BufferedInputStream in Java | Methods, Example BufferedInputStream is a java BufferedInputStream class that can read and write data in chunks of a specified size. The idea is that you can read in data from a source, and then append or append-and-concatenate that data with data that you are writing to a destination.
BufferedInputStream in Java | Methods, Example This article explains the BufferedInputStream class in Java. BufferedInputStream is a class in java.io package, which is used for reading the data from the input stream. It can be used in various application in any programming language. Let us look at the various methods of this class.
As we learn more about Java and its language features, we are less interested in the details and more interested in the common patterns. So, here is a list of the most common Java input streams and their method calls.
BufferedInputStream in Java is a special subclass of FilterInputStream that encapsulates (buffers) an input stream into a buffered stream and makes reading streams more efficient and faster. Simply put, it adds buffering functions to an input stream that temporarily store data (in bytes) in a buffer when the stream is read. It is used to speed up input by reducing the number of reads from disk or a file by adding an extra layer of functionality around the underlying thread. For example. B. FileInputStream and FileOutputStream in Java are not buffered, i.e., each read and write request is processed directly by the operating system. This makes the program less efficient because it accesses the disk or file with each read or write command. This leads to a great waste of time. On the other hand, if we buffer a file’s input data with, say. B. Wrap a FileInputStream into a BufferedInputStream, the buffered stream stores the data in a temporary block of buffer memory. And then the data in the buffer is sent to the program one by one. Thus, the buffered input stream in Java makes file operations more efficient and faster.
Working with BufferedInputStream in Java
In Java BufferedInputStream, the buffer is inside between the program and the source. During a read operation, the entire data block (in bytes) is read from the hard disk and buffered once in memory in the internal buffer. The data is then transferred (read) one by one from the buffer to the program, as shown in the following figure. 
The main points about BufferedInputStream in Java are the following:
- When input data (in bytes) is skipped or read from a stream, the buffered stream is automatically fed with more data from the input stream at the same time.
- When an object BufferedInputStream is created, a buffered array is created in it.
- Buffers can be built using the BufferedInputStream and BufferedOutputStream classes.
Declaring a Java BufferedInputStream class
The BufferedInputStream class is derived from the FilterInputStream class, whose base class is InputStream. It implements the interfaces Closeable and AutoCloseable. The general declaration of the BufferedInputStream class is: public class BufferedInputStream extends FilterInputStream implements Closeable, AutoCloseable. BufferedInputStream was added in Java version 1.0. It is available in the java.io.BufferedInputStream package.
Constructor of the class BufferedInputStream
To envelop an InputStream, the BufferedInputStream class defines two constructors, as follows: 1. BufferedInputStream(InputStream inputStream) : This constructor creates a BufferedInputStream object that buffers the input stream specified in inputStream. The default buffer size is used. The default internal buffer size is 8192 bytes. The general syntax for including a FileInputStream in a BufferedInputStream is as follows: // Creates an instance of FileInputStream with the specified file path. FileInputStream fis = new FileInputStream(String path) ; // Creates a BufferedInputStream object and passes the reference variable fis to the constructor. // Wraps a stream of files into a BufferedInputStream. BufferedInputStream buffer = new BufferInputStream(fis) ; 2. BufferedInputStream(InputStream inputStream, int size) : This constructor creates a BufferedInputStream object that buffers the input stream with the specified buffer size. The general syntax for including a FileInputStream in a buffered stream is as follows: // Creates the BufferedInputStream object with the specified internal buffer size. BufferedInputStream buffer = new BufferInputStream(fis, int size) ; Now perform all I/O operations on the buffered stream. Finally, close the buffered stream by calling the close() method. Closing the buffered stream automatically closes the underlying file stream. If an error occurs, an exception called IOException is thrown.
BufferedInputStream methods in Java
The BufferedInputStream class does not define new methods. All methods of BufferedInputStream are inherited from the InputStream class. Some important methods are listed below: 1. int available() : This method returns the number of bytes available in the input stream without locking. 2. int read() : This method reads the next byte of data from the buffered input stream. 3. read(byte[ ] arr) : Reads the bytes from the buffered input stream and stores them in the specified array. 4. int read(byte[ ] b, int n, int m) : It reads up to m bytes of data from this input stream and stores them in a byte array, starting with the nth byte. 5. void close() : This method closes the buffered input stream and releases all system resources associated with the stream. 6. void reset() : It moves the buffered input stream to the last marked position. 7. long skip(long x) : This method ignores and removes x bytes of data from the buffered input stream. 8. void mark(int readlimit) : This method marks the current position in the buffered input stream. 9. boolean markSupported() : It is checked whether the buffered input stream supports the mark and reset methods.
Example program based on Java BufferedInputStream
1. Let’s look at a simple example of a program that reads data from the myfile using BufferedInputStream. Take a look at the source code to understand it better. Program source code 1 : package javaProgram; import java.io.BufferedInputStream; import java.io.FileInputStream; public class BufferedInputStreamEx { public static void main(String[] args) { try { // Create a FileInputStream object to connect my file to FileInputStream. FileInputStream fis = new FileInputStream(D:\myfile.txt) ; // Create a BufferedInputStream object to convert a FileInputStream into a BufferedInputStream. BufferedInputStream bis = new BufferedInputStream(fis) ; int i = 0;while ((i = bis.read()) != -1) {char ch = (char)i;System.out.println(ch);}bis.close();fis.close();}catch(Exception e){System.out.println(e);} Exit: Welcome at In this example program, 1. We created a buffered input stream named bis and connected it to the FileInputStream fis. 2. Then, using the while loop and the read() method, we read all the bytes from the internal buffer and send them to the console. We assume here that you have the following data in your myfile.txt file: Welcome. 2. Let’s create a program that determines the number of bytes available in the input stream. We will use the method available() for this. Program source code 2 : package javaProgram; import java.io.BufferedInputStream; import java.io.FileInputStream; public class BufferedInputStreamEx { public static void main(String[] args) { try { // Create a FileInputStream object to connect my file to FileInputStream. FileInputStream fis = new FileInputStream(D:\myfile.txt) ; // Create a BufferedInputStream object to convert a FileInputStream into a BufferedInputStream. BufferedInputStream bis = new BufferedInputStream(fis) ; // Call the method available() to get the number of bytes available in the BufferedInputStream. System.out.println(Bytes available at start: + to.available()) ; // Reads bytes from file to.read() ; to.read() ; to.read() ; //Askes for the number of bytes available at the end. System.out.println(Available end bytes: + bis.available()); bis.close(); }catch(Exception e) { System.out.println(e); } }} Exit: Bytes available at the beginning : 25 Bytes available at the end : 22 In this example program, 1. First, we use the method available() to check the number of bytes available in the buffered input stream. 2. Next, we used the read() method 3 times to read 3 bytes from the buffered input stream. 3. After reading three bytes, we again check the number of bytes available in the input stream. This time the number of bytes available is 22. 3. Let’s create a program that removes and skips a certain number of bytes from the input stream. We will use the skip() method to do this. Program source code 3 : package javaProgram; import java.io.BufferedInputStream; import java.io.FileInputStream; public class BufferedInputStreamEx { public static void main(String[] args) { try { // Create a FileInputStream object to connect my file to FileInputStream. FileInputStream fis = new FileInputStream(D:\myfile.txt) ; // Create a BufferedInputStream object to convert a FileInputStream into a BufferedInputStream. BufferedInputStream bis = new BufferedInputStream(fis) ; // skip 5 bytes of the buffered input stream. to.skip(5); System.out.println(Input stream after skipping the first 5 bytes:); // Reads all available bytes from the buffered input stream after skipping.int i = 0;while ((i = bis.read()) != -1) {System.out.print((char) i);}bis.close();}catch(Exception e){System.out.println(e);}} Exit: Input current after the first 5 bytes are skipped : I’m going to In this example program, we use the skip() method to skip the first 5 bytes of the buffered input stream and display the rest on the console. The missing bytes are W, e, l, c, o, m, e and . I hope this tutorial has covered almost all important points about BufferedInputStream in Java with example programs. I hope you understand the basics of the BufferedInputStream class and the example programs. Thanks for reading!!!BufferedInputStream is a class used to manipulate a stream of data. The class of this article is used to manipulate a stream of data when writing to a file. The class of this article is used to manipulate a stream of data when reading from a file.. Read more about bufferedinputstream java 8 and let us know what you think.
Frequently Asked Questions
What is BufferedInputStream in Java?
BufferedInputStream is sometimes used as a java stream, which is a sequence of data that is read sequentially and that can be read by a single stream. By default, if the input buffer is not full, it will be read from the buffer in a single shot. In this article, you will learn about the BufferedInputStream class and its various methods. BufferedInputStream is a class that is used to process data in an asynchronous manner. The input data is not stored in collections and instead, is buffered before being read. Once the data is read, it is then processed.
How do I read BufferedInputStream?
BufferedInputStream is an interface in the java.io package that stores data in memory and one of its useful methods is InputStream.read(byte[]). What is it good for? It can be used to read files and strings easily. BufferedInputStream is a class provided by java.io package that produces an output stream that is buffered for a specified time. The output stream is unreadily readable by the calling thread. The time is specified by the java.nio.ByteBuffer ‘s bufferSize, which can be set by the user or supplied by the system. BufferedInputStream buffers data until the specified number of bytes is output then it will flush the buffer.
Which Java package does the Java class BufferedInputStream belong to?
BufferedInputStream is one of the many classes that come with the java.io package, which are used to transfer data from one place to another over a network connection. The java.io package is a collection of classes and interfaces that are used to interact with a computer’s I/O devices. The java.io package provides methods for managing streams of data and provides functions to read and write data. The Java class BufferedInputStream is one of many classes that exist in the java.io package. These classes are of major importance to the java developers and they are mostly used by java application developers to read and write data. Among the many classes of java.io package, BufferedInputStream is a very important class that is used in many different programing languages and applications.
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