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java中的io流問題 FileInputStream中的read()返回的int類型是讀取字節(jié)的

Java

慕尼黑5688855 2019-03-21 14:14:55

java中的io流問題FileInputStream中的read()返回的int類型是讀取字節(jié)的ASCLL編碼么？是一個一個字節(jié)讀？BufferedInputStream中的read()返回的是讀入字節(jié)的長度嗎？是一段一段的讀嗎？謝謝了，感覺好疑惑

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3 回答

慕運維8079593

TA貢獻1876條經(jīng)驗獲得超5個贊

不是，兩個都是返回Ascll編碼，bufferInputStream是緩沖流，提高效率

反對回復 2019-03-29

蝴蝶刀刀

TA貢獻1801條經(jīng)驗獲得超8個贊

FileInputStream是基礎類，字節(jié)流，按字節(jié)讀取。
BufferedInputStream是包裝類，處理流，先將數(shù)據(jù)讀于緩沖區(qū)，然后再讀取

反對回復 2019-03-29

千巷貓影

TA貢獻1829條經(jīng)驗獲得超7個贊

看源碼啊，F(xiàn)ileInputStream

/**
* 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;
}