Java Generics Tutorial: Defining a Generics Class | Generics in Java | Java Tutorial

Welcome to our Java tutorial series! In this video, we'll explore the fundamentals of defining a Generics class in Java, providing you with a step-by-step guide on how to create and use generic classes effectively.

Generics in Java allow you to create classes, interfaces, and methods that operate on different types while providing compile-time type safety. Defining a Generics class enables you to write reusable and type-safe code that can work with various data types seamlessly.

In this tutorial, we'll cover:

1. An introduction to Generics in Java and their importance in modern programming.
2. Explanation of how to define a Generics class using angle brackets and type parameters.
3. Demonstrations of creating generic classes for different data types, such as Integer, String, or custom objects.
4. How to instantiate and use instances of a generic class with different types.
5. Best practices and common patterns for defining and using generic classes in Java.

By the end of this video, you'll have a solid understanding of how to define and utilize Generics classes in Java to write more flexible and reusable code.

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How to define a Generics class? | Generics in Java | Java Tutorial

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People coming from other languages may not know that you can only specify reference types for generic classes, no primitives, no char, no byte, no int, no float, no long, no double, no boolean. In the future when Project Valhalla gets to Java that may no longer be true at that time. For now, no primitive types can be used with generics!

jshell> MyClass<float> mcf = new MyClass<float>(100.00f);
| Error:
| unexpected type
| required: reference
| found: float
| MyClass<float> mcf = new MyClass<float>(100.00f);
| ^---^
| Error:
| unexpected type
| required: reference
| found: float
| MyClass<float> mcf = new MyClass<float>(100.00f);
| ^---^