public class ByteArrayOutputStream extends OutputStream
This class implements an output stream in which the data is written into a byte array. The buffer automatically grows as data is written to it. The data can be retrieved using toByteArray() and toString().
Closing a ByteArrayOutputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.
protected byte[] buf
The buffer where data is stored.
protected int count
The number of valid bytes in the buffer.
public ByteArrayOutputStream()
Creates a new byte array output stream. The buffer capacity is initially 32 bytes, though its size increases if necessary.
public ByteArrayOutputStream(int size)
Creates a new byte array output stream, with a buffer capacity of the specified size, in bytes.
size - the initial size.IllegalArgumentException - if size is negative.public void write(int b)
Writes the specified byte to this byte array output stream.
write in class OutputStream
b - the byte to be written.public 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.
write in class OutputStream
b - the data.off - the start offset in the data.len - the number of bytes to write.public void writeTo(OutputStream out)
throws IOException 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).
out - the output stream to which to write the data.IOException - if an I/O error occurs.public 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.
ByteArrayInputStream.countpublic 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.
size()public int size()
Returns the current size of the buffer.
count field, which is the number of valid bytes in this output stream.countpublic String toString()
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 CharsetDecoder class should be used when more control over the decoding process is required.
toString in class Object
public String toString(String charsetName)
throws UnsupportedEncodingException Converts the buffer's contents into a string by decoding the bytes using the named charset. 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 CharsetDecoder class should be used when more control over the decoding process is required.
charsetName - the name of a supported charset
UnsupportedEncodingException - If the named charset is not supported@Deprecated public String toString(int hibyte)
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.
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))
hibyte - the high byte of each resulting Unicode character.size(), toString(String), toString()
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.
close in interface Closeable
close in interface AutoCloseable
close in class OutputStream
IOException - if an I/O error occurs.
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Documentation extracted from Debian's OpenJDK Development Kit package.
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