Classes

In Java, every piece of code you write lives inside a class. A class is like a container or blueprint that holds all your program code together. Without a class, there is no program in Java.

public class Main {

}

The keyword "class" tells the Java compiler: "A new class starts here." Before it usually comes "public" — this means the class is visible and usable from anywhere, not just within its own file.

public class Car {

}

In Java, every piece of code you write belongs inside a ____.

By convention, a class name should start with a capital letter, for example "Main", "Car", or "Calculator". This isn't a strict compiler rule, but practically every Java developer follows it so code looks consistent for everyone.

What best describes a class in Java?

A Java program can't exist without at least one class — all the code must be housed inside one. Next, we'll look at how a program inside such a class actually starts running: with the main() method.

A Java program can be written completely without a class.