5 Questions
What is the ideal use case for lambda expressions?
When you want to pass functionality as an argument to another method
What is the purpose of the CheckPerson interface?
To create a functional interface that contains one abstract method
What is the purpose of the Predicate<T> interface?
To create a non-functional interface that contains one abstract method
What is the syntax for a lambda expression?
A list of parameters enclosed in parentheses
What is the purpose of generic types?
To specify one or more type parameters within angle brackets
Study Notes
- Lambda expressions enable you to treat functionality as method argument, or code as data.
- The ideal use case for lambda expressions is when you want to pass functionality as an argument to another method, such as what action should be taken when someone clicks a button.
- The approach in the first section, which creates methods that search for members that match one characteristic, is potentially brittle.
- The approach in the second section, which is more generic and allows you to search for members of a specified sex, gender, or age range, is more robust and less brittle.
- The CheckPerson interface is a functional interface that contains only one abstract method.
- This method takes one parameter and returns a boolean value.
- The interface Predicate<T> is an interface that contains the method boolean test(T t): this method takes a T object and returns a boolean value indicating whether the object is equal to a certain value.
- Generic types specify one or more type parameters within angle brackets (<>).
- A parameterized type is a type that contains a method that has the same return type and parameters as a specific type.
- You can use lambda expressions in place of specific method invocations in a method.
- You can use generics more extensively by using aggregate operations that accept lambda expressions as parameters.
- Lambda expressions are similar to methods in that they are anonymous functions that do not have a name.
- Lambda expressions can take multiple parameters.
- The syntax for a lambda expression is a list of parameters enclosed in parentheses.
- The first parameter is the function to be executed, and the second parameter is the input parameter.
- The lambda expression can access the local variables of the enclosing scope.
Test your knowledge of lambda expressions, functional interfaces, and generics with this quiz. Explore the use cases, syntax, and advantages of lambda expressions, as well as the concepts of functional interfaces and generic types.
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