Practice›Java Fundamentals›Module 8. Interfaces & Abstract Classes›8.1 Interfaces

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8.1 Interfaces — name of the largest shape

Total: 0 / 3 pts

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

Task

Fill in largestName so that it returns the name() of the shape with the largest area. Assume the array is not empty.

The program prints Rect.

Your solution

interface Shape {
    double area();
    String name();
}

class Circle implements Shape {
    private double r;

    public Circle(double r) {
        this.r = r;
    }

    public double area() {
        return 3.14 * r * r;
    }

    public String name() {
        return "Circle";
    }
}

class Rect implements Shape {
    private double w;
    private double h;

    public Rect(double w, double h) {
        this.w = w;
        this.h = h;
    }

    public double area() {
        return w * h;
    }

    public String name() {
        return "Rect";
    }
}

public class Main {

    public static String largestName(Shape[] shapes) {
        // return the name of the shape with the biggest area

    }

    public static void main(String[] args) {
        Shape[] shapes = {new Circle(1), new Rect(2, 3)};
        System.out.println(largestName(shapes));
    }
}

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