How to rename given file name in Java?

Problem Description :

Write a program in Java that rename's given file name.

Java program that renames given file name.

How to rename the given file name in Java?

Concept :

We need to use the following method of File class that is present in java.io.* package.

public boolean renameTo(File dest) - It returns true if and only if the renaming succeeded otherwise false.

Java Program :

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; } }

Output :

Output - How to rename given file name in Java?

References :

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

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

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Tags : File Handling, renaming file, if else, Scanner, String, File, renameTo(File), exists(), Regular expression, java.io.

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