Creates a <code>PushbackInputStream</code>
with a 1-byte pushback buffer, and saves its argument, the input stream
<code>inputStream</code>, for later use. Initially,
the pushback buffer is empty.
@param inputStream the input stream from which bytes will be read.
Creates a <code>PushbackInputStream</code> with a 1-byte pushback buffer, and saves its argument, the input stream <code>inputStream</code>, for later use. Initially, the pushback buffer is empty.
@param inputStream the input stream from which bytes will be read.