Get file extension name : Files « File Input Output « Java

1. Java
2. File Input Output
3. Files

Get file extension name

   

import java.io.File;

public class Main {
  public static void main(String[] argv) {
    getFileExtensionName(new File("a.txt"));
  }

  public static String getFileExtensionName(File f) {
    if (f.getName().indexOf(".") == -1) {
      return "";
    } else {
      return f.getName().substring(f.getName().length() - 3, f.getName().length());
    }
  }
}

   
    
    
  

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