[LumberJack10]

I am creating a object class called Octagon that implements Comparable and Cloneable interface.

Im getting a lot of errors and i do not know whats going on.


import java.util.Scanner;



public class extends GeometricObject implements Cloneable Comparable {
private double width;
private double height;

public Octagon.java() {
width = 0.0;
height = 0.0;
}
public Octagon(double width, double height){
this.width = width;
this.height = height;
}
/**Return Width*/
public double getWidth(){
return width;
}
/**Set new width*/
public void setWidth(double width){
this.width = width;
}
/**Return height*/
public double getheight() {
return height;
}
/**Set a new height */
public void setHeight(double height){
this.height = height;
}
/**Return area*/
public double getArea(){
return ((2 + 4/Math.sqrt(2))side * side);
}
/**Return Perimeter */
public double getPerimeter(){
return 2 * (width + height);
}
}

[macosxnerd101]

Please,

Here, you need to define the class name in addition to separating the interfaces by commas, like so:

public class Octagon extends GeometricObject implements Cloneable, Comparable 

In the constructor, you need to remove the .java extension:

public Octagon.java(){

And lastly, you need to implement the compareTo() method from the Comparable interface or declare your Octagon class as abstract.

[erik.price]

public class extends GeometricObject implements Cloneable Comparable {

You are telling the compiler that your class is called 'extends', which isn't valid, since extends is a keyword.

edit: oops, sorry macosxnerd101, didn't see that you already commented on that error

This post has been edited by erik.price: 27 February 2010 - 03:03 PM

[LumberJack10]

Thanks Guys

I have one more question though, the compiler hates this statement.


return ((2 + 4 / Math.sqrt(2))side * side);

[macosxnerd101]

Unlike in math, having (term)(term) does not mean multiply. If you want an operation to be performed, you have to specify it. So that line should be:
return ((2 + 4 / Math.sqrt(2))*side * side);.

[LumberJack10]

I pretty much have it completed.

How would you suggest making it interactive? Just a normal System.out.print or is there another way.

I'm making it interactive so the user can put in the length of the sides.

[erik.price]

A combination of Scanner and print statements would be fine for making it interactive.

You could also look into making it more visual, with something like a JOptionPane