How to get the total number of lines of a file in Java?

Question:

How to get the total number of lines of a file in Java?

Code:

import java.io.FileReader;
import java.io.IOException;
import java.io.LineNumberReader;
 
public class CountLines {
 
  public static void main(String[] args) {
 
    try{
 
      FileReader fr = new FileReader("./CountLines.java");
      LineNumberReader lnr = new LineNumberReader(fr);
 
      int count = 0;
 
      while (lnr.readLine() != null){
        count++;
      }
      System.out.println("Total number of lines : " + count);
      lnr.close();
 
    } catch(IOException e) {
      System.out.println(e);
    }
 
  }
}

Output:

$ java CountLines
Total number of lines : 27

$ wc -l CountLines.java 
27 CountLines.java