Rename File in Java

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Renaming a file is a common task in many applications. In this blog post, we'll explore various methods to rename a file in Java and provide outputs for each example to ensure clarity.

1. Using Java's File Class

Java's File class offers a simple way to rename files through its renameTo method:
import java.io.File;

public class Main{
    public static void main(String[] args) {
        File oldFile = new File("oldName.txt");
        File newFile = new File("newName.txt");
    
        if(oldFile.renameTo(newFile)) {
            System.out.println("File renamed successfully!");  // Output: File renamed successfully!
        } else {
            System.out.println("Failed to rename the file.");
        }
    }
}
Make sure to create an oldName.txt file in your file system. Once you run the above program will rename this file to newName.txt.

2. Using Java's NIO Library 

Java's New I/O (NIO) library provides the Files class which offers a more modern approach to file operations, including renaming:
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.io.IOException;

public class Main{
    public static void main(String[] args) {
        Path sourcePath = Paths.get("oldName.txt");
        Path targetPath = Paths.get("newName.txt");
        
        try {
            Files.move(sourcePath, targetPath);
            System.out.println("File renamed successfully!");  // Output: File renamed successfully!
        } catch (IOException e) {
            System.out.println("Failed to rename the file.");
        }
    }
}

3. Using Apache Commons IO 

If you're working with the Apache Commons IO library, you can use the FileUtils class to handle file operations:
import org.apache.commons.io.FileUtils;
import java.io.File;
import java.io.IOException;

public class Main{

    public static void main(String[] args) {
        File oldFile = new File("oldName.txt");
        File newFile = new File("newName.txt");
        
        try {
            FileUtils.moveFile(oldFile, newFile);
            System.out.println("File renamed successfully!");  // Output: File renamed successfully!
        } catch (IOException e) {
            System.out.println("Failed to rename the file.");
        }
    }
}
Note: Ensure you've added the Apache Commons IO library to your project if you choose to use this method. 

Conclusion 

Renaming files in Java can be done in various ways, depending on your project's requirements and the libraries you're using. This guide provides a clear path to understanding and implementing file renaming functionality. Remember to always handle exceptions appropriately and ensure your application gracefully deals with scenarios where renaming might fail due to reasons such as file locks or permission issues.

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