JaJavaBeginnerEditable example10 min

Collections

Collections in practical Java programs, with editable notebook code and a focused exercise.

Lesson notes

This lesson turns collections into a small example you can edit, copy and run locally.

classesstandard libraryapplication structure

Editable notebook cell

Starter code

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

Output

Editable example

Expected output:
Hello Java

Live execution for this language is coming soon. You can edit, copy and run this code locally.

Try this

Change the sample data, predict the output and note what concept changed.

Hint: Make the smallest possible edit first.