Doesn't pass no matter what

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After tons of attempts and on the edge of desperation I decided to use the answer provided by CodeGym. First of all, my answer is literally the same as theirs But this is not everything, it doesn't even pass the provided answer. How is that even possible ? Please let me know what you think.

The first strategy is ready. It's time to test it. To do this:
6.1. Create a Solution class if you haven't already done so.
6.2. Add implementations of the static helper methods to the Solution class:
6.2.1. Set<Long> getIds(Shortener shortener, Set<String> strings). This method should return a set of identifiers for a passed set of strings. You need to use shortner to get the identifier for each individual string.
6.2.2. Set<String> getStrings(Shortener shortener, Set<Long> keys). The method will return the set of strings that matches the passed set of identifiers.
Of course, when you use Shortener for its actual purposes, you probably won't have to get a set of identifiers from a set of strings, nor vice versa. This task is only necessary for testing.
6.2.3. testStrategy(StorageStrategy strategy, long elementsNumber). The method will test the passed strategy on a specific number of elements (elementsNumber). The implementation should:
6.2.3.1. Display the name of the class strategy. The name must not include the package name.
6.2.3.2. Generate a test set using Helper and the specified number of elements (elementsNumber).
6.2.3.3. Create a Shortener object using the passed strategy.
6.2.3.4. Measure and display the time required to run the getIds method for the given strategy and the given set of elements. Display time in milliseconds. When measuring the method's execution time, you can ignore the processor switching to other threads, as well as the time spent on the call itself, returning values, and calling methods to get the time (date). Measure time using Date objects.
6.2.3.5. Measure and display the time required to run the getStrings method for a given strategy and the set of identifiers obtained in the previous clause.
6.2.3.6. Check whether the contents of the set of generated strings and the set returned by getStrings method are the same. If the sets are the same, then display "The test passed.". Otherwise, display "The test failed.".
6.2.4. Add a main() method. Inside the method, test the HashMapStorageStrategy strategy on 10,000 items.
6.3. Verify that the program works and the test is passed.

Requirements:

The getIds method must return the set of identifiers for the passed set of strings.
The getStrings method must return the set of strings for the passed set of identifiers.
The testStrategy method should display the name of the strategy class.
The testStrategy method should generate a test set of strings using the Helper class's generateRandomString method (the number of elements must be equal to the elementsNumber parameter).
The testStrategy method must create a Shortener object using the passed strategy.
The testStrategy method should use Date objects to measure the execution time of the getIds and getStrings methods.
The testStrategy method should compare the number of generated strings and the strings in the set obtained from the getStrings method, and display the result of the test.
The main method must call the testStrategy method.

package com.codegym.task.task33.task3310; import com.codegym.task.task33.task3310.strategy.HashMapStorageStrategy; import com.codegym.task.task33.task3310.strategy.StorageStrategy; import java.util.Date; import java.util.HashSet; import java.util.Set; public class Solution { public static void main(String[] args) { long num = 10000; testStrategy(new HashMapStorageStrategy(), num); } public static Set<Long> getIds(Shortener shortener, Set<String> strings) { Set<Long> keys = new HashSet<>(); for (String s : strings) { keys.add(shortener.getId(s)); } return keys; } public static Set<String> getStrings(Shortener shortener, Set<Long> keys){ Set<String> result = new HashSet<>(); for (Long key: keys) { result.add(shortener.getString(key)); } return result; } public static void testStrategy(StorageStrategy strategy, long elementsNumber){ Helper.printMessage(strategy.getClass().getSimpleName()); Set<String> testSet = new HashSet<>(); for (int i = 0; i <elementsNumber ; i++) { testSet.add(Helper.generateRandomString()); } Shortener shortener = new Shortener(strategy); Date start = new Date(); Set<Long> testIds = getIds(shortener, testSet); Date end = new Date(); long time = end.getTime() - start.getTime(); Helper.printMessage("Time IDs : " + time); start = new Date(); Set<String> strings2 = getStrings(shortener, testIds); end = new Date(); time = end.getTime() - start.getTime(); Helper.printMessage("Time strings : " + time); if(testSet.equals(strings2)) Helper.printMessage("The test passed."); else Helper.printMessage("The test failed."); Helper.printMessage(""); } }

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Guadalupe Gagnon

Level 37 , Tampa, United States

13 April 2021, 13:17

solution

line 19 of the Shortener class is incorrect. It should be adding lastId and String; not lastId twice.

Level 41 , Sofia, Bulgaria

13 April 2021, 13:31

Thanks, it passed. But how did it pass the previous task? I guess bug in the script for verification.

Guadalupe Gagnon

Level 37 , Tampa, United States

13 April 2021, 13:38

useful

probably. I wouldn't know but I have also been stuck on some of these big tasks for bugs that are in completely different areas than the current task. It can be very frustrating.... but I have learned to look at everything when I get a mystery fail.