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How to count Java comments of a program that is stored in a text file?
You can read the contents of a file using the Scanner class and You can find the comments in a particular line using contains() method.
Example
import java.io.*;
import java.util.Scanner;
public class FindingComments {
public static void main(String[] args) throws IOException {
Scanner sc = new Scanner(new File("HelloWorld"));
String input;
int single = 0;
int multiLine = 0;
while (sc.hasNextLine()) {
input = sc.nextLine();
if (input.contains("/*")) {
multiLine ++;
}
if(input.contains("//")) {
single ++;
}
}
System.out.println("no.of single line comments ::"+single);
System.out.println("no.of single line comments ::"+multiLine);
}
}Contents of the file HelloWorld −
Public class SampleProgram{
/* This is my first java program.
* This will print ‘Hello World’ as the output
*/
Public static void main(String args[]){
//Prints Hello World
System.out.println("Hello World");
}
}Output
no.of single line comments ::1 no.of single line comments ::1
Updated on: 16-Jun-2020
332 Views
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