How to get last modified date of given file in Java?



Problem Description :


Write a program in Java that prints last modified date of given file.

Concept :


It is more simple than getting file creation date of given file. We just need to use following method of File class that is present in java.io.* package.

public long lastModified() - It returns time in milliseconds, we need to convert this time into Date.


Recommended :




Java Program :


package com.javamultiplex.FileHandling;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;

/**
 * 
 * @author Rohit Agarwal
 * @category File Handling
 * @problem How to get last modified date of given file?
 *
 */
public class FileLastModifiedDate {

 public static void main(String[] args) throws IOException {

  Scanner input = null;
  try {
   input = new Scanner(System.in);
   System.out.println("Enter file name with extension : ");
   String fileName = input.nextLine();
   if (isValidFileName(fileName)) {
    //file is present in current working directory.
    File file = new File(fileName);
    if (file.exists()) {

     long time = file.lastModified();
     String dateTime = getStringFromFileTime(time);
     System.out.println("Last modified date and time is : " + dateTime);

    } else {
     System.out.println("File doesn't exist in current directory.");
    }
   } else {
    System.out.println("File name is not valid.");
   }
  } finally {
   if (input != null) {
    input.close();
   }
  }
 }

 private static String getStringFromFileTime(long time) {

  Date date = new Date();
  // setting milliseconds.
  date.setTime(time);
  SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss a");
  // Convert Date to String.
  String dateTime = dateFormat.format(date);
  return dateTime;

 }

 private static boolean isValidFileName(String fileName) {

  //Regular expression for validating file name.
  String pattern = "^.+\\..+$";
  boolean result = false;
  if (fileName.matches(pattern)) {
   result = true;
  }
  return result;
 }

}



Output :


Output of Java program that prints last modification date of given file.
Output - How to get last modification date of given file in Java?

References :


https://docs.oracle.com/javase/7/docs/api/java/io/File.html#lastModified()

https://docs.oracle.com/javase/7/docs/api/java/io/File.html

https://en.wikipedia.org/wiki/Regular_expression


Thank you friends, I hope you have clearly understood the solution of this problem. If you have any doubt, suggestion or query please feel free to comment below. You can also discuss this solution in our forum.

Tags : File Handling, file last modified date/time, if else, Scanner, String, File, Date, SimpleDateFormat(), exists(), Regular expression, lastModified(), java.io.

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How to get last modified date of given file in Java? How to get last modified date of given file in Java? Reviewed by Rohit Agarwal on 4/26/2017 Rating: 5

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