How Can A Large Text File Be Read Line By Line Using Java?

To read a large text file line by line using Java, you can use the following code snippet:

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

public class ReadFileLineByLine {
    public static void main(String[] args) {
        String filePath = "path/to/your/file.txt";

        try (BufferedReader br = new BufferedReader(new FileReader(filePath))) {
            String line;
            while ((line = br.readLine()) != null) {
                // Process the line as required
                System.out.println(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

In this code:

  1. Change the filePath variable to the actual path of your large text file.
  2. The BufferedReader class reads the file efficiently, and the readLine() method reads a line from the file.
  3. The while loop continues until all the lines in the file have been read.
  4. Inside the loop, you can process each line as required. In the given example, the line is printed to the console, but you can modify this code to apply any desired processing to each line.

Note that this code uses Java 7’s try-with-resources mechanism to automatically close the BufferedReader after it’s no longer needed.

About the Author Rex

I'm a passionate tech blogger with an insatiable love for programming! From my early days tinkering with code, I've delved into web dev, mobile apps, and AI. Sharing insights and tutorials with the world is my joy, connecting me to a global community of like-minded tech enthusiasts. Python holds a special place in my heart, but I embrace all challenges. Constantly learning, I attend tech conferences, contribute to open-source projects, and engage in code review sessions. My ultimate goal is to inspire the next generation of developers and contribute positively to the ever-evolving tech landscape. Let's code together!