File	Doc	Category	Size	Date	Package
ByteArrayOutputStream.java	API Doc	Java SE 5 API	7018	Fri Aug 26 14:56:58 BST 2005	java.io

ByteArrayOutputStream

• java.lang.Object
  • java.io.OutputStream

Fields Summary
protected byte[]	buf The buffer where data is stored.
protected int	count The number of valid bytes in the buffer.

Constructors Summary
public ByteArrayOutputStream() Creates a new byte array output stream. The buffer capacity is initially 32 bytes, though its size increases if necessary. this(32);
public ByteArrayOutputStream(int size) Creates a new byte array output stream, with a buffer capacity of the specified size, in bytes. param size the initial size. exception IllegalArgumentException if size is negative. if (size < 0) { throw new IllegalArgumentException("Negative initial size: " + size); } buf = new byte[size];

Methods Summary
public void	close() 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() 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. see java.io.ByteArrayInputStream#count count = 0;
public int	size() Returns the current size of the buffer. return the value of the count field, which is the number of valid bytes in this output stream. see java.io.ByteArrayOutputStream#count return count;
public synchronized byte[]	toByteArray() 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. return the current contents of this output stream, as a byte array. see java.io.ByteArrayOutputStream#size() byte newbuf[] = new byte[count]; System.arraycopy(buf, 0, newbuf, 0, count); return newbuf;
public java.lang.String	toString(java.lang.String enc) Converts the buffer's contents into a string, translating bytes into characters according to the specified character encoding. param enc a character-encoding name. return String translated from the buffer's contents. throws UnsupportedEncodingException If the named encoding is not supported. since JDK1.1 return new String(buf, 0, count, enc);
public java.lang.String	toString(int hibyte) 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)) deprecated This method does not properly convert bytes into characters. As of JDK 1.1, the preferred way to do this is via the toString(String enc) method, which takes an encoding-name argument, or the toString() method, which uses the platform's default character encoding. param hibyte the high byte of each resulting Unicode character. return the current contents of the output stream, as a string. see java.io.ByteArrayOutputStream#size() see java.io.ByteArrayOutputStream#toString(String) see java.io.ByteArrayOutputStream#toString() return new String(buf, hibyte, 0, count);
public java.lang.String	toString() Converts the buffer's contents into a string, translating bytes into characters according to the platform's default character encoding. return String translated from the buffer's contents. since JDK1.1 return new String(buf, 0, count);
public synchronized void	write(int b) Writes the specified byte to this byte array output stream. param b the byte to be written. int newcount = count + 1; if (newcount > buf.length) { byte newbuf[] = new byte[Math.max(buf.length << 1, newcount)]; System.arraycopy(buf, 0, newbuf, 0, count); buf = newbuf; } buf[count] = (byte)b; count = newcount;
public synchronized void	write(byte[] b, int off, int len) Writes len bytes from the specified byte array starting at offset off to this byte array output stream. param b the data. param off the start offset in the data. param len the number of bytes to write. if ((off < 0) || (off > b.length) || (len < 0) || ((off + len) > b.length) || ((off + len) < 0)) { throw new IndexOutOfBoundsException(); } else if (len == 0) { return; } int newcount = count + len; if (newcount > buf.length) { byte newbuf[] = new byte[Math.max(buf.length << 1, newcount)]; System.arraycopy(buf, 0, newbuf, 0, count); buf = newbuf; } System.arraycopy(b, off, buf, count, len); count = newcount;
public synchronized void	writeTo(java.io.OutputStream out) 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). param out the output stream to which to write the data. exception IOException if an I/O error occurs. out.write(buf, 0, count);