Advance Programming In Java | 7. Annotations and Reflection API by Abraham | Learn Smarter
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7. Annotations and Reflection API

Annotations and the Reflection API are pivotal features in Java that enhance the flexibility and dynamic capabilities of applications. Annotations serve as metadata, providing developers the ability to add information to code elements that can be utilized by compilers or through reflection at runtime. The Reflection API allows for runtime inspection and manipulation of classes, methods, and fields, making it ideal for various tasks like serialization and dynamic processing.

Sections

  • 7

    Annotations And Reflection Api

    This section covers Java annotations and the Reflection API, highlighting their use and significance in enhancing Java's flexibility and dynamic capability.

    Learning Practice

  • 7.1

    Annotations In Java

    Annotations in Java are metadata that provide information about program elements, influencing code behavior without altering its execution.

    Learning Practice

  • 7.1.1

    What Are Annotations?

    Annotations are a form of metadata in Java that provide information about the code without affecting its execution.

    Learning Practice

  • 7.1.2

    Syntax Of Annotations

    This section provides an overview of the syntax for defining annotations in Java, along with examples and explanations of built-in annotations.

    Learning Practice

  • 7.1.3

    Built-In Java Annotations

    This section covers the built-in annotations in Java, describing their uses and significance.

    Learning Practice

  • 7.1.4

    Meta-Annotations

    Meta-annotations are annotations that apply to other annotations, providing additional information and control over how those annotations are processed.

    Learning Practice

  • 7.1.5

    Custom Annotations

    This section explains how to create and use custom annotations in Java, highlighting their syntax and application.

    Learning Practice

  • 7.2

    Reflection Api

    The Reflection API in Java allows runtime inspection and manipulation of classes, methods, and fields while maintaining access to private elements.

    Learning Practice

  • 7.2.1

    What Is Reflection?

    Reflection in Java allows for runtime inspection and manipulation of classes, methods, and fields, enhancing flexibility and dynamism in programming.

    Learning Practice

  • 7.2.2

    Key Classes In Java.lang.reflect

    The section covers the essential classes in the Reflection API of Java and their functionalities.

    Learning Practice

  • 7.2.3

    Obtaining Class Object

    This section explains various methods to obtain a Class object in Java, which enables dynamic inspection and manipulation of classes at runtime.

    Learning Practice

  • 7.2.4

    Using Reflection To Inspect A Class

    This section discusses the use of Java's Reflection API to inspect classes, methods, and fields at runtime.

    Learning Practice

  • 7.2.5

    Creating Objects Using Reflection

    This section explains how to create objects in Java using the Reflection API, detailing the necessary steps and methods involved.

    Learning Practice

  • 7.2.6

    Accessing Private Members

    This section explains how to use Java's Reflection API to access private members of a class.

    Learning Practice

  • 7.2.7

    Reflection + Annotations: A Powerful Combo

    Reflection and annotations in Java allow for flexible metadata processing and dynamic manipulation of code.

    Learning Practice

  • 7.2.8

    Use Cases Of Annotations And Reflection

    This section discusses the practical applications of Annotations and the Reflection API in Java, highlighting their importance in framework development, code generation, and testing.

    Learning Practice

  • 7.2.9

    Limitations And Considerations

    This section discusses the main limitations and considerations when using Java's Reflection API.

    Learning Practice

References

AJP ch7.pdf

Class Notes

Memorization

What we have learnt

  • Annotations provide metadat...
  • The Reflection API allows f...
  • Both features are widely us...

Final Test

Revision Tests