Java BufferedInputStream Class

The BufferedInputStream class in Java is used to read data from an input stream efficiently by using an internal buffer.

In this chapter, we will learn what the BufferedInputStream class is, why it is used, its constructors, important methods, and how to read data from a file using an example.

What is BufferedInputStream in Java?

The BufferedInputStream class is used to read data from an input stream with better performance. It uses an internal buffer to store data temporarily, which reduces the number of read operations from the underlying input stream.

When data is read or skipped, the buffer is automatically refilled with multiple bytes at once. This makes input operations faster compared to reading data byte by byte directly from the stream.

Java BufferedInputStream class declaration

Let's see the declaration for Java.io.BufferedInputStream class:

Constructors of BufferedInputStream Class

The BufferedInputStream class provides constructors to create a buffered input stream with or without a custom buffer size.

1. BufferedInputStream(InputStream in)

This constructor creates a BufferedInputStream using the specified input stream and a default buffer size.

Syntax:

Here is the syntax of this constructor:

2. BufferedInputStream(InputStream in, int size)

This constructor creates a BufferedInputStream using the specified input stream and a custom buffer size.

Syntax:

Here is the syntax of this constructor:

Example of BufferedInputStream Constructors

The following examples demonstrate how to create a BufferedInputStream using its constructors.

Output:

TpointTech

Java BufferedInputStream class methods

The BufferedInputStream class provides several methods to read data.

Example of BufferedInputStream Class

In this example, data is read from a file using BufferedInputStream, which improves performance by reading data through a buffer.

Here, we are assuming that you have following data in "testout.txt" file:

javaTpoint

Output:

javaTpoint