public ByteArrayOutputStream() 
{
        this(32);
}

Creates a new byte array output stream. The buffer capacity is initially 32 bytes, though its size increases if necessary.

 public ByteArrayOutputStream(int size) 
{
        if (size <  0) {
            throw new IllegalArgumentException("Negative initial size: "
                                               + size);
        }
        buf = new byte[size];
}

Creates a new byte array output stream, with a buffer capacity of the specified size, in bytes.

Parameters:

size - the initial size.

Throws:

IllegalArgumentException - if size is negative.

exception: IllegalArgumentException - if size is negative.

 public  void close() throws IOException 
{

}

Closing a ByteArrayOutputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.

 public synchronized  void reset() 
{
        count = 0;
}

Resets the count field of this byte array output stream to zero, so that all currently accumulated output in the output stream is discarded. The output stream can be used again, reusing the already allocated buffer space.

 public synchronized int size() 
{
        return count;
}

Returns the current size of the buffer.

 public synchronized byte[] toByteArray() 
{
        return Arrays.copyOf(buf, count);
}

Creates a newly allocated byte array. Its size is the current size of this output stream and the valid contents of the buffer have been copied into it.

 public synchronized String toString() 
{
        return new String(buf, 0, count);
}

Converts the buffer's contents into a string decoding bytes using the platform's default character set. The length of the new String is a function of the character set, and hence may not be equal to the size of the buffer.

This method always replaces malformed-input and unmappable-character sequences with the default replacement string for the platform's default character set. The {@linkplain java.nio.charset.CharsetDecoder} class should be used when more control over the decoding process is required.

 public synchronized String toString(String charsetName) throws UnsupportedEncodingException 
{
        return new String(buf, 0, count, charsetName);
}

Converts the buffer's contents into a string by decoding the bytes using the specified charsetName . The length of the new String is a function of the charset, and hence may not be equal to the length of the byte array.

This method always replaces malformed-input and unmappable-character sequences with this charset's default replacement string. The java.nio.charset.CharsetDecoder class should be used when more control over the decoding process is required.

 public synchronized String toString(int hibyte) 
{
        return new String(buf, hibyte, 0, count);
}

Creates a newly allocated string. Its size is the current size of the output stream and the valid contents of the buffer have been copied into it. Each character c in the resulting string is constructed from the corresponding element b in the byte array such that:

    c == (char)(((hibyte & 0xff) << 8) | (b & 0xff))

 public synchronized  void write(int b) 
{
        ensureCapacity(count + 1);
        buf[count] = (byte) b;
        count += 1;
}

Writes the specified byte to this byte array output stream.

 public synchronized  void write(byte[] b,
    int off,
    int len) 
{
        if ((off <  0) || (off  > b.length) || (len <  0) ||
            ((off + len) - b.length  > 0)) {
            throw new IndexOutOfBoundsException();
        }
        ensureCapacity(count + len);
        System.arraycopy(b, off, buf, count, len);
        count += len;
}

Writes len bytes from the specified byte array starting at offset off to this byte array output stream.

 public synchronized  void writeTo(OutputStream out) throws IOException 
{
        out.write(buf, 0, count);
}

Writes the complete contents of this byte array output stream to the specified output stream argument, as if by calling the output stream's write method using out.write(buf, 0, count).