Question

this is for java programming

Please Use Comments

I am not 100% sure if my code needs work, this code is for the geometric if you feel like you need to edit it please do :)

Problem Description:

Modify the GeometricObject class to implement the Comparable interface and define a static max method in the GeometricObject class for finding the larger (in area) of two GeometricObject objects. Draw the UML and implement the new GeometricObject class and its two subclasses named Circle and Rectangle. Write a test program that uses the max method to find the larger of two circles (c1 of the radius 1.2 and c2 of the radius 1.2) and the larger of one circle (c1 of the radius 1.2) and one rectangle (of the length 5 and width 3.4.

Sample run (red indicates user input)

Comparing two circles:

The two shapes are equal.

Comparing a circle and a rectangle:

The greater shape is the rectangle of length 5.0 and width 3.4

This is the geometric object code(Keep in mind you can change this if needed, only posted to make your life easier) But please make sure the classes are clearly seperated. If you wish to make your own code rather than the one below please do so

GeometricObject:
public abstract class GeometricObject {
private String color = "white";
private boolean filled;
private java.util.Date dateCreated;

/** Construct a default geometric object */
public GeometricObject() {
dateCreated = new java.util.Date();
}

/** Construct a geometric object with color and filled value */
protected GeometricObject(String color, boolean filled) {
dateCreated = new java.util.Date();
this.color = color;
this.filled = filled;
}

/** Return color */
public String getColor() {
return color;
}

/** Set a new color */
public void setColor(String color) {
this.color = color;
}

/** Return filled. Since filled is boolean,
so, the get method name is isFilled */
public boolean isFilled() {
return filled;
}

/** Set a new filled */
public void setFilled(boolean filled) {
this.filled = filled;
}

/** Get dateCreated */
public java.util.Date getDateCreated() {
return dateCreated;
}

/** Return a string representation of this object */
public String toString() {
return "created on " + dateCreated + "\ncolor: " + color +
" and filled: " + filled;
}

/** Abstract method getArea */
public abstract double getArea();

/** Abstract method getPerimeter */
public abstract double getPerimeter();
}

Example of a comparator:
import java.util.Comparator;

public class GeometricObjectComparator
implements Comparator<GeometricObject>, java.io.Serializable {
public int compare(GeometricObject o1, GeometricObject o2) {
double area1 = o1.getArea();
double area2 = o2.getArea();

if (area1 < area2)
return -1;
else if (area1 == area2)
return 0;
else
return 1;
}
}

Example of Max.java:
public class Max {
/** Return the maximum between two objects */
public static Comparable max(Comparable o1, Comparable o2) {
if (o1.compareTo(o2) > 0)
return o1;
else
return o2;
}
}

Example of another Max.java:
public class Max1 {
/** Return the maximum between two objects */
public static <E extends Comparable<E>> E max(E o1, E o2) {
if (o1.compareTo(o2) > 0)
return o1;
else
return o2;
}
}

If you need more info comment! please and thanks :)

Answer 1

It will help you 

package geometricobject;

public abstract class GeometricObject implements Comparable<GeometricObject> {

private String color = "white";
private boolean filled;
private java.util.Date dateCreated;

protected GeometricObject(){
    dateCreated = new java.util.Date();
}

protected GeometricObject(String color, boolean filled){
    dateCreated = new java.util.Date();
    this.color = color;
    this.filled = filled;
}

public String getColor(){
    return color;
}

public void setColor(String color){
    this.color = color;
}

public boolean isFilled(){
    return filled;
}

public void setFilled(boolean filled){
    this.filled = filled;
}

public java.util.Date getDateCreated() {
    return dateCreated;
}

public String toString() {
    return "Created on " + dateCreated + "\ncolor: " + color + 
            "and filled: " + filled;
}

public static void main(String[] args) {
    GeometricObject circle1 = new Circle(1, "Red", true);
    GeometricObject circle2 = new Circle(2, "Blue", false);
    GeometricObject maxCircle = new Circle();
    GeometricObject rect1 = new Rectangle(1, 1, "Red", true);
    GeometricObject rect2 = new Rectangle(2, 2, "Blue", false);
    GeometricObject maxRect = new Rectangle();

    maxCircle = GeometricObject.max(circle1, circle2);
    maxRect = GeometricObject.max(rect1, rect2);

    System.out.println(maxCircle.toString());
    System.out.println(maxRect.toString());

}

public static GeometricObject max (GeometricObject o1, GeometricObject o2){
    if (((Comparable)o1).compareTo(o2) > 0 )
         return o1;
    else
         return o2;
}

public interface Comparable {
        public int compareTo(GeometricObject o);
    }

public int compareTo(GeometricObject o) {
        if (this.getArea() > o.getArea())
            return 1;
        else if (this.getArea() < o.getArea())
            return -1;
        else 
            return 0;
    }

    public abstract double getArea();

}

The circle class

class Circle extends GeometricObject {
    private double radius;

    public Circle() {
    }

    public Circle(double radius){
        this.radius = radius;
    }

    public Circle(double radius, String color, boolean filled){
        this.radius = radius;
        setColor(color);
        setFilled(filled);
    }

    public double getRadius(){
        return radius;
    }

    public void setRadius(double radius){
        this.radius = radius;
    }

    public double getArea(){
        return radius * radius * Math.PI;
    }

    public double getDiameter(){
        return 2 * radius;
    }

    public double getPerimeter(){
        return 2 * radius * Math.PI;
    }

    public void printCircle() {
        System.out.println("The circle is created " + getDateCreated() +
            " and the radius is " + radius);
    }    

}

The rectangle class

class Rectangle extends GeometricObject {
    private double width;
    private double height;

    public Rectangle() {
    }

    public Rectangle(double Width, double Height){
        this.width = Width;
        this.height = Height;
    }

    public Rectangle(double Width, double Height, String Color, boolean Filled){
        this.width = Width;
        this.height = Height;
        setColor(Color);
        setFilled(Filled);
    }

    public double getWidth(){
        return width;
    }

    public double getHeight(){
        return height;
    }

    public void setHeight(double Height){
        this.height = Height;
    }

    public double getArea(){
        return width * height;
    }

    public double getPerimeter(){
        return 2 * (width + height);
    }       

}