Java Code for File Extension

Code for File Extension

The Java code here asks the user to enter a valid file name, and then remove the file name but keep the extension of it. So the user enters a file name and gets the extension of it.

The Java Code is provided below:-

///////////////////////////////////
package developer;

import java.util.Scanner;

public class FileExtension {

/**
* @param args
*/
public static void main(String[] args) {

String fileExt = null;

System.out.println("Enter a valid file name whose extension is desired:");

Scanner scan = new Scanner(System.in);

if(scan.hasNext())
{
fileExt = getFileExtension(scan.next());
}

if(null != fileExt)
{
System.out.println("The extension of the file is: "+fileExt);
}
else
{
System.out.println("Not a valid file name");
}

}

//get the file extension of the file entered
public static String getFileExtension(String filePath)
{
String extension = null;
if(null != filePath && filePath.contains("."))
{
extension = filePath.substring(filePath.lastIndexOf("."), filePath.length()); 
}
return extension; 
}

}

////////////////////////////////////////

When this code is executed, the output is something like as given below:-

//////////////////////////////////////////
Output

Enter a valid file name whose extension is desired:
javadeveloper.java
The extension of the file is: .java
/////////////////////////////////////////