JAVA学习日志：FileInputStream的read()读取为顺序读取

调用FileInputStream中的read()方法时，read()从输入流中读取的字节是按顺序读取的，并且只读一遍，比如下面的示例代码中，"test.txt"文件里有"abcdef"，每次读取3个字符，则第一次读取的为abc，第二次读取的为def。

示例代码：

FileInputStream fis=new FileInputStream("test.txt");

byte[] b=new byte[10];

while(true){

fis.read(b,0,3);

}

至于为什么顺序读取，看它继承的父类inputStream中的方法read()说明中有写道。

public abstract int read()

                  throws IOException

Reads the next byte of data from the input stream. The value byte is returned as an int in the range 0 to 255. If no byte is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.