How to read a specific line from a text file in Java
By Saruque Ahamed MollickIn this Java tutorial, I will show you the easiest way to read a specific line from a text file in Java. There is not only a single number of way to do this. There are a lot of ways to achieve your goal. But here in this tutorial, we will use the simplest way.
First of all, the text file can be small or large. Depending on the file size we should use the method so that our code works faster and efficiently.
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Java Program to read a specific line from a text file in Java
The below code can be used, later we will discuss several other methods. Choose the easiest method for you.
import java.io.*;
public class Readline {
public static void main(String[] args) {
String text = "";
int lineNumber;
try {
FileReader readfile = new FileReader("myfile.txt");
BufferedReader readbuffer = new BufferedReader(readfile);
for (lineNumber = 1; lineNumber < 10; lineNumber++) {
if (lineNumber == 7) {
text = readbuffer.readLine();
} else
readbuffer.readLine();
}
} catch (IOException e) {
e.printStackTrace();
}
System.out.println(" The specific Line is: " + text);
}
}
Read a specific line from a text file Java ( For small files)
The easiest way for small files is:
String specific_line_text = Files.readAllLines(Paths.get("myfile.txt")).get(n)You just need to put the line number instead of n in the get() method’s parameter.
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For example, if you want to get the particular line from a text file and the line number which you want to get is 11. Then you can use the below code
String specific_line_text = Files.readAllLines(Paths.get("file.txt")).get(11);
Read a particular line from a text file Java ( For large files)
try (Stream<String> all_lines = Files.lines(Paths.get("myfile.txt"))) {
specific_line_n = all_lines.skip(n-1).findFirst().get();
}
Assume that you need to find the text of line number 15.
Then you can use
try (Stream<String> all_lines = Files.lines(Paths.get("myfile.txt"))) {
specific_line_15 = all_lines.skip(14).findFirst().get();
}
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hi i used the below one you mentioned.
String line = Files.readLines(aFile).get(lineNumber);
but Files is not getting imported its in which package.
Are you sure that
files.readLines()works?I am trying to read all lines of the file by using the first code but I dont know which part of the code to change.
can you help pls
Remove the if condition where it checks for a specific line.
How can I replace a particular line of a text file, without even knowing its content?
Hi,
While fetching the specific line using:
String specific_line_text = Files.readAllLines(Paths.get(“file.txt”)).get(11);
the output return’s me the 12th Line in the file rather than the 11th line,
Could you please explain how it does that?
Check if you have any blank line. Also, check get(0). Maybe it starts from 0 for line 1. Just give it a try
First of all, indentation is horrible. It doesn’t even look like you tried. I mean, look. It’s messy. The main method is 2 tabs far from where it actually should be, and everything that’s in the main method has an even shorter indentation when it should be longer.
Thanks for your comment. At that time I was not aware of these things and I just wanted to help the beginners. I hope this piece of code still works good. Thanks again.