JAVA IO InputStream InputStreamReader BufferedReader

InputStream, OutputStream

The abstract class that handles the byte stream, InputStream can read a byte from the source, so it is the lowest level. InputStream is a superclass of all classes of byte input streams, generally we use its subclasses, such as FileInputStream, etc.

InputStreamReader OutputStreamWriter

The abstract class that handles the character stream is a bridge of bytes flowing to the character stream, which converts the byte stream into a character stream. It reads one character at a time in a higher-level manner.

BufferedReader BufferedWriter

BufferedReader is more advanced than InputStreamReader and reads one line at a time.

InputStream is a byte-by-byte read, each time the read will execute an IO, we know that the operation of the IO is very time-consuming, which will inevitably lead to the efficiency of the program, and bufferedreader a good solution to this problem, it can read a large number of data, Greatly reduce the number of Io, efficiency is up

Three layers of progressive, so we often see this use:

FileInputStream fis=New FileInputStream ("D://desktop//test.txt");

InputStreamReader isr=New InputStreamReader (FIS,"UTF8");

BufferedReader br=New BufferedReader (ISR);

Get input to the keyboard:

BufferedReader bufr = new BufferedReader (new InputStreamReader (system.in));

Similar to scanner, but more powerful than scanner, because scanner cannot get input with a space, enter key

JAVA IO InputStream InputStreamReader BufferedReader