java中的io流问题 FileInputStream中的read()返回的int类型是读取字节的

Question

java中的io流问题
FileInputStream中的read()返回的int类型是读取字节的ASCLL编码么？是一个一个字节读？
BufferedInputStream中的read()返回的是读入字节的长度吗？是一段一段的读吗？谢谢了，感觉好疑惑

Answer 1

不是，两个都是返回Ascll编码，bufferInputStream是缓冲流，提高效率

Answer 2

FileInputStream是基础类，字节流，按字节读取。BufferedInputStream是包装类，处理流，先将数据读于缓冲区，然后再读取

Answer 3

看源码啊，FileInputStream/*** Reads a byte of data from this input stream. This method blocks* if no input is yet available.** @return the next byte of data, or <code>-1</code> if the end of the* file is reached.* @exception IOException if an I/O error occurs.*/public native int read() throws IOException;BufferedInputStream/*** See* the general contract of the <code>read</code>* method of <code>InputStream</code>.** @return the next byte of data, or <code>-1</code> if the end of the* stream is reached.* @exception IOException if this input stream has been closed by* invoking its {@link #close()} method,* or an I/O error occurs.* @see java.io.FilterInputStream#in*/public synchronized int read() throws IOException {if (pos >= count) {fill();if (pos >= count)return -1;}return getBufIfOpen()[pos++] & 0xff;}