In this section we will discuss the I/O Buffered Streams.
In this section we will discuss the I/O Buffered Streams.
Java I/O Buffered Streams
In this section we will discuss the I/O Buffered Streams.
In Java programming when we are doing an input and output operation then we
are trying to interact our Java program to read from or write data to the
memory. In the perspective of Java we can do this in two ways :
Unbuffered : In an unbuffered way the read and write operations are
performed by the O/S directly, this may cause to much less efficiency of program
due to often triggering of disk access, network activity and other relative
operations.
Buffered : In a buffered way of programming read and write operations are
done through a memory area called buffer. In the read operation input streams
read data from the memory area and the native input API is called only on the
empty buffer and in the write operation the output stream writes data to a
buffer and the native output API is called only on the full buffer.
An unbuffered stream can be changed to the buffered stream by wrapping the
buffered stream classes. There are four buffered stream classes from which two
are the buffered byte stream classes and the other twos are the buffered
character streams classes these are as follows :
Video: How to use Buffered Streams in Java?
Buffered Byte Streams classes
Classes
Description
BufferedInputStream
This class makes input stream able for buffering the input.
BufferedOutputStream
This class provides the facility to write output from the buffer.
Methods of BufferedInputStream
available() : This method is used to get the number of
bytes that can be read from the input stream.
public int available()
throws IOException
close() : This method is used to close the resource and the
resource associated to the stream get released.
public void close()
throws IOException
mark(int readlimit) : This method is used to mark the
current position in the input stream.
public void mark(int readlimit)
markSupported() : This method is used to specify that
whether the input stream supported the mark() and reset() methods.
public boolean markSupported()
read() : This method is used to read the next byte of data
of input stream.
public abstract int read()
throws IOException
read(byte[] b, int off, int len) : This method is used to
read byte from the byte-input stream in a given byte array, started from the
specified offset.
public int read(byte[] b,
int off,
int len)
throws IOException
reset() : This method is used to repositioned the stream
where the mark method was marked the current position in the input stream.
public void reset()
throws IOException
skip(long n) : This method is used to skipped over and
discarded the data of n bytes from the input stream.
public long skip(long n)
throws IOException
Methods of BufferedOutputStream
flush() : This method is used to flush the output stream.
public void flush()
throws IOException
write(byte[] b, int off, int len) : This method is used to
write the specified length of bytes into the buffered output stream, started
from the given offset from the given byte array.
public void write(byte[] b,
int off,
int len)
throws IOException
write(int b) : This method is used to write the given byte
into the buffered output stream.
public void write(int b)
throws IOException
Buffered Character Stream Classes
Classes
Description
BufferedReader
This class facilitate to read texts from the character-input stream
BufferedWriter
This class facilitate to write character-output stream using buffer.
Methodd of BufferedReader
close() : This method is used to close the input stream
and the associated resources get released.
public void close()
throws IOException
mark(int readAheadLimit) : This method is used to mark the
current position in the input stream.
public void mark(int readAheadLimit)
throws IOException
markSupported() : This method specifies that whether the
mark() operation is supported by the stream or not.
public boolean markSupported()
read() : This method is used to read a single character.
public int read()
throws IOException
read(char[] cbuf, int off, int len) : This method is used
to read characters of an array at the specified portion.
public int read(char[] cbuf,
int off,
int len)
throws IOException
readLine() : This method is used to read the line of text.
public String readLine()
throws IOException
ready() : This method specifies that whether the stream
is ready for reading or not.
public boolean ready()
throws IOException
reset() : This method is used to repositioned the most
recent mark.
public void reset()
throws IOException
skip(long n) : This method is used to skipped over the
characters in the stream.
public long skip(long n)
throws IOException
Methods of BufferedWriter
close() : This method is used to close the stream.
public void close()
throws IOException
flush() : This method is used to flush the stream.
public void flush()
throws IOException
newLine() : This method is used to write into new line
i.e. used for the line seperator.
public void newLine()
throws IOException
write(char[] cbuf, int off, int len) : This method is used
to write the part of an array of characters.
public void write(char[] cbuf,
int off,
int len)
throws IOException
write(int c) : This method is used to write a single
character.
public void write(int c)
throws IOException
write(String s, int off, int len) : This method is used to
write a part of string.
public void write(String s,
int off,
int len)
throws IOException