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

Task 4 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 →

8.3 Abstract classes — Triangle with a custom describe

Total: 0 / 3 pts

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

Task

Write Triangle extends Shape with base and height. Supply area() (half of base times height), and override describe() so it returns the inherited text followed by " (a triangle)".

Use super.describe(). The program prints Triangle has area 6.0 (a triangle).

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 Triangle extends Shape {
    // base and height fields, constructor with super, area(), then override describe()

}

public class Main {
    public static void main(String[] args) {
        Triangle t = new Triangle(4, 3);
        System.out.println(t.describe());
    }
}

Next task →