stringbuffer.java

This is a resource based on j2me embedded,if you dont understand,you can connection with me .

     * @return  a reference to this <code>StringBuffer</code> object.
     * @see     java.lang.String#valueOf(float)
     * @see     java.lang.StringBuffer#append(java.lang.String)
     */
    public synchronized StringBuffer append(float f) {
        new FloatingDecimal(f).appendTo(this);
	return this;
    }

    /**
     * Appends the string representation of the <code>double</code> 
     * argument to this string buffer. 
     * <p>
     * The argument is converted to a string as if by the method 
     * <code>String.valueOf</code>, and the characters of that 
     * string are then appended to this string buffer. 
     *
     * @param   d   a <code>double</code>.
     * @return  a reference to this <code>StringBuffer</code> object.
     * @see     java.lang.String#valueOf(double)
     * @see     java.lang.StringBuffer#append(java.lang.String)
     */
    public synchronized StringBuffer append(double d) {
        new FloatingDecimal(d).appendTo(this);
	return this;
    }

    /**
     * Removes the characters in a substring of this <code>StringBuffer</code>.
     * The substring begins at the specified <code>start</code> and extends to
     * the character at index <code>end - 1</code> or to the end of the
     * <code>StringBuffer</code> if no such character exists. If
     * <code>start</code> is equal to <code>end</code>, no changes are made.
     *
     * @param      start  The beginning index, inclusive.
     * @param      end    The ending index, exclusive.
     * @return     This string buffer.
     * @exception  StringIndexOutOfBoundsException  if <code>start</code>
     *             is negative, greater than <code>length()</code>, or
     *		   greater than <code>end</code>.
     * @since      1.2
     */
    public synchronized StringBuffer delete(int start, int end) {
	if (start < 0)
	    throw new StringIndexOutOfBoundsException(start);
	if (end > count)
	    end = count;
	if (start > end)
	    throw new StringIndexOutOfBoundsException();

        int len = end - start;
        if (len > 0) {
            if (shared)
                copy();
	    if(count != end) { /* IAI - 17 */
                CVM.copyCharArray(value, start+len, value, start, count-end);
            }
            count -= len;
        }
        return this;
    }

    /**
     * Removes the character at the specified position in this
     * <code>StringBuffer</code> (shortening the <code>StringBuffer</code>
     * by one character).
     *
     * @param       index  Index of character to remove
     * @return      This string buffer.
     * @exception   StringIndexOutOfBoundsException  if the <code>index</code>
     *		    is negative or greater than or equal to
     *		    <code>length()</code>.
     * @since       1.2
     */
    public synchronized StringBuffer deleteCharAt(int index) {
        if ((index < 0) || (index >= count))
	    throw new StringIndexOutOfBoundsException();
	if (shared)
	    copy();

	if(count - index - 1 != 0) { /* IAI - 17 */
            CVM.copyCharArray(value, index+1, value, index, count-index-1);
        }
	count--;
        return this;
    }

    /**
     * Replaces the characters in a substring of this <code>StringBuffer</code>
     * with characters in the specified <code>String</code>. The substring
     * begins at the specified <code>start</code> and extends to the character
     * at index <code>end - 1</code> or to the end of the
     * <code>StringBuffer</code> if no such character exists. First the
     * characters in the substring are removed and then the specified
     * <code>String</code> is inserted at <code>start</code>. (The
     * <code>StringBuffer</code> will be lengthened to accommodate the
     * specified String if necessary.)
     * 
     * @param      start    The beginning index, inclusive.
     * @param      end      The ending index, exclusive.
     * @param      str   String that will replace previous contents.
     * @return     This string buffer.
     * @exception  StringIndexOutOfBoundsException  if <code>start</code>
     *             is negative, greater than <code>length()</code>, or
     *		   greater than <code>end</code>.
     * @since      1.2
     */ 
    public synchronized StringBuffer replace(int start, int end, String str) {
        if (start < 0)
	    throw new StringIndexOutOfBoundsException(start);
	if (end > count)
	    end = count;
	if (start > end)
	    throw new StringIndexOutOfBoundsException();

	int len = str.length();
	int newCount = count + len - (end - start);
	if (newCount > value.length)
	    expandCapacity(newCount);
	else if (shared)
	    copy();

	if(count != end) { /* IAI - 17 */
            CVM.copyCharArray(value, end, value, start + len, count - end);
        }
        str.getChars(0, len, value, start);
        count = newCount;
        return this;
    }

    /**
     * Returns a new <code>String</code> that contains a subsequence of
     * characters currently contained in this <code>StringBuffer</code>.The 
     * substring begins at the specified index and extends to the end of the
     * <code>StringBuffer</code>.
     * 
     * @param      start    The beginning index, inclusive.
     * @return     The new string.
     * @exception  StringIndexOutOfBoundsException  if <code>start</code> is
     *             less than zero, or greater than the length of this
     *             <code>StringBuffer</code>.
     * @since      1.2
     */
    public synchronized String substring(int start) {
        return substring(start, count);
    }

    /**
     * Returns a new character sequence that is a subsequence of this sequence.
     *
     * <p> An invocation of this method of the form
     *
     * <blockquote><pre>
     * sb.subSequence(begin,&nbsp;end)</pre></blockquote>
     *
     * behaves in exactly the same way as the invocation
     *
     * <blockquote><pre>
     * sb.substring(begin,&nbsp;end)</pre></blockquote>
     *
     * This method is provided so that the <tt>StringBuffer</tt> class can
     * implement the {@link CharSequence} interface. </p>
     *
     * @param      start   the start index, inclusive.
     * @param      end     the end index, exclusive.
     * @return     the specified subsequence.
     *
     * @throws  IndexOutOfBoundsException
     *          if <tt>start</tt> or <tt>end</tt> are negative,
     *          if <tt>end</tt> is greater than <tt>length()</tt>,
     *          or if <tt>start</tt> is greater than <tt>end</tt>
     *
     * @since 1.4
     * @spec JSR-51
     */
    public CharSequence subSequence(int start, int end) {
        return this.substring(start, end);
    }

    /**
     * Returns a new <code>String</code> that contains a subsequence of
     * characters currently contained in this <code>StringBuffer</code>. The 
     * substring begins at the specified <code>start</code> and 
     * extends to the character at index <code>end - 1</code>. An
     * exception is thrown if 
     *
     * @param      start    The beginning index, inclusive.
     * @param      end      The ending index, exclusive.
     * @return     The new string.
     * @exception  StringIndexOutOfBoundsException  if <code>start</code>
     *             or <code>end</code> are negative or greater than
     *		   <code>length()</code>, or <code>start</code> is
     *		   greater than <code>end</code>.
     * @since      1.2 
     */
    public synchronized String substring(int start, int end) {
	if (start < 0)
	    throw new StringIndexOutOfBoundsException(start);
	if (end > count)
	    throw new StringIndexOutOfBoundsException(end);
	if (start > end)
	    throw new StringIndexOutOfBoundsException(end - start);
        return new String(value, start, end - start);
    }

    /**
     * Inserts the string representation of a subarray of the <code>str</code>
     * array argument into this string buffer. The subarray begins at the
     * specified <code>offset</code> and extends <code>len</code> characters.
     * The characters of the subarray are inserted into this string buffer at
     * the position indicated by <code>index</code>. The length of this
     * <code>StringBuffer</code> increases by <code>len</code> characters.
     *
     * @param      index    position at which to insert subarray.
     * @param      str       A character array.
     * @param      offset   the index of the first character in subarray to
     *		   to be inserted.
     * @param      len      the number of characters in the subarray to
     *		   to be inserted.
     * @return     This string buffer.
     * @exception  StringIndexOutOfBoundsException  if <code>index</code>
     *             is negative or greater than <code>length()</code>, or
     *		   <code>offset</code> or <code>len</code> are negative, or
     *		   <code>(offset+len)</code> is greater than
     *		   <code>str.length</code>.
     * @since 1.2
     */
    public synchronized StringBuffer insert(int index, char str[], int offset,
                                                                   int len) {
        if ((index < 0) || (index > count))
	    throw new StringIndexOutOfBoundsException();
	if ((offset < 0) || (offset + len < 0) || (offset + len > str.length))
	    throw new StringIndexOutOfBoundsException(offset);
	if (len < 0)
	    throw new StringIndexOutOfBoundsException(len);
	int newCount = count + len;
	if (newCount > value.length)
	    expandCapacity(newCount);
	else if (shared)
	    copy();
	if(count != index) { /* IAI - 17 */
            CVM.copyCharArray(value, index, value, index + len, count - index);
        }

	if(len != 0) { /* IAI - 17 */	
            CVM.copyCharArray(str, offset, value, index, len);
	}
	count = newCount;
	return this;
    }

    /**
     * Inserts the string representation of the <code>Object</code> 
     * argument into this string buffer. 
     * <p>
     * The second argument is converted to a string as if by the method 
     * <code>String.valueOf</code>, and the characters of that 
     * string are then inserted into this string buffer at the indicated 
     * offset. 
     * <p>
     * The offset argument must be greater than or equal to 
     * <code>0</code>, and less than or equal to the length of this 
     * string buffer. 
     *
     * @param      offset   the offset.
     * @param      obj      an <code>Object</code>.
     * @return     a reference to this <code>StringBuffer</code> object.
     * @exception  StringIndexOutOfBoundsException  if the offset is invalid.
     * @see        java.lang.String#valueOf(java.lang.Object)
     * @see        java.lang.StringBuffer#insert(int, java.lang.String)
     * @see        java.lang.StringBuffer#length()
     */
    public synchronized StringBuffer insert(int offset, Object obj) {
	return insert(offset, String.valueOf(obj));
    }

    /**
     * Inserts the string into this string buffer. 
     * <p>
     * The characters of the <code>String</code> argument are inserted, in 
     * order, into this string buffer at the indicated offset, moving up any 
     * characters originally above that position and increasing the length 
     * of this string buffer by the length of the argument. If 
     * <code>str</code> is <code>null</code>, then the four characters 
     * <code>"null"</code> are inserted into this string buffer.
     * <p>
     * The character at index <i>k</i> in the new character sequence is 
     * equal to:
     * <ul>
     * <li>the character at index <i>k</i> in the old character sequence, if 
     * <i>k</i> is less than <code>offset</code> 
     * <li>the character at index <i>k</i><code>-offset</code> in the 
     * argument <code>str</code>, if <i>k</i> is not less than 
     * <code>offset</code> but is less than <code>offset+str.length()</code> 
     * <li>the character at index <i>k</i><code>-str.length()</code> in the 
     * old character sequence, if <i>k</i> is not less than 
     * <code>offset+str.length()</code>
     * </ul><p>
     * The offset argument must be greater than or equal to 
     * <code>0</code>, and less than or equal to the length of this 
     * string buffer. 
     *
     * @param      offset   the offset.
     * @param      str      a string.
     * @return     a reference to this <code>StringBuffer</code> object.
     * @exception  StringIndexOutOfBoundsException  if the offset is invalid.
     * @see        java.lang.StringBuffer#length()
     */
    public synchronized StringBuffer insert(int offset, String str) {
	if ((offset < 0) || (offset > count)) {
	    throw new StringIndexOutOfBoundsException();
	}

	if (str == null) {
	    str = String.valueOf(str);
	}
	int len = str.length();
	int newcount = count + len;
	if (newcount > value.length)
	    expandCapacity(newcount);
	else if (shared)
	    copy();
	if(count != offset) { /* IAI - 17 */
            CVM.copyCharArray(value, offset, value, offset + len, count - offset);
        }
	str.getChars(0, len, value, offset);
	count = newcount;
	return this;
    }

    /**
     * Inserts the string representation of the <code>char</code> array 
     * argument into this string buffer. 
     * <p>
     * The characters of the array argument are inserted into the 
     * contents of this string buffer at the position indicated by 
     * <code>offset</code>. The length of this string buffer increases by 
     * the length of the argument. 
     * <p>
     * The overall effect is exactly as if the argument were converted to 
     * a string by the method {@link String#valueOf(char[])} and the 
     * characters of that string were then 
     * {@link #insert(int,String) inserted} into this 
     * <code>StringBuffer</code>  object at the position indicated by
     * <code>offset</code>.
     *
     * @param      offset   the offset.
     * @param      str      a character array.
     * @return     a reference to this <code>StringBuffer</code> object.
     * @exception  StringIndexOutOfBoundsException  if the offset is invalid.