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Administrator is logged in to the system. Postconditions Action is performed only on members that fit the specified criteria. Main Success Scenario Administrator specifies criteria of members on which to perform a certain action.
Administrator specifies an action to perform on those selected members. Administrator selects the Submit button. The system finds all members that match the specified criteria.
The system performs the specified action on all matching members. Administrator has an option to preview those members who match the specified criteria before he or she specifies the action to be performed or before selecting the Submit button.
Frequency of Occurrence Many times during the day. Suppose that members of this social networking application are represented by the following Person class: This section begins with a naive approach to this use case.
It improves upon this approach with local and anonymous classes, and then finishes with an efficient and concise approach using lambda expressions. Find the code excerpts described in this section in the example RosterTest.
One simplistic approach is to create several methods; each method searches for members that match one characteristic, such as gender or age. The following method prints members that are older than a specified age: A List is an ordered Collection.
A collection is an object that groups multiple elements into a single unit. Collections are used to store, retrieve, manipulate, and communicate aggregate data. For more information about collections, see the Collections trail.
This approach can potentially make your application brittle, which is the likelihood of an application not working because of the introduction of updates such as newer data types. Suppose that you upgrade your application and change the structure of the Person class such that it contains different member variables; perhaps the class records and measures ages with a different data type or algorithm.
You would have to rewrite a lot of your API to accommodate this change. In addition, this approach is unnecessarily restrictive; what if you wanted to print members younger than a certain age, for example?
Create More Generalized Search Methods The following method is more generic than printPersonsOlderThan; it prints members within a specified range of ages: What if you decide to change the Person class and add other attributes such as relationship status or geographical location?
Although this method is more generic than printPersonsOlderThan, trying to create a separate method for each possible search query can still lead to brittle code. You can instead separate the code that specifies the criteria for which you want to search in a different class.
The following method prints members that match search criteria that you specify: If the method tester. To specify the search criteria, you implement the CheckPerson interface: This method filters members that are eligible for Selective Service in the United States: Because CheckPersonEligibleForSelectiveService implements an interface, you can use an anonymous class instead of a local class and bypass the need to declare a new class for each search.
Specify Search Criteria Code in an Anonymous Class One of the arguments of the following invocation of the method printPersons is an anonymous class that filters members that are eligible for Selective Service in the United States: However, the syntax of anonymous classes is bulky considering that the CheckPerson interface contains only one method.
In this case, you can use a lambda expression instead of an anonymous class, as described in the next section.Host a Custom Skill as an AWS Lambda Function.
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