How to rename given file name in Java?

Problem Description :

Write a program in Java that rename's 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;
	}
	}

view raw RenameFile.java hosted with ❤ by GitHub

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

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

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