder.
 */
public class URLEncoder {
  
  public static String encode(String s, String enc) 
    throws UnsupportedEncodingException {

    boolean needToChange = false;
    boolean wroteUnencodedChar = false; 
    int maxBytesPerChar = 10; // rather arbitrary limit, but safe for now
      StringBuffer out = new StringBuffer(s.length());
    ByteArrayOutputStream buf = new ByteArrayOutputStream(maxBytesPerChar);

    OutputStreamWriter writer = new OutputStreamWriter(buf, enc);

    for (int i = 0; i < s.length(); i++) {
        int c = (int) s.charAt(i);
        //System.out.println("Examining character: " + c);
        if (dontNeedEncoding(c)) {
        if (c == ' ') {
            c = '+';
            needToChange = true;
        }
        //System.out.println("Storing: " + c);
        out.append((char)c);
        wroteUnencodedChar = true;
        } else {
        // convert to external encoding before hex conversion
        try {
            if (wroteUnencodedChar) { // Fix for 4407610
                writer = new OutputStreamWriter(buf, enc);
            wroteUnencodedChar = false;
            }
            writer.write(c);
            /*
             * If this character represents the start of a Unicode
             * surrogate pair, then pass in two characters. It's not
             * clear what should be done if a bytes reserved in the 
             * surrogate pairs range occurs outside of a legal
             * surrogate pair. For now, just treat it as if it were 
             * any other character.
             */
            if (c >= 0xD800 && c <= 0xDBFF) {
            /*
              System.out.println(Integer.toHexString(c) 
              + " is high surrogate");
            */
            if ( (i+1) < s.length()) {
                int d = (int) s.charAt(i+1);
                /*
                  System.out.println("\tExamining " 
                  + Integer.toHexString(d));
                */
                if (d >= 0xDC00 && d <= 0xDFFF) {
                /*
                  System.out.println("\t" 
                  + Integer.toHexString(d) 
                  + " is low surrogate");
                */
                writer.write(d);
                i++;
                }
            }
            }
            writer.flush();
        } catch(IOException e) {
            buf.reset();
            continue;
        }
        byte[] ba = buf.toByteArray();
        for (int j = 0; j < ba.length; j++) {
            out.append('%');
            char ch = CCharacter.forDigit((ba[j] >> 4) & 0xF, 16);
            // converting to use uppercase letter as part of
            // the hex value if ch is a letter.
//            if (Character.isLetter(ch)) {
//            ch -= caseDiff;
//            }
            out.append(ch);
            ch = CCharacter.forDigit(ba[j] & 0xF, 16);
//            if (Character.isLetter(ch)) {
//            ch -= caseDiff;
//            }
            out.append(ch);
        }
        buf.reset();
        needToChange = true;
        }
    }

    return (needToChange? out.toString() : s);
  }
  
 static class CCharacter {
    public static char forDigit(int digit, int radix) {
      if ((digit >= radix) || (digit < 0)) {
          return '\0';
      }
      if ((radix < Character.MIN_RADIX) || (radix > Character.MAX_RADIX)) {
          return '\0';
      }
      if (digit < 10) {
          return (char)('0' + digit);
      }
      return (char)('a' - 10 + digit);
  }
  }
  public static boolean dontNeedEncoding(int ch){
    int len = _dontNeedEncoding.length();
    boolean en = false;
    for(int i =0;i< len;i++){
      if(_dontNeedEncoding.charAt(i) == ch)
      {
        en = true;
        break;
      }
    }
    
    return en;
  }
  //private static final int caseDiff = ('a' - 'A');
  private static String _dontNeedEncoding = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ -_.*";


  /**
   * @param args  test string
   */
  public static void main(String[] args) {
    String s = args[0];
    try {
      System.out.println(encode(s,"UTF-8"));
    } catch (UnsupportedEncodingException e) {
    }
  }
}