Write a Java Program to Get the File Extension

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import java.io.File;

class Main {

  public static void main(String[] args) {
    File file = new File("Test.java");

    // convert the file name into string
    String fileName = file.toString();

    int index = fileName.lastIndexOf('.');
    if(index > 0) {
      String extension = fileName.substring(index + 1);
      System.out.println("File extension is " + extension);
    }
  }
}