Course: Reflection in Java
duration: 9 hours |
Language: English (US) |
access duration: 90 days |
Incompany available
Details
Reflection is a popular programming technique that accesses and modifies class and object information at runtime. Reflection is available in many programming languages, but Java has an especially powerful set of reflection APIs that reflect the emphasis that Java lays on type safety. How to implementing this into your daily tasks, is what you will learn during this course. You'll learn to use reflection to access and work with all class members, whether they are fields, constructors, or methods. Next, you’ll learn to harness the power of reflection to add new functionality to your code and work with generics and arrays. Finally, you’ll discover how to use reflection to create dynamic proxies and build harnesses for unit test frameworks.
Result
After completing this course, you'll be able to use reflection in your Java operations with confidence.
Prerequisites
Basic knowledge about programming is a plus.
Target audience
Software Developer, Web Developer
Content
Reflection in Java
Java: Getting Started with Reflection
- Reflection is a popular programming technique that accesses and modifies class and object information at runtime. Reflection is available in many programming languages, but Java has an especially powerful set of reflection APIs that reflect - no pun intended - the emphasis that Java lays on type safety.
- Learn how to access a Java class object. Use reflection APIs to view class fields, constructors, and methods. Create objects for various built-in classes and use reflection to view the class of an object.
- Investigate the significance of the fully qualified name of a class and how you can use the .forName() method from the built-in class java.lang.Class. Use this method to obtain variables of primitive types and arrays of differing dimensionality. Then use reflection to access modifiers applied to member fields.
- Upon completion, you'll be able to use reflection in your Java operations with confidence.
Java: Accessing Constructors, Methods, & Fields Using Reflection
- Reflective access allows a whole range of operations on objects that may not be permitted when you construct and use objects in the regular manner. This is extremely useful while building frameworks that may need access to the internals of your object.
- Use this course to extract information and metadata about the constructors in a class and use them, accessed via reflection, to instantiate objects.
- Access and modify fields or the member variables in an object. Access and invoke the methods defined on a class. Invoke static methods on the class itself and instance methods on specific objects of a class.
- When you're done, you'll have the ability to use reflection to access and work with all class members, whether they are fields, constructors, or methods.
Java: Working with Annotations, Generics, & Arrays Using Reflection
- Annotations on Java code allow you to associate additional metadata with classes, member variables, constructors, and methods. These annotations can be used to perform additional checks or add functionality to your Java code.
- Use this course to practice using annotations with reflection. Work with both built-in and custom annotations and see how you can access the annotations applied on classes, fields, and methods.
- Learn why not all annotations can be accessed via reflection. Create your own custom annotation and experiment with various retention policies. Next, examine accessing generics and arrays with reflection.
- When you're finished, you'll be able to harness the power of reflection to add new functionality to your code and work with generics and arrays.
Java: Leveraging Reflection to Build Dynamic Proxies & Unit Tests
- Reflection in Java is commonly used to create and use dynamic proxies, which allow you to create objects that implement one or more interfaces at runtime. Reflection is also used to build harnesses for unit testing frameworks to invoke set up and tear down methods and run tests. Use this course to get to grips with these use cases.
- Work with and learn why dynamic proxies are incredibly powerful. Investigate what happens to methods you invoke on an instance of a dynamic proxy class. Then create a unit-testing framework harness similar to the JUnit framework in Java.
- Use annotations to identify methods and mark tests to run before using reflection to identify them and run them in the correct sequence.
- When you're finished, you'll have the ability to use reflection to create dynamic proxies and build harnesses for unit test frameworks.
Course options
We offer several optional training products to enhance your learning experience. If you are planning to use our training course in preperation for an official exam then whe highly recommend using these optional training products to ensure an optimal learning experience. Sometimes there is only a practice exam or/and practice lab available.
Optional practice exam (trial exam)
To supplement this training course you may add a special practice exam. This practice exam comprises a number of trial exams which are very similar to the real exam, both in terms of form and content. This is the ultimate way to test whether you are ready for the exam.
Optional practice lab
To supplement this training course you may add a special practice lab. You perform the tasks on real hardware and/or software applicable to your Lab. The labs are fully hosted in our cloud. The only thing you need to use our practice labs is a web browser. In the LiveLab environment you will find exercises which you can start immediately. The lab enviromentconsist of complete networks containing for example, clients, servers,etc. This is the ultimate way to gain extensive hands-on experience.
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