Not able to pass validation

Question about the task

User, loser, coder and programmer

Java Core, Level 4, Lesson 8

Under discussion

1. Enter a few strings (keys) from the keyboard [in a loop].
The following strings (keys) are allowed: "user", "loser", "coder", "programmer".
Stop reading in strings after reading in any string that does not match one of the above.

2. For each entered string:
2.1. Create the appropriate object [see Person.java], e.g. create a User object for the string "user".
2.2. Pass this object to the doWork method.

3. Write an implementation of the doWork method, which:
3.1. Calls the live() method on the passed object if person is a User.
3.2. Calls the doNothing() method if person is a Loser.
3.3. Calls the writeCode() method if person is a Coder.
3.4. Calls the enjoy() method if person is a Programmer.

Requirements:

The main method must read strings from the keyboard.
The main method should stop reading strings from the keyboard as soon as the entered string does not match one of the allowed strings ("user", "loser", "coder", "programmer").
For each correctly entered string ("user", "loser", "coder", "programmer"), call the doWork method with the appropriate Person object as the argument.
The Solution class must implement a doWork method with one Person parameter.
The doWork method should call the live() method on the passed object if it is a User.
The doWork method should call the doNothing() method on the passed object if it is a Loser.
The doWork method should call the writeCode() method on the passed object if it is a Coder.
The doWork method should call the enjoy() method on the passed object if it is a Programmer.

package com.codegym.task.task14.task1411; import java.io.BufferedReader; import java.io.InputStreamReader; /* User, loser, coder and programmer */ public class Solution implements Person{ public static void main(String[] args) throws Exception { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); Person person = null; String key = null; // Here's the loop for reading the keys. Item 1 Boolean loop = true; while(loop) { key = reader.readLine(); // Create an object. Item 2 switch(key){ case "user": person = new User(); doWork(person); break; case "loser": person = new Loser(); doWork(person); break; case "coder": person = new Coder(); doWork(person); break; case "programmer": person = new Programmer(); doWork(person); break; default: loop = false; break; } //doWork(person); // Call doWork } } public static void doWork(Person person) { // Item 3 //System.out.println(person.getClass().getSimpleName()); switch (person.getClass().getSimpleName()){ case "User": ((User) person).live(); break; case "Loser": ((Loser) person).doNothing(); break; case "Coder": ((Coder) person).writeCode(); break; case "Programmer": ((Programmer) person).enjoy(); break; } } }

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Guadalupe Gagnon

Level 37 , Tampa, United States

15 March 2019, 13:52

Sounds silly, and your output will be the same, but change the doWork method to use if-instanceof -else if statements instead of a switch, for example:

if(person instanceof Person.User)
   ((User) person).live();
else if(...........

leo yorokobi

Level 19 , Bangalore, India

15 March 2019, 18:31

Thanks, Guadalupe . Your Suggestion worked ...

Guadalupe Gagnon

Level 37 , Tampa, United States

15 March 2019, 19:26

You are level 16 so I am sure you have noticed that a lot of these tasks are directions in the requirements. I was pulling my hair out personally from trying to figure out if I was doing something wrong (like a small spelling error), or if the task was testing something that was not in the requirements/conditions. This is a perfect example of this because the conditions say that only the correct method has to be called on the passed in object, not that you had to specifically use the keyword 'instanceof'. Anyways, good luck with the last 4 levels and ask for help if you are stuck!