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.Approach 9: Use Aggregate Operations That Accept Lambda Expressions as Parameters.Approach 8: Use Generics More Extensively.Approach 7: Use Lambda Expressions Throughout Your Application.Approach 6: Use Standard Functional Interfaces with Lambda Expressions.Approach 5: Specify Search Criteria Code with a Lambda Expression.Approach 4: Specify Search Criteria Code in an Anonymous Class.Approach 3: Specify Search Criteria Code in a Local Class.Approach 2: Create More Generalized Search Methods.

Approach 1: Create Methods That Search for Members That Match One Characteristic.

This section covers the following topics:

Lambda expressions let you express instances of With only one method, even an anonymous class seems a bitĮxcessive and cumbersome. Lambda expressions enable you to do this, to treat functionality as method argument, or code as data.Īnonymous Classes, shows you how to implement a base class without giving it a name.Īlthough this is often more concise than a named class, for classes In these cases, you're usually trying to pass functionality as an argument to another method, such as what action should be taken when someone clicks a button.

One issue with anonymous classes is that if the implementation of your anonymous class is very simple, such as an interface that contains only one method, then the syntax of anonymous classes may seem unwieldy and unclear.

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