Examples of java.lang.StringBuffer

java.lang.StringBuffer
A thread-safe, mutable sequence of characters. A string buffer is like a {@link String}, but can be modified. At any point in time it contains some particular sequence of characters, but the length and content of the sequence can be changed through certain method calls.
String buffers are safe for use by multiple threads. The methods are synchronized where necessary so that all the operations on any particular instance behave as if they occur in some serial order that is consistent with the order of the method calls made by each of the individual threads involved.
The principal operations on a StringBuffer are the append and insert methods, which are overloaded so as to accept data of any type. Each effectively converts a given datum to a string and then appends or inserts the characters of that string to the string buffer. The append method always adds these characters at the end of the buffer; the insert method adds the characters at a specified point.
For example, if z refers to a string buffer object whose current contents are "start", then the method call z.append("le") would cause the string buffer to contain "startle", whereas z.insert(4, "le") would alter the string buffer to contain "starlet".
In general, if sb refers to an instance of a StringBuffer, then sb.append(x) has the same effect as sb.insert(sb.length(), x).
Whenever an operation occurs involving a source sequence (such as appending or inserting from a source sequence) this class synchronizes only on the string buffer performing the operation, not on the source.
Every string buffer has a capacity. As long as the length of the character sequence contained in the string buffer does not exceed the capacity, it is not necessary to allocate a new internal buffer array. If the internal buffer overflows, it is automatically made larger. As of release JDK 5, this class has been supplemented with an equivalent class designed for use by a single thread, {@link StringBuilder}. The StringBuilder class should generally be used in preference to this one, as it supports all of the same operations but it is faster, as it performs no synchronization. @author Arthur van Hoff @version 1.101, 11/17/05 @see java.lang.StringBuilder @see java.lang.String @since JDK1.0

   replaceCharData(String fileName)
   throws IOException, Exception
   {
      text = br.readLine();
      
      sb = new StringBuffer();
      int iRow = 0;
      String strBefore, 
      strAfter;
      int ind;
      
    //pattern = Pattern.compile(searchPossibleMissedChars);
      ConvertedRow convertedRow = null;
      boolean bErrorFounded = false;
      StringBuffer sbErrorRow = new StringBuffer();      
      StringBuffer sbErrorRowPosition = new StringBuffer();
      int iRowLen, iRowLenPos;
      
      while(text != null)
      {
        iRow++;
        iRowLen = sbErrorRow.length();
        bErrorFounded = false;
        if (iRowLen > 0)
          iRowLen = iRowLen -1;
        sbErrorRow.delete(0, iRowLen);
        // sbErrorRow = new StringBuffer();
        iRowLenPos = sbErrorRowPosition.length();
        if (iRowLenPos > 0)
          iRowLenPos = iRowLenPos -1;
        sbErrorRowPosition.delete(0, iRowLenPos);
        // sbErrorRowPosition = new StringBuffer();
        if (text.equals("")) // jos alkup. rivi sisältää pelkän CR:n
          text = "\n"; // lisää se
        else
        {
          String tmp = text;
              if (tmp.length() == 0)
                text = "\n"; // poista välilyonnit
              else
              { // testaa onko trimmattu tmp vain white
                char [] chars = tmp.toCharArray();
                int max = chars.length;
                boolean isWhiteSpace = true;
                for(int i = 0; i < max; i++)
                {
                  if (!Character.isWhitespace(chars[i]))
                  {
                    isWhiteSpace = false;
                    break;
                  }                    
                }
                  
                if (isWhiteSpace)  
                  text = "\n"; // poista välilyonnit
                else
                {
        
              //text = DecoderCharacterSet.changeSpecialChars(text);
              if (m_bMakeCharConverstion)
              {          
                convertedRow = makeCharConvert(text);
                if (convertedRow != null)
                {
                  
                  //String unModInputRow = convertedRow.getInputRow();
                  String strOutputRow = convertedRow.getOutputRow();
                  if (strOutputRow != null)
                  {
                    String strErrorRow = null;
                    byte [] arrByteUnModInputRow = convertedRow.getArrChangedCharFlags();
                    int maxU = strOutputRow.length();
                    char ch; 
                    byte modified;
                    int maxE ;
                    CharArea ca;
                    int iCh;
                    boolean bCharError = false;
                    
                    for(int i = 0 ; i < maxU; i++)
                    {
                      ch = strOutputRow.charAt(i);
                      maxE = arrExcludeAreas.length;
                      iCh = ch;
                      bCharError = false;
                      
                      for(int k = 0 ; k < maxE; k++)
                      {
                        ca = arrExcludeAreas[k];
                        if (ca == null)
                          continue;
                        
                        if (iCh >= ca.getChStartChar() && iCh <= ca.getChEndChar())
                        {
                          int indErrorPos = i; 
                           bErrorFounded = true;
                           bCharError = true;
                           sbErrorRow.append("[");
                           sbErrorRow.append(ch);
                           sbErrorRow.append("]");
                           String strCh = "" +ch;
                           sbErrorRowPosition.append(
                                                      "\nrow:          " + iRow +"\n");
                           sbErrorRowPosition.append("column:       " + (i+1) +"\n");
                           sbErrorRowPosition.append("position:     " + (i+1) +"\n");
                           sbErrorRowPosition.append("position end: " + (i+1) +"\n");
                           sbErrorRowPosition.append("'" + ch +"' => utf-8 char: " +iCh +" "
                                    +"utf-8 in hex: " 
                                    +byteArrayToHexString(strCh.getBytes()) +"\n");
                           // strErrorRow = sbErrorRow.toString();
                           // int iChError = ch;
                           // giveErrorMessage(fileName,                                    
                            /// strErrorRow, iRow, indErrorPos);
                           break;
                        }                        
                      }    
                      
                      if (!bCharError)
                        sbErrorRow.append(ch);
                    }
                  }
                                    
                   }            
                }
              }
        }
        if (bErrorFounded)
        {                           
         giveErrorMessage(fileName, 
            sbErrorRow.toString() +"\n" 
            + sbErrorRowPosition.toString() +"\n", iRow, -1);


        }


        sb.append(text +"\n");        
        text = br.readLine();

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       return value;
     int ind = text.indexOf(chSeach);
     if (ind == -1)
       return value;
     
     StringBuffer ret = new StringBuffer (value.length());
     int max = value.length();
     char ch;
     
     for(int i = 0; i < max; i++)
     {
       ch = value.charAt(i);
       if (ch == chSeach)
         ret.append(strReplace);
       else
         ret.append(ch);
     }
     return ret.toString();
   }

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   * This method returns a string of random 36-based numbers thats exacly <code>length</code> long.
   * @param length Required length of the string
   * @return A string of random 36-base based numbers with a length of <code>length</code>.
   */
  public static String getRandomValue(int length) {
    StringBuffer result = new StringBuffer();
    for (int i = 0; i < length; i++) {
      int v = Math.abs(RandomGUID.myRand.nextInt()) % 36;
      result.append(Long.toString(v, 36));
    }
    return result.toString();
  }

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   * for randomness. It is about 3.5-times slower, so use it only when you need really strong
   * randomness!
   * @see #getRandomValue
   */
  public static String getStrongRandomValue(int length) {
    StringBuffer result = new StringBuffer();
    for (int i = 0; i < length; i++) {
      int v = Math.abs(RandomGUID.mySecureRand.nextInt()) % 36;
      result.append(Long.toString(v, 36));
    }
    return result.toString();
  }

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    String id;                                                // generated id


    while (D.length() < 4) {                                  // The stamp will not be longer than 12 characters
      D = '0' + D;
    }                                                         // start with the current time stamp
    StringBuffer sb = new StringBuffer();


      int i = Math.abs(RandomGUID.myRand.nextInt());
    sb.append(Integer.toString(i, 16));
    sb.append(getRandomValue(sb.length()-8));
      sb.append('-').append(D.substring(D.length() - 4));


    id = sb.toString();


    return id;
  }

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    String id;                                                // generated id


    while (D.length() < 4) {                                  // The stamp will not be longer than 12 characters
      D = '0' + D;
    }                                                         // start with the current time stamp
    StringBuffer sb = new StringBuffer();


      int i = Math.abs(RandomGUID.mySecureRand.nextInt());
    sb.append(Integer.toString(i, 16));
    sb.append(getRandomValue(sb.length()-8));
      sb.append('-').append(D.substring(D.length() - 4));


    id = sb.toString();


    return id;
  }

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    lastUserUniqueIDTime = d;
    String D = Long.toString(d, 36);
    while (D.length() < 8) {
      D = '0' + D;
    }
    StringBuffer sb = new StringBuffer(RandomGUID.myShortCode);
    sb.append(D);
    sb.append(getRandomValue(2));
    sb.append(twoLetterChecksum(sb.toString()));
    return sb.toString().toLowerCase();


  }

View Full Code Here

      D = '0' + D;
    }                                                         // start with the current time stamp


    D = D.substring(D.length() - 6);


    StringBuffer sb = new StringBuffer(RandomGUID.machineID);


    if (RandomGUID.myRand != null) {                                        // and a few random bytes
      long l = Math.abs(RandomGUID.myRand.nextLong());


      sb.append(Long.toString(l, 32));


      sb.append('-');
    }


    id = sb.append(D).toString();


    return id;
  }

View Full Code Here

      D = '0' + D;
    }                                                         // start with the current time stamp


    D = D.substring(D.length() - 6);


    StringBuffer sb = new StringBuffer(RandomGUID.machineID);


    if (RandomGUID.mySecureRand != null) {                                        // and a few random bytes
      long l = Math.abs(RandomGUID.mySecureRand.nextLong());


      sb.append(Long.toString(l, 32));


      sb.append('-');
    }


    id = sb.append(D).toString();


    return id;
  }

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     * to <code>DISCONNECTED_STATE</code>.
     ***/
    public POP3()
    {
        setDefaultPort(DEFAULT_PORT);
        __commandBuffer = new StringBuffer();
        __popState = DISCONNECTED_STATE;
        _reader = null;
        __writer = null;
        _replyLines = new Vector();
        _commandSupport_ = new ProtocolCommandSupport(this);

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