Question

1. Consider the class Circle below. Add an equals method to this class. The method should accept a Circle object as an argument. It should return true if the argument object contains the same data as the calling object, and false otherwise.

public class Circle
{
    private double radius;
    public Circle(double r)
    {
        radius = r;
    }
    public double getArea()
    {
        return Math.PI * radius * radius;
    }
    public double getRadius()
    {
        return radius;
    }
}

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2. Let’s work some more with the Circle class. Add a greaterThan method for the class. The method should accept a Circle object as an argument. It should return true if the argument object has an area that is greater than the area of the calling object, and false otherwise.

public class Circle
{
    private double radius;
    public Circle(double r)
    {
        radius = r;
    }
    public double getArea()
    {
        return Math.PI * radius * radius;
    }
    public double getRadius()
    {
        return radius;
    }
}

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Answer 1

public class Circle
{
    private double radius;
    public Circle(double r)
    {
        radius = r;
    }
    public double getArea()
    {
        return Math.PI * radius * radius;
    }
    public double getRadius()
    {
        return radius;
    }
    public boolean equals(Circle c){
        if(c.radius == radius){
            return true;
        }
        else{
            return false;
        }
    }
}

public class Circle
{
    private double radius;
    public Circle(double r)
    {
        radius = r;
    }
    public double getArea()
    {
        return Math.PI * radius * radius;
    }
    public double getRadius()
    {
        return radius;
    }
    public boolean greaterThan(Circle c){
        if(c.getArea()>getArea()){
            return true;
        }
        else{
            return false;
        }
    }
}