Learn Java by Example: Java Program to Count number of lines present in the file

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Java Program to Count number of lines present in the file

In this example, we will learn to count the number of lines present in a file in Java.


Example 1: Java program to count the number of lines in a file using Scanner class


import java.io.File;
import java.util.Scanner;

class Main{
  public static void main(String[] args){

    int count = 0;

    try {
      // create a new file object
      File file = new File("input.txt");

      // create an object of Scanner
      // associated with the file
      Scanner sc = new Scanner(file);

      // read each line and
      // count number of lines
      while(sc.hasNextLine()) {
        sc.nextLine();
        count++;
      }
      System.out.println("Total Number of Lines: " + count);

      // close scanner
      sc.close();
    } catch (Exception e) {
      e.getStackTrace();
    }
  }
}

In the above example, we have used the nextLine() method of the Scanner class to access each line of the file. Here, depending on the number of lines the file input.txt file contains, the program shows the output.

In this case, we have a file name input.txt with the following content


First Line
Second Line
Third Line

So, we will get output

Total Number of Lines: 3

Example 2: Java program to count the number of lines in a file using java.nio.file package


import java.nio.file.*;

class Main{
  public static void main(String[] args){

    try {

      // make a connection to the file
      Path file = Paths.get("input.txt");

      // read all lines of the file
      long count = Files.lines(file).count();
      System.out.println("Total Lines: " + count);

    } catch (Exception e) {
      e.getStackTrace();
    }
  }
}

In the above example,

  • lines() – read all lines of the file as a stream
  • count() – returns the number of elements in the stream

Here, if the file input.txt contains the following content:

This is the article on Java Examples.
The examples count number of lines in a file.
Here, we have used the java.nio.file package.

The program will print Total Lines: 3.

 

 

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