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

#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. */
13. public class ReadFile {
14. public static void main(String[] args) throws IOException {
15.  
16. try (Stream<String> stream = Files.lines(Paths.get("E:\\data.txt"))) 
17. {           
18.  
19.  stream.forEach(System.out::println);
20.  
21. }
22. }
23. }