Не пойму в чём дело.
package com.javarush.task.task18.task1814;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
/*
UnsupportedFileName
*/
public class TxtInputStream extends FileInputStream {
public TxtInputStream(String fileName) throws IOException, UnsupportedFileNameException {
super(fileName);
if (!fileName.matches("^+\\.txt$")) {
super.close();
throw new UnsupportedFileNameException();
} else {
return;
}
}
public static void main(String[] args) {
}
}