Untitled

class Singer {
    void sing() {
        System.out.println("random song");
    }
}

class Tahsan extends Singer {
    @Override
    void sing() {
        System.out.println("Sei Tumi Keno Eto Ochena Hole");
    }
}

class Arnob extends Singer {
    @Override
    void sing() {
        System.out.println("She Je Boshe Ache");
    }
}

abstract class Vehicle {
    int length;
    int weight;
    double price;

    abstract void accelerate();
    abstract void brake();
}

class Bus extends Vehicle {
    @Override
    void accelerate() {
        System.out.println("Bus is accelerating.");
    }

    @Override
    void brake() {
        System.out.println("Bus is braking.");
    }
}

class Truck extends Vehicle {
    @Override
    void accelerate() {
        System.out.println("Truck is accelerating.");
    }

    @Override
    void brake() {
        System.out.println("Truck is braking.");
    }
}

abstract class Flower {
    String color;
    String smell;
    double price;

    abstract void gift();
    abstract void buy();
}

class Rose extends Flower {
    @Override
    void gift() {
        System.out.println("A " + color + " rose is a great gift!");
    }

    @Override
    void buy() {
        System.out.println("A " + color + " rose costs $" + price + ".");
    }
}

class Marigold extends Flower {
    @Override
    void gift() {
        System.out.println("A " + color + " marigold is a thoughtful gift!");
    }

    @Override
    void buy() {
        System.out.println("A " + color + " marigold costs $" + price + ".");
    }
}
class Shape {
    void printShape() {
        System.out.println("This is a shape.");
    }
}

class Rectangle extends Shape {
    @Override
    void printShape() {
        System.out.println("This is a rectangular shape.");
    }
}

class Circle extends Shape {
    @Override
    void printShape() {
        System.out.println("This is a circular shape.");
    }
}

class Square extends Rectangle {
    void printShape() {
        System.out.println("Square is a rectangle.");
    }
}
public class Client {
    public static void main(String[] args) {
        Color v = new Red();
        v.doColor();
    }
}

class Color {
    void doColor() {
        System.out.println("Color");
    }
}

class Red extends Color {
    @Override
    void doColor() {
        System.out.println("Red Color");
    }
}