Practice›Java Fundamentals›Module 8. Interfaces & Abstract Classes›8.4 Choosing

Task 2 of 7 · 0 solved · 7 to go0%

You can read the problem, but answers are checked only for signed-in students. Sign in to answer →

8.4 Choosing — extend and implement

Total: 0 / 3 pts

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

Task

Write Square that extends the abstract class Shape and implements the Printable interface — one class doing both.

Supply area() and label(), where the label is the name in square brackets. The program prints Square, 9.0, [Square].

Your solution

interface Printable {
    String label();
}

abstract class Shape {
    private String name;

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

    public String getName() {
        return name;
    }

    public abstract double area();
}

class Square extends Shape implements Printable {
    // side field, constructor with super, then area() and label()

}

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

Next task →