I don't have a clue how to do it

Question about the task

Under discussion

Can anybody help?

The Gigantic Turnip:
1. Make the Person class implement the TurnipItem interface.
2. Implement the pull(Person person) method in the Person class so that it displays a phrase like '<name> behind <person>'.

Example:
Grandma behind Grandpa Grandpa behind Turnip

3. Fix the bug in the logic of the loop in the TurnipStory class's tell method.
4. Run the main method and enjoy the story!

Requirements:

The Person class must implement the TurnipItem interface.
The Person class must have a pull method with one Person parameter.
The Person class's pull method must display a phrase like '<name> behind <person>'. For example: Grandma behind Grandpa.
The main method should display a condensed version of The Gigantic Turnip on the screen.

package com.codegym.task.task13.task1327; import java.util.ArrayList; import java.util.List; /* Turnip */ public class Solution { public static void main(String[] args) { List<Person> plot = new ArrayList<>(); plot.add(new Person("Turnip")); plot.add(new Person("Grandpa")); plot.add(new Person("Grandma")); plot.add(new Person("Granddaughter")); TurnipStory.tell(plot); } }

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Brandon Waites

Level 26 , Cincinnati, United States

5 February 2023, 12:01

I will expand on Johannes' answer in a bit more detail. Think about the relationship between the List<Person> plot in the solution and the for loop within the TurnipStory class. When you added elements to the list, you did so as

plot.add(new Person("Turnip"));
plot.add(new Person("Grandpa"));
plot.add(new Person("Grandma"));
plot.add(new Person("Granddaughter"));

This means the first item in the list (index of 0) is the Person item with the name of Turnip. The next item you added was Grandpa (index 1), then Grandma (2), then Granddaughter(3). So you have 4 total items in the list, and the highest index for this list is 3. Moving to your TurnipStory class, the most important (and identifiably problematic) code lies here:

for (int i = 0; i < items.size() - 1; i++) {
    first = items.get(i);
    second = items.get(i+1);

If we were to run the code, the for loop would start with the elements at the beginning of the list (first = items.get(0) and second = items.get(1) ), which would output the following:

Grandpa behind Turnip
Grandma behind Grandpa
Granddaughter behind Grandma

While this logic is true, the task specifically asks us to have the system print the lines in reverse, as such:

Granddaughter behind Grandma
Grandma behind Grandpa
Grandpa behind Turnip

Which means that we would want to start at the end of the list, and work our way back to the beginning. So your code functions without issue, it's just that for the task specifically, you need to figure out a way to reverse the order of the printed lines (i.e., access the last items in the list before the first). Hope that helps.

Rich

Level 23 , San Diego, United States

30 September 2020, 03:07

if you are on a smartphone there are arrow buttons in the top right of the screen. these toggle between your classes

Johannes

Level 27 , Centurion, Pretoria, South-Africa

16 April 2020, 07:55

I had to google the story (old Russian folk tale) to get the sequence. Know the feeling with this question, LOL. You must display it from the back to the front. i.e. for (int i = items.size()-1; i > 0; i--) { first = items.get(i); second = items.get(i-1); first.pull(second); }

Jonas

Level 41 , Vilnius, Lithuania

16 April 2020, 07:34

I think that in Person class pull method you should output name first and only then second name, so it should look like: public void pull(Person second) { System.out.println(name+ " behind " + second.getName() ); } instead of: public void pull(Person second) { System.out.println(second.getName()+ " behind " + name ); }