Fields, constructors and methods.
✍️ 2 exercises in this lessonJava is built around classes (blueprints) and objects (instances).
this refers to the current object.new.static members belong to the class, not to individual objects.Mastering Java Classes & Objects helps you write clean and reliable Java code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
class Car {
String brand;
int year;
static int count = 0;
Car(String brand, int year) {
this.brand = brand;
this.year = year;
count++;
}
int age(int currentYear) {
return currentYear - year;
}
}
public class Main {
public static void main(String[] args) {
Car a = new Car("Toyota", 2019);
Car b = new Car("Honda", 2022);
System.out.println(a.brand + " is " + a.age(2026) + " years old");
System.out.println(b.brand + " is " + b.age(2026) + " years old");
System.out.println("Cars created: " + Car.count);
}
}Toyota is 7 years old Honda is 4 years old Cars created: 2
Check what you learned in “Java Classes & Objects”.
Create an object.
Car c = Car("Honda", 2022);
What is a constructor?
Stuck on something?
Ask the community in the CodesInTech forum.
Need a developer?
Learning on your own is great — and when you need professional help, our team builds custom software, websites and mobile apps for clients worldwide.
Explore Our Services