Fields
Description
Fields store an object's state.
Explanation
Each object gets its own field values.
Example
String name;
int score;← Chapter 6 — Object-Oriented Programming
22. Classes & Objects
mixed
Description
A class is a blueprint that describes data and behavior. An object is a concrete instance created from that blueprint.
For example, a Student class can describe a name and score, while Aditi and Rohan are individual Student objects with their own values.
Subtopics
Creating objects
Description
new creates an object from a class.
Explanation
The variable stores a reference to that object.
Example
Student aditi = new Student();Explanation
Putting related data and behavior together makes programs easier to understand. Start with small classes whose responsibility is obvious.
Example
public class StudentDemo {
static class Student {
String name;
int score;
}
public static void main(String[] args) {
Student aditi = new Student();
aditi.name = "Aditi";
aditi.score = 92;
System.out.println(aditi.name + ": " + aditi.score);
}
}Key points
- A class is a blueprint.
- An object is a class instance.
- Fields hold object state.