Java Fundamentals: The Java Reflection API Method Handles

The Reflection API brings class and object introspection to Java, on top of which Spring and Hibernate are built. This course covers object creation, field modification, and method invocation, as well as Method and Var handles for improved performances.
Course info
Rating
(15)
Level
Intermediate
Updated
Jan 18, 2019
Duration
3h 10m
Table of contents
Course Overview
Introducing Java Reflection
Creating an Object Metamodel Using Annotations and Reflection
Creating an Object Relational Mapper Using an Object Metamodel
Injecting Dependencies in an Object Using an Object Metamodel
Improving Performance Using Method Handles
Description
Course info
Rating
(15)
Level
Intermediate
Updated
Jan 18, 2019
Duration
3h 10m
Description

As a Java developer, mastering the reflection API allows you to build powerful frameworks that will bring advanced functionalities to your application. In this course, Java Fundamentals: The Java Reflection API Method Handles, you will learn how you can use reflection API efficiently. This API is very technical, so this course is organized around the study of two real-life use cases: the building of an Object Relational Mapper, on the model of Hibernate, and the creation of a dependency injection framework, on the model of Spring. First, you will understand how to introspect classes and objects and how to discover their structure. Next, you will learn how to build objects without knowing their class at compile time, to set values to their fields and to invoke their methods. Finally, you will understand the performance issues of this API, and be able to use method handles and var handles to fix these issues. By the end of this course, you will be able to master the reflection API that will help you in creating performant and versatile Java applications.

About the author
About the author

Passionate about programming computers for over 20 years, Jose made his debut in assembler and C, C for SIMD parallel machines before adopting Java as an object-oriented language. Assistant professor in Paris North University for more than 15 years, Jose also brings his expertise to many projects, in various industrial fields.

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Section Introduction Transcripts
Section Introduction Transcripts

Course Overview
Hello, my name is Jose. I'm a Java Champion and Java Rockstar. I'm talking to you from Paris, and I'm very excited to present my new course, Java Fundamentals: The Java Reflection API and Method Handles. This course shows you how to discover the structure of classes at runtime without knowing them at compile time. You will learn how to create objects; how to set up their fields, even private fields; how to invoke their methods; how to use annotations to add metadata on class elements; and how to read them at runtime. Method handles are also covered for improved performances. I organized this course around two very important real-life use cases. First, you will create a simple object relational mapper on the model of Hibernate, and second, a spring-like dependency injection framework. Before you move on, be sure to be familiar with all these, the Java language, a little bit of lambdas, and the basics of SQL databases and JDBC. The Reflection API is not an easy topic. It is very technical. And I can't wait to see the awesome tools and applications you will be writing after following this course.