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How to count the number of lines in a text file using Java?
To count the number of lines in a file
- Instantiate the FileInputStream class by passing an object of the required file as parameter to its constructor.
- Read the contents of the file to a bytearray using the read() method of FileInputStream class.
- Instantiate a String class by passing the byte array obtained, as a parameter its constructor.
- Now, split the above string into an array of strings using the split() method by passing the regular expression of the new line as a parameter to this method.
- Now, find the length of the obtained array.
Example
import java.io.File;
import java.io.FileInputStream;
public class NumberOfCharacters {
public static void main(String args[]) throws Exception{
File file = new File("data");
FileInputStream fis = new FileInputStream(file);
byte[] byteArray = new byte[(int)file.length()];
fis.read(byteArray);
String data = new String(byteArray);
String[] stringArray = data.split("\r
");
System.out.println("Number of lines in the file are ::"+stringArray.length);
}
}data
Output
Number of lines in the file are ::3
Updated on: 20-Feb-2020
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