Java program calculates the number of lines existing in a file

Java Examples Comprehensive

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

Example1Java program to count the number of lines in a file using the 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 a Scanner object　
　　　　　　//Associate with the file
　　　　　　Scanner sc = new Scanner(file);
　　　　　　//Read each line, then
　　　　　　//Count the number of lines
　　　　　　while(sc.hasNextLine()) {
　　　　　　　　sc.nextLine();
　　　　　　　　count++;
　　　　　　}
　　　　　　count);　+　catch (Exception e) {
　　　　　　//　Close the scanner
　　　　　　sc.close();
　　　　}
　　　　　　e.getStackTrace();
　　　　}
　　}
}

In the above example, we used the nextLine() method of the Scanner class to access each line of the file. Here, according to the number of lines in the file input.txt, the program will display the output.

In this case, our file name is input.txt and it contains the following content:

First Line
Second Line
Third Line

Therefore, we will get the output

Total lines:　3

Example2Java programs use the java.nio.file package to count the number of lines in a file

import java.nio.file.*;
class Main {
　　public static void main(String[] args) {
　　　　try {
　　　　　　//Establish a connection with the file
　　　　　　Path file = Paths.get("input.txt");
　　　　　　//Read all lines of the file
　　　　　　long count = Files.lines(file).count();
　　　　　　count);　+　catch (Exception e) {
　　　　}
　　　　　　e.getStackTrace();
　　　　}
　　}
}

In the above example,

• lines() - Read all lines of the file in stream form

• count() - Return the number of elements in the stream

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

This is an article about Java examples.
These examples calculate the number of lines in the file.
Here, we use the java.nio.file package.

The program will printTotal Number of Lines:3.

Java Examples Comprehensive