CODEWITHSUNDEEP
javainheritance
annonymousTroll
annonymousTroll

Reputation: 1

Java compiler does not recognize derived class, ie, "symbol not found" error

I am getting a "cannot find symbol" error when I try to compile this code. In the main, I can create objects of type Ball no problem, but if I try to create object of type Basketball, compiler complains. I am very new to java, please help? 

class Ball {
    public double radious;
    public String color;

    Ball( double radious, String color ) {
        this.radious = radious;
        this.color = color;
    }

    public double area() {
        return (4 * Math.pow(this.radious, 2) * Math.PI );
    }

    public void display() {
            System.out.println("\nRadious: " + radious );
            System.out.println("Color: " + color );
    }

    class Basketball extends Ball {
        public int noOfStripes;

        Basketball( int n, double r, String c ) {
            super( r, c );
            noOfStripes = n;
        }

        Basketball( double r, String c ) {
            super( r, c );
            noOfStripes = 8; // Default value 
        }

        public void display() {
            super.display();
            System.out.println("Area: " + area() );
            System.out.println("noOfStripes: " + noOfStripes );
        }
    }
}

class Driver {
    public static void main( String[] args ) {
        Ball basket1 = new Ball( 29.5, "Orange" );
        basket1.display();

        Ball basket2 =new Basketball( 29.5, "Black" );
    }
}

Upvotes: 0

Views: 281

Answers (3)

ifloop
ifloop

Reputation: 8386

Since Basketball is an inner class of Ball you have to create objectes the following way:

Ball.Basketball myBasketball = new Ball().new Basketball(/* foo arguments */);

But a better solution would be, to move it outside to be an own class.

Upvotes: 0

rgettman
rgettman

Reputation: 178293

You have created Basketball not only as a subclass of Ball, but as an inner class as well. It doesn't need to be an inner class.

Define Basketball outside of the braces for the Ball class.

    }
}  // End of Ball class

class Basketball extends Ball
{
   // ...

Upvotes: 3

michaelgulak
michaelgulak

Reputation: 631

You need to qualify BasketBall with Ball:

Ball.Basketball basket2 = new Ball.Basketball( 29.5, "Black" );

As other comments and answers have pointed out, you should not use inner classes for inheritance. BasketBall should be a separate class:

public class BasketBall extends Ball {

}

Upvotes: 0

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