» » » Java read file line by line example program

  • Reading a text file line by line in java can be done by using java.io.BufferedReader .
  • Create a BufferedReader class by passing new FileReader(new File("filename")) object to it's constructor.
  • By using readLine() method of  BufferedReader class we can read line by line text from a text file as Strings.
  • Lets see a java example program on hoe to read data from file line by line using BufferedReader class readLine() method.
  • Java read lines from text file example program.


#1: Java Example program to read file line by line

 

  1. package com.instanceofjava.readfile;
  2.  
  3. import java.io.BufferedReader;
  4. import java.io.File;
  5. import java.io.FileReader;
  6. import java.io.IOException;
  7. /** *  * 
  8. @author www.instanceofjava.com 
  9. * @category: Interview Programs 
  10. * @description: How to read text file line by line in java example program 
  11. * */
  12.  
  13. public class ReadFile {
  14.  
  15.     public static void main(String[] args) {        
  16.         
  17.         try {            
  18.            File fileName = new File("E:\\data.txt");
  19.             FileReader fileReader = new FileReader(fileName);     
  20.             BufferedReader bufferedreader = new BufferedReader(fileReader);           
  21.             StringBuffer sb = new StringBuffer();
  22.             String strLine;            
  23.            while ((strLine = bufferedreader.readLine()) != null) {
  24.                 sb.append(strLine);
  25.                 sb.append("\n");        
  26.             }         
  27.            fileReader.close();
  28.            System.out.println(sb.toString()); 
  29.          } catch (IOException e) {
  30.             e.printStackTrace();     
  31.    }
  32.  
  33.     }
  34.  
  35. }

Output:

  1. java read file line by line example
  2. java read file line by line java 8
  3. java read lines from text file 
  4. example bufferedreader java example

#2: Java example program to read text file line by line using java 7 try with resource example



read file line by line java


#3: Java example program to read text file line by line using java 8 example (Using stream)

  1. package com.instanceofjava.readfile;
  2. import java.io.IOException;
  3. import java.nio.file.Files;
  4. import java.nio.file.Paths;
  5. import java.util.stream.Stream;
  6. /**
  7.  *
  8. * @author www.instanceofjava.com
  9.  * @category: Interview Programs 
  10. * @description: How to read text file line by line in java example program using java 8 stream
  11. */
  12. public class ReadFile {
  13. public static void main(String[] args) throws IOException {
  14.  
  15. try (Stream<String> stream = Files.lines(Paths.get("E:\\data.txt"))) 
  16. {           
  17.  
  18.  stream.forEach(System.out::println);
  19.  
  20. }
  21. }
  22. }

Instance Of Java

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