Practice›Java Fundamentals›Module 8. Interfaces & Abstract Classes›8.3 Abstract classes

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8.3 Abstract classes — extend Shape with Square

Total: 0 / 3 pts

Practice mode — check each part and get hints as you go.

Task

Write Square so that it extends the abstract class Shape. Pass "Square" up with super, and supply the missing area().

You do not write describe() — it is inherited, and it calls your area(). The program prints Square has area 9.0.

Your solution

abstract class Shape {
    private String name;

    public Shape(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public abstract double area();

    public String describe() {
        return name + " has area " + area();
    }
}

class Square extends Shape {
    // a side field, a constructor calling super, then area()

}

public class Main {
    public static void main(String[] args) {
        Square s = new Square(3);
        System.out.println(s.describe());
    }
}

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