Class ByteArrayOutputStream

  • All Implemented Interfaces:
    Closeable, Flushable, AutoCloseable

    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.

    This is an alternative implementation of the ByteArrayOutputStream class. The original implementation only allocates 32 bytes at the beginning. As this class is designed for heavy duty it starts at 1024 bytes. In contrast to the original it doesn't reallocate the whole memory block but allocates additional buffers. This way no buffers need to be garbage collected and the contents don't have to be copied to the new buffer. This class is designed to behave exactly like the original. The only exception is the deprecated toString(int) method that has been ignored.

    • Constructor Detail

      • ByteArrayOutputStream

        public ByteArrayOutputStream()
        Creates a new byte array output stream. The buffer capacity is initially 1024 bytes, though its size increases if necessary.
      • ByteArrayOutputStream

        public ByteArrayOutputStream​(int 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
    • Method Detail

      • write

        public void write​(byte[] b,
                          int off,
                          int len)
        Write the bytes to byte array.
        Overrides:
        write in class OutputStream
        Parameters:
        b - the bytes to write
        off - The start offset
        len - The number of bytes to write
      • write

        public void write​(int b)
        Write a byte to byte array.
        Specified by:
        write in class OutputStream
        Parameters:
        b - the byte to write
      • write

        public int write​(InputStream in)
                  throws IOException
        Writes the entire contents of the specified input stream to this byte stream. Bytes from the input stream are read directly into the internal buffers of this streams.
        Parameters:
        in - the input stream to read from
        Returns:
        total number of bytes read from the input stream (and written to this stream)
        Throws:
        IOException - if an I/O error occurs while reading the input stream
        Since:
        1.4
      • close

        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.
        Specified by:
        close in interface AutoCloseable
        Specified by:
        close in interface Closeable
        Overrides:
        close in class OutputStream
        Throws:
        IOException - never (this method should not declare this exception but it has to now due to backwards compatibility)
      • toByteArray

        public byte[] toByteArray()
        Gets the current contents of this byte stream as a byte array. The result is independent of this stream.
        Returns:
        the current contents of this output stream, as a byte array
        See Also:
        ByteArrayOutputStream.toByteArray()