Class Attributes in Java

Class attributes in Java are variables that belong to a class and represent the properties or characteristics of objects created from that class.

In Java, class attributes are also known as fields or member variables. They store the data of an object and define its state.

For example, a Student class can have attributes like name, age, and rollNumber that describe the properties of a student object.

What are Class Attributes in Java?

A class attribute is a variable declared inside a class but outside any method, constructor, or block.

Each object created from a class can have its own values for these attributes. These attributes define what information an object stores.

Syntax of Class Attributes in Java

class  ClassName {
    dataType attributeName;
}

Example of Class Attributes in Java

class Student {
    String name;
    int age;
}
public class Main {
    public static void main(String[] args) {
        Student s1 = new Student();
        s1.name = "John";
      s1.age = 20;
        System.out.println(s1.name);
        System.out.println(s1.age);
    }
}

Types of Class Attributes in Java

Java class attributes are mainly divided into different types based on their behavior and declaration.

Instance Attributes in Java

Instance attributes are non-static variables that belong to an object. Every object gets a separate copy of these attributes.

class Car {
    String color;
}
public class Main {
    public static void main(String[] args) {
        Car car1 = new Car(); 
         Car car2 = new Car();
         car1.color = "Red";
        car2.color = "Black";
        System.out.println(car1.color);
        System.out.println(car2.color);
    }
    }

Static Attributes in Java

A static attribute belongs to the class instead of individual objects. Only one copy of a static attribute is created and shared by all objects.

class Student {
    static String school = "ABC School";
}
public class Main {
    public static void main(String[] args) {
        System.out.println(Student.school);
    }
}

Accessing Class Attributes in Java

Class attributes can be accessed using the object name or class name depending on whether they are instance or static attributes.

Access Modifiers for Class Attributes

Advantages of Class Attributes in Java