inheritance

Popcorn Hacks

public class Shape {
    protected String name;
    private int length;
    private int width;

    // Default constructor
    public Shape() {
        this.name = "Shape";
        this.length = 10;
        this.width = 5;
    }

    // Parameterized constructor
    public Shape(String name, int length, int width) {
        this.name = name;
        this.length = length;
        this.width = width;
    }

    // Getter methods
    public String get_name() {
        return this.name;
    }

    public int get_length() {
        return this.length;
    }

    public int get_width() {
        return this.width;
    }

    // Setter methods
    public void set_name(String n) {
        this.name = n;
    }

    public void set_length(int a) {
        this.length = a;
    }

    public void set_width(int b) {
        this.width = b;
    }
}

class Circle extends Shape{
    private int radius;

    Circle() {
        this.name = "Circle";
        this.radius = 1;
    }

    Circle(String name, int radius) {
        this.name = name;
        this.radius = radius;
    }

    public double get_area(){
        double rad = (double)this.radius;

        return Math.PI * Math.pow(rad,2);
    }
}

class Hexagon extends Shape{
    private int sideLength;

    Hexagon() {
        this.name = "Circle";
        this.sideLength = 1;
    }

    Hexagon(String name, int sideLength) {
        this.name = name;
        this.sideLength = sideLength;
    }

    public double get_area(){
        double side = (double)this.sideLength;

        return 3*Math.sqrt(3)/2 * Math.pow(side,2);
    }
}

System.out.println((new Circle("my Circle", 1)).get_area());
System.out.println((new Hexagon("my Hexagon", 2)).get_area());

3.141592653589793
10.392304845413264

class Bird{
    public String name;
    Bird(String name){
        this.name = name;
    }
}

class Parrot extends Bird{
    Parrot(String name){
        super(name);
    }
}

void printBirdStuff(Parrot parr){
    System.out.println(parr.name);
}

Bird myParrot = new Parrot("Parrot!");

printBirdStuff((Parrot)myParrot);

Parrot!