Types of Java Classes
Types of Java Classes ?
There are different types of java classes which are listed below, these all classes are explained in further tutorials...
| Class Name | Definition | Where It Is Mostly Used? | Usage Frequency |
|---|---|---|---|
| Concrete Class | A regular class that can be instantiated and contains complete implementations of methods. | General Java applications and OOP-based programs. | Mostly Used |
| Abstract Class | A class that cannot be instantiated and may have abstract (unimplemented) methods. | Used in inheritance and polymorphism for defining base behaviors. | Mostly Used |
| Final Class | A class that cannot be extended (inherited) by any other class. | Used for security and immutability (e.g., String class in Java). | Mostly Used |
| Inner Class (Nested Class) | A class defined inside another class for better encapsulation. | Used when a class is closely associated with another class. | Not Much Used |
| Anonymous Inner Class | A class without a name, used for quick implementation. | Common in event handling, multi-threading, and callbacks. | Mostly Used |
| Static Class (Nested Static Class) | A static inner class that does not require an instance of the outer class. | Used for utility or helper methods inside outer classes. | Not Much Used |
| POJO Class | A simple Java class with fields, getters, setters, and no business logic. | Used in enterprise applications, data models, and APIs. | Mostly Used |
| Bean Class | A special POJO with a default constructor, private fields, and public getters/setters. | Used in Java frameworks like Spring and JSP. | Mostly Used |
| Singleton Class | A class that allows only one instance throughout the program. | Used in design patterns, logging, database connections, and configuration management. | Mostly Used |
| Utility Class | A class that contains only static methods and is not meant to be instantiated. | Used for helper functions and utility operations. | Mostly Used |
| Service Class | A class that contains business logic, commonly used in frameworks like Spring. | Used in enterprise applications and service layers. | Mostly Used |
| Entity Class | A class that represents a database table, used in ORM frameworks like Hibernate. | Used in database interactions and ORM (e.g., Hibernate, JPA). | Mostly Used |
| Record Class (Java 14+) | A special class type designed for immutable data storage with minimal code. | Used in modern applications where immutable data structures are needed. | Gaining Popularity |
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