The QuestionFileOutputStream class must initialize the AmigoOutputStream field in the constructor.

Question about the task

Extending AmigoOutputStream

Java Core, Level 8, Lesson 8

Under discussion

I'm confused as to how you do this task? Any help appreciated

Using the wrapper (decorator) design pattern, extend the functionality of AmigoOutputStream.
In the QuestionFileOutputStream class, the following functionality should be implemented for the close() method:
1. Display "Do you really want to close the stream? Y/N".
2. Read a line.
3. If the read line is "Y", then close the stream.
4. If the read line is not "Y", then don't close the stream.

Requirements:

Don't change AmigoOutputStream.
The QuestionFileOutputStream class must implement the AmigoOutputStream interface.
The QuestionFileOutputStream class must initialize the AmigoOutputStream field in the constructor.
All of QuestionFileOutputStream's methods must be delegated to the AmigoOutputStream object.
The close() method should ask the user, "Do you really want to close the stream? Y/N".
The close() method should close the stream only if it reads the answer "Y" from the console.

package com.codegym.task.task18.task1812; import java.io.IOException; public interface AmigoOutputStream { void flush() throws IOException; void write(int b) throws IOException; void write(byte[] b) throws IOException; void write(byte[] b, int off, int len) throws IOException; void close() throws IOException; }

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Gellert Varga

Level 23 , Szekesfehervar, Hungary

10 July 2021, 22:32

It's not nice of me to give you advice here, because I didn't was bale to solve this task on my own. (Patience was short...) I downloaded the correct solution... 1) "The QuestionFileOutputStream class must initialize the AmigoOutputStream field in the constructor." A) your Question..Stream class must have a private AmigoOutputStream amigoOutputStream field. B) your Question..Stream's constructor must take an object of type AmigoOutputStream. Yes, the AmigoOutputStream is an interface, you can't make an object from it. But we can have such a class for example: BanderasOutputStream implements AmigoOutputStream, and you can have one like this: JenniferOutputStream implements AmigoOutputStream, and you should be able to wrap these objects. If you send such a Banderas or Jennifer object to the Question..Stream constructor, it will be able to receive them, because they are both instanceof AmigoOutputStream. In the constructor the 'this.amigoOutputStream' must be initialized to this sent object. 2) "All of QuestionFileOutputStream's methods must be delegated to the AmigoOutputStream object." It means, for example:

@Override
public void flush() throws IOException {
    amigoOutputStream.flush();
}

and you should do the same with all of the methods.