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Introduction to Classes

Introduction to Classes

Let's learn about classes in Java!

We'll cover the following...

Recap

Since the Hello, World! program, we have been ignoring a couple of repeating lines in all of the Java codes we have seen so far. So, how long are we going to ignore this elephant in the room?

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class HelloWorld 
{
    public static void main(String args[]) 
    {
        System.out.println("Hello World!");
    }
}

We only discussed the fact that line 5 is used to print Hello World! on the screen. But what about the rest of the lines?

Formally, the first line is constructing a class for the HelloWorld program, whereas the third line describes a Java method by the name of main.

What is a class?

Is it the same as the trigonometry class you had at school? Not at ...