JDK8 Lambda expressions demo
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This document provides an overview of lambda functions in Java, including their syntax, functional interfaces, type checking, local variables and closures, and method references. Lambda functions allow implementing functional interfaces concisely and can be passed around as arguments. They are anonymous and support multiple argument types. Common functional interfaces in Java 8 include Runnable and Callable. Method references provide an even more concise way to refer to existing methods rather than defining anonymous functions.
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100% human made.
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JDK8 Lambda expressions demo
- 2. Outline Behavior parameterization ? Lambda in nutshell Function Interface Type Checking Local variables and Closure Method reference
- 4. Lambda in nutshell Anonymous Passed around Concise
- 5. Syntax No Arguments One Argument Multiple Arguments With Explicit argument types Multiple Statements
- 6. Function Interface It’s an interface with exactly one abstract method. Example: Runnable, Callable, Comparator. A functional interface can have multiple default methods Functional descriptor
- 7. Common Functional Interfaces in JDK8
- 8. Type Checking new OptSumOfNumbers().findSum(i -> true, numbers); findSum(Predicate<Integer> predicate, List<Integer> numbers) What is the functional descriptor for predicate ? Functional descriptor Integer -> boolean matches lambda expression. Target Type: Predicate<Integer> Integer -> boolean
- 9. Restrictions on local variables & Closure Demo
- 10. Method reference Lambda Method Reference Equivalent (TripModel trip) -> trip.getTripId() TripModel::getTripId (String s) -> System.out.println(s) System.out::println (str, i) -> str.substring(i) String::substring () -> Thread.currentThread().dumpStack() Thread.currentThread()::dumpStack
- 11. Method reference A method reference to a static method. A method reference to an instance method of an object of a particular type. A method reference to an instance method of an existing object. A method reference to a constructor.
Editor's Notes
- #7: Signature of the abstract method is very important since we use it describe the signature of Lambda expression. We can this abstract method as function descriptor.