Some of these examples of loops are usable from Java 5, in more recent versions many other new features have been added such as lambdas, streams, methods in interfaces and new API for dates in Java 8, the modularity, improved try-with-resource, jlink or a new publishing model in Java 9, type inference for local variables in Java 10, an HTTP client in Java 11 and other novelties in the Java language and platform. The code was quite verbose and since loops are a basic construction of any programming language it is used many times in any algorithm. One simplistic approach is to create several methods each method searches for members that match one characteristic, such as gender or age.Until Java 5 to make a loop from 0 to N elements you had to use a variable to keep a counter, do a comparison to check if the limit had been reached and increase the variable in the next execution. Find the code excerpts described in this section in the exampleĪpproach 1: Create Methods That Search for Members That Match One Characteristic It improves upon this approach with local and anonymous classes, and then finishes with an efficient and concise approach using lambda expressions. This section begins with a naive approach to this use case. Suppose that the members of your social networking application Suppose that members of this social networking application are 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. The system performs the specified action on all matching members.ġa.The system finds all members that match the specified criteria.Administrator selects the Submit button.Administrator specifies an action to perform on those selected members.Administrator specifies criteria of members on which to perform a certain action.The following table describes this use case in detail: FieldĪdministrator is logged in to the system.Īction is performed only on members that fit the specified criteria. Social networking application that satisfy certain criteria. Want to create a feature that enables an administrator to performĪny kind of action, such as sending a message, on members of the Suppose that you are creating a social networking application. Accessing Local Variables of the Enclosing Scope.
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