Problem : How you can read line by line from a text file?

Contents

1. 1 Program :
   1. 1.1 Step 1 - Coding
   2. 1.2 Step 2 - Deployment
   3. 1.3 Step 3 - Testing
   4. 1.4 Output
2. 2 FAQ
   1. 2.1 What is BufferedReader?
   2. 2.2 Most Interesting methods in BufferedReader?

Solution : java.io.BufferedReader class has a readLine() method which stored data from java.io.FileReader class read() method and read file line by line. Below is sample program.

Program :

Step 1 - Coding

Create a text file c:/sunilos/ReadLine.java  and copy below contents.

import java.io.BufferedReader;
import java.io.FileReader;

/**
 * A program to read file line by line.
 */
public class ReadLine {

    public static void main(String[] args) throws Exception{
                //FileReader reads streams of characters
        FileReader reader = new FileReader("c:/sunilos/sunilos.txt");
                //BufferedRead read text from a character-input stream.
        BufferedReader bufferedReader = new BufferedReader(reader);
       
        String line = bufferedReader.readLine();
        while(line!=null){
            System.out.println(line);
            line = bufferedReader.readLine();
        }
        reader.close();
       
    }

}

Step 2 - Deployment

1. Create a folder 'c:\sunilos'. 
2. Create or copy ReadLine.java  into 'c:\sunilos' folder.
3. It is assumed that your hard drive has c:/sunilos/sunilos.txt file.
4. Open your command prompt and go to  'c:\sunilos'
   
5. Compile ReadLine.java with help of 
• javac ReadLine.java command.  Command will create ReadLine.class file in the same folder.
  
6. Congratulations!! your Java program is ready to serve.

Step 3 - Testing

1. Make sure you are on Command Prompt under c:\sunilos directory
   
2. Now start your java program from command prompt with help of
   
• java ReadLine command.

Output

A software services and corporate training company specializing in Distributed
Object Oriented and Client Server Technologies with a strong background of J2EE.

FAQ

What is BufferedReader?

• BufferedReader read text from a character-input stream, buffering characters so as to provide for the efficient reading of characters, arrays, and lines.

Most Interesting methods in BufferedReader?

• close() - Close the stream.
• mark() - Mark the present position in the stream.
• markSupported() - Tell whether this stream supports the mark() operation, which it does.
• read() - Read a single character.
• readLine() - Read a line of text.
• ready() - Tell whether this stream is ready to be read.
• skip(long) - Skip characters

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