Java Bufferedreader Class

One of the numerous tools provided in Java's comprehensive standard library is the BufferedReader class, which is recognized for its adaptability and effectiveness in processing character input from diverse origins. The Java BufferedReader class is employed for reading text from a character-oriented input stream. It facilitates reading data line by line through the readLine method, enhancing performance speed. This class is a subclass of the Reader class.

Java BufferedReader Class Declaration

Within Java's java.io package, the BufferedReader class presents a practical solution for extracting text from an input stream. This class is an extension of the abstract Reader class. It introduces enhanced features for input buffering, which is beneficial in situations necessitating the retrieval of character-based information, like parsing textual documents or managing network interactions.

Now, let's examine the declaration of the Java.io.BufferedReader class:

public class BufferedReader extends Reader

Java BufferedReader Class Constructors

Java BufferedReader Class Methods

Java BufferedReader Example

In this instance, we are retrieving information from the text file named testout.txt by utilizing the Java BufferedReader class.

BufferedReaderExample.java

package com.example;

import java.io.*;

public class BufferedReaderExample {

	public static void main(String args[])throws Exception{  

		  FileReader fr=new FileReader("D:\\testout.txt");  

		  BufferedReader br=new BufferedReader(fr);  



		  int i;  

		  while((i=br.read())!=-1){

		  System.out.print((char)i);

		  }

		  br.close();  

		  fr.close();  

	}  

}

In this scenario, we are considering that the data is stored in a file named "testout.txt":

Output:

Welcome to Java.

Closing the BufferedReader

It is crucial to remember that upon completing the use of a BufferedReader, it is necessary to close it to free up any system resources linked to it, like file handles or network connections. In the provided instance, a try-with-resources statement is employed to guarantee the automatic closure of the BufferedReader when it is no longer required.

Reading data from console by InputStreamReader and BufferedReader

In this instance, we are establishing a connection between the BufferedReader stream and the InputStreamReader stream to read data line by line from the keyboard.

BufferedReaderExample.java

package com.example;

import java.io.*;

public class BufferedReaderExample{  

public static void main(String args[])throws Exception{  		  

	InputStreamReader r=new InputStreamReader(System.in);  

	BufferedReader br=new BufferedReader(r);  		  

	System.out.println("Enter your name");  

	String name=br.readLine();  

	System.out.println("Welcome "+name);  

}  

}

Output:

Enter your name

Nakul Jain

Welcome Nakul Jain

An additional illustration of how to continuously read input from the console until the user enters the command "stop".

In this instance, we are continuously reading and displaying information until the user enters the command "stop".

BufferedReaderExample.java

package com.example;

import java.io.*;

public class BufferedReaderExample{  

public static void main(String args[])throws Exception{  		  

	 InputStreamReader r=new InputStreamReader(System.in);  

	 BufferedReader br=new BufferedReader(r);  		  

	 String name="";  

	 while(!name.equals("stop")){  

	  System.out.println("Enter data: ");  

	  name=br.readLine();  

	  System.out.println("data is: "+name);  

	 }  		  

	br.close();  

	r.close();  

	}  

	}

Output:

Enter data: Nakul

data is: Nakul

Enter data: 12

data is: 12

Enter data: stop

data is: stop

Java's BufferedReader class is a robust and efficient tool for reading character input from diverse origins. It enhances input handling by buffering data and providing user-friendly functions for text reading. This simplifies the management of input streams, making it a valuable asset for a wide range of activities such as file operations and network interactions. Whether you are dealing with extensive text files or communicating with external data repositories, BufferedReader equips Java programmers with the necessary utilities to effectively manage input streams within their software.