What are the types of classes in java

There are four main types of classes in Java: ordinary classes, abstract classes, interfaces and enumeration types. Ordinary classes are used to create custom objects, abstract classes contain abstract methods, interfaces define method signatures, and enumerated types represent a set of fixed values.

Types of classes in Java

Classes in Java are mainly divided into the following four types:

1. Common class

• The most common class type, used to create custom objects.
• You can define data members (fields) and methods.
• Create objects by using the new operator.

2. Abstract class

• A class that cannot be instantiated and only contains abstract methods.
• Aims to be inherited by subclasses, which provide the implementation of abstract methods.

3. Interface

• is the definition of an abstract type, containing only abstract methods and no data members.
• is used to define a set of method signatures, which must be implemented by the class that implements it.
• Multiple inheritance can be achieved by implementing multiple interfaces.

4. The enumeration type

• represents a fixed and limited set of values, which are defined through enumeration constants.
• Provides type safety and mandatory checking.
• Commonly used to express status, options or permissions.

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