Skip to content

Instantly share code, notes, and snippets.

@javamultiplex
Created September 25, 2017 13:32
Show Gist options
  • Save javamultiplex/35e1c0ed972366120a31f8ee5aba7133 to your computer and use it in GitHub Desktop.
Save javamultiplex/35e1c0ed972366120a31f8ee5aba7133 to your computer and use it in GitHub Desktop.
How to rename given file name in Java?
package com.javamultiplex.filehandling;
import java.io.File;
import java.util.Scanner;
/**
*
* @author Rohit Agarwal
* @category File Handling
* @problem How to rename given file in Java?
*/
public class RenameFile {
public static void main(String[] args) {
Scanner input = null;
try {
input = new Scanner(System.in);
System.out.println("Enter old file name with extension : ");
String oldFileName = input.nextLine();
if (isValidFileName(oldFileName)) {
// File is present in current working directory.
File oldFile = new File(oldFileName);
if (oldFile.exists()) {
System.out.println("Enter new file name with extension : ");
String newFileName = input.nextLine();
if (isValidFileName(newFileName)) {
File newFile = new File(newFileName);
oldFile.renameTo(newFile);
System.out.println("File renamed successfully.");
}
} else {
System.out.println("Old File doesn't exist in current directory.");
}
} else {
System.out.println("Old file name is not valid.");
}
} finally {
if (input != null) {
input.close();
}
}
}
private static boolean isValidFileName(String fileName) {
// Regular expression for validating file names.
String pattern = "^.+\\..+$";
boolean result = false;
if (fileName.matches(pattern)) {
result = true;
}
return result;
}
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment