Java: Getting Started with Reflection

Java SE 15    |    Intermediate
  • 14 videos | 1h 55m 46s
  • Includes Assessment
  • Earns a Badge
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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.

WHAT YOU WILL LEARN

  • discover the key concepts covered in this course
    create and set up a basic IntelliJ project to write java code
    define new classes and instantiate objects of these classes
    use class handles accessed via reflection to explore properties of classes
    view fields, methods, and their modifiers using reflection
    examine how you can identify classes from their objects
    use reflection to identify a variety of classes from objects
  • get fully qualified names and simple names of classes using their handles
    investigate how you can get a handle to class objects using just the class name
    use reflection to identify the modifiers of class members
    identify anonymous, local, member classes, and interfaces using reflection
    identify enums, arrays, and primitives using reflection
    access package information, superclass, and declaring class information
    summarize the key concepts covered in this course

IN THIS COURSE

  • Playable
    1.  Course Overview
    2m 19s
    In this video, you’ll learn more about this course and your instructor. In this video, you’ll learn how to access a Java object that represents the class of a Java object. You’ll then move on to the use of Reflection APIs… FREE ACCESS
  • Playable
    2.  Creating an IntelliJ Project
    6m 51s
    Here, you’ll watch a demo. You’ll explore the use of reflection in Java. You’ll start at a terminal prompt on a Unix-based system. Then, you’ll switch over from a terminal prompt to IntelliJ. IntelliJ is an extremely… FREE ACCESS
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    3.  Creating Classes and Instantiating Objects
    7m 1s
    Here, you’ll watch a demo. You’ll begin by writing some code. You’ll see this is in the Employee.java class. Then, you’ll edit this class. You’ll start with an import statement. You’ll need to import java.util.Random.… FREE ACCESS
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    4.  Extracting Class Information from Objects
    10m 35s
    Here, you’ll watch a demo. You’ll perform some simple operations using Reflection. You already have a class called Employee. You’ve instantiated that class and examined the two objects of the class you created. You’ll… FREE ACCESS
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    5.  Viewing Class Fields, Methods, and Their Modifiers
    10m 53s
    Here, you’ll watch a demo. Here, you’ll move to reflection and make use of code to find the various methods, properties, and constructors that a particular object supports. You’ll clear most of the code you’ve already… FREE ACCESS
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    6.  Examining Class Objects for Different Data Types
    9m 43s
    Here, you’ll watch a demo. You’ll continue to explore the Reflection APIs in Java. The starting point for the use of Reflection is getting a handle on the class a particular object belongs to. That class is itself an… FREE ACCESS
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    7.  Identifying Classes Using Objects
    11m 42s
    Here, you’ll watch a demo. As you’ve learned, every object knows its class. You had variables which were of type list and list is an interface in Java. You’ll explore how different types of objects in Java know their… FREE ACCESS
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    8.  Viewing Fully Qualified Class Names
    8m 37s
    Here, you’ll watch a demo. You’ll continue with the theme of accessing the class of an object. You’ll turn your focus to user-defined classes. First, you’ll clear the contents of your current main class and open up… FREE ACCESS
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    9.  Creating Class Handles from Class Names
    9m 11s
    Here, you’ll watch a demo. You’ll see how to get a handle on a class from the name of the class in the form of a string. This is an important bit of functionality. You’ll use it to make runtime decisions about which… FREE ACCESS
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    10.  Viewing Modifiers of Class Members
    8m 8s
    Here, you’ll watch a demo. You’ll pick up from where you left off in the last demo. You’ll continue with reflection operations. You’ll see how to query all of the properties of a class object. For instance, its modifiers,… FREE ACCESS
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    11.  Anonymous, Local, Member Classes, and Interfaces
    11m 40s
    Here, you’ll watch a demo. You’ll learn about other kinds of metadata that you might want to query. For instance, you’ll learn about type parameters, whether a class is an anonymous or an inner class, and so on. First,… FREE ACCESS
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    12.  Identifying Enums, Arrays, and Primitives
    4m 34s
    Here, you’ll watch a demo. In this demo, you’ll continue exploring metadata. You’ll start with enumerated types also known as enums. First, you’ll clear the contents of your Main method and then introduce our enum… FREE ACCESS
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    13.  Viewing Class Package, Superclass, Declaring Class
    11m 57s
    Here, you’ll watch a demo. You’ll turn your attention to type parameters and package information. You’ll clear the code. Then, you’ll reintroduce your private static final class HR. This extends Department. Department is… FREE ACCESS
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    14.  Course Summary
    2m 35s
    In this video, you’ll summarize what you’ve learned in this course. You’ve learned how to access a Java object that represents the class of that Java object using the .getClass method. You explored the use of various… FREE ACCESS

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