What is the output(substring and file extension name)? : Questions « Utility Classes « SCJP

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import java.io.File;

public class MainClass {
  public static void main(String[] argv) throws Exception {
    String TheFile = "Program.java";
    File F = new File(setFileType(TheFile));
    System.out.println("Created " + TheFile);

  }

  public static String setFileType(String fname) {
    int p = fname.indexOf('.');
    if (p > 0)
      fname = fname.substring(0, p);
    fname += ".TXT";
    return fname;
  }

}