Lab: the StreamingPlatform class¶

☕ Java 17 · Your First Java Class · 3/3

Goal: write a complete class with documentation, data, behavior and an entry point, then run it.

Setup: in your project folder, create StreamingPlatform.java. Compile and run it from the terminal.

Step 1 — Document the class¶

Start with a Javadoc comment, then the class declaration:

/**
 * Entry point of the ADC Flix platform.
 * @author Mounir
 */
public class StreamingPlatform {

}

The double asterisk /** makes it Javadoc. @author is a standard Javadoc tag. Editors show this text when you hover over the class name.

Step 2 — Add a field¶

    // Platform name
    String name;

Every StreamingPlatform object will have a name. It gets its value later, once an object exists.

Step 3 — Add a method¶

    // Display a welcome message
    public void launch() {
        System.out.println("ADC Flix is live!");
    }

void: the method does something and returns nothing.

Step 4 — Add the main method¶

    public static void main(String[] args) {
        StreamingPlatform p = new StreamingPlatform();
        p.name = "ADC Flix";
        p.launch();
    }

new StreamingPlatform() creates an object in memory, and p refers to it.
p.name = "ADC Flix" sets the object's field: the dot reaches what belongs to an object.
p.launch() calls the method on that object.

Step 5 — Compile and run¶

$ javac StreamingPlatform.java
$ java StreamingPlatform
ADC Flix is live!

Final code¶

/**
 * Entry point of the ADC Flix platform.
 * @author Mounir
 */
public class StreamingPlatform {

    // Platform name
    String name;

    // Display a welcome message
    public void launch() {
        System.out.println("ADC Flix is live!");
    }

    public static void main(String[] args) {
        StreamingPlatform p = new StreamingPlatform();
        p.name = "ADC Flix";
        p.launch();
    }
}

Full code on GitHub

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