I've got a bit of a problem here

Question about the task

Resolved

I know the task will not pass due to missing Date objects. Although I thought it will meet at least most of the requirements but it doesn't, even a single one. Anyone can tell me what's wrong? And how did you use

Date class

to measure the time? Because obviously

System.currentMillis();

would be easier..

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 java.math.BigInteger; import java.security.SecureRandom; public class Helper { public static String generateRandomString() { return new BigInteger(130, new SecureRandom()).toString(36); } public static void printMessage(String message){ System.out.println(message); } }

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AnnemiekFF

Level 41 , Breda, Netherlands

30 April 2020, 14:58

solution

The methods have to be static.

Kamil

Level 31 , Near Warsaw, Poland

6 May 2020, 12:27

Problem with modifiers happens to me really often haha. Thank you, mate!