What is The Error

Question about the task

UnsupportedFileName

Java Core, Level 8, Lesson 8

Resolved

Please Help..

Change the TxtInputStream class so that it only works with txt files (* .txt).
For example, first.txt or name.1.part3.txt.
If a non-txt file is passed (e.g. file.txt.exe), then the constructor should throw
an UnsupportedFileNameException.
Think about what else you need to do if an exception is thrown.

Requirements:

The TxtInputStream class must inherit the FileInputStream class.
If a txt file is passed to the constructor, TxtInputStream should behave like a regular FileInputStream.
If a non-txt file is passed to the constructor, an UnsupportedFileNameException should be thrown.
If an exception is thrown, then you must also call super.close().

package com.codegym.task.task18.task1814; import java.io.*; /* UnsupportedFileName */ public class TxtInputStream extends FileInputStream { private final String fileName; public TxtInputStream(String fileName) throws IOException, UnsupportedFileNameException { this.fileName = fileName; if(fileName.substring(fileName.length()).contains(".txt")) new FileInputStream(fileName); else{ throw new UnsupportedFileNameException(); super.close(); } } public static void main(String[] args) { } }

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Naina Gupta

Level 20 , Kulu, India

23 May 2019, 19:22

solution

The file name should end with .txt whereas your condition checks if the file name contains .txt or not. You could use the endsWith function here