What Is Class Data Type in Java?


Scott Campbell

What Is Class Data Type in Java?

In Java, the class data type is a fundamental concept that plays a crucial role in object-oriented programming. A class is like a blueprint or template that defines the attributes (data members) and behaviors (methods) of objects.

It serves as a blueprint for creating multiple instances of objects with similar characteristics.

Defining and Declaring Classes

To define a class in Java, you use the class keyword followed by the class name. The convention is to start the class name with an uppercase letter. For example:

class MyClass {
    // class body

To declare a variable of a specific class type, you specify the class name as the data type. For example:

MyClass myObject;

Creating Objects from Classes

Once you have defined a class, you can create objects from it using the new keyword followed by the constructor of the class. The constructor initializes the newly created object and allocates memory for its data members.

MyClass myObject = new MyClass();

Data Members and Methods within Classes

Inside a class, you can define various data members or variables to store information related to objects of that class. These variables can have different access modifiers (public, private, protected) to control their accessibility.

Additionally, classes can also contain methods that define actions or behaviors associated with objects of that particular class. Methods are functions that perform specific tasks when called upon an object.

Inheritance and Class Hierarchy

Java supports inheritance, which allows classes to inherit properties and behaviors from other classes. Inheritance creates a class hierarchy where subclasses can extend the functionality of superclasses.

To create a subclass, you use the extends keyword followed by the name of the superclass. The subclass inherits all accessible members (data members and methods) from its superclass.

class SubClass extends SuperClass {
    // class body


In Java, a class is a blueprint or template that defines the attributes and behaviors of objects. It allows you to create multiple instances of objects with similar characteristics.

By understanding how classes work, you can organize your code effectively and apply object-oriented principles in your Java programs.

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