Circle Code V3 1/31/20

SimpleCircle.java

package chapter9;

//Define the circle class with two constructors
public class SimpleCircle {
	// properties, attributes, instance variables
	private double radius;
	private double centerX;
	private double centerY;
	
	private static int count;

	public static int getCount() {
		return count;
	}

	/** Constructors */
	public SimpleCircle() {
		this(1, 0, 0);
	}

	public SimpleCircle(double radius) {
		this(radius, 0, 0);
	}
	
	public SimpleCircle(double radius, double centerX, double centerY) {
		this.setRadius(radius);
		this.setCenterX(centerX);
		this.setCenterY(centerY);
		SimpleCircle.count++;
	}
	
	public void finalize() {
		System.out.println("Hi! I'm finalizing!");
		SimpleCircle.count--;
	}
	
//	public String toString() {
//		return "(cx, cy) = " + this.centerX + " " + this.centerY + 
//		       " Radius = " + this.radius;
//	}

	@Override
	public String toString() {
		return "Circle [radius=" + radius + ", centerX=" + centerX + ", centerY=" + centerY + "]";
	}
	
	
	/** Return the area of this circle */

	// circle2.getArea() ===> this == circle2
	// tony.getArea() ====> this == tony
	double getArea() {
		return this.radius * this.radius * Math.PI;
	}

	// Not cool!!!
	static double getArea(SimpleCircle x) {
		return x.radius * x.radius * Math.PI;
	}

	/** Return the perimeter of this circle */
	double getPerimeter() {
		return 2 * this.radius * Math.PI;
	}

	/** Set a new radius for this circle */
	void setRadius(double radius) {
		if (radius >= 0)
			this.radius = radius;
		else
			System.err.println("Negative Radius Detected: " + radius);
	}

	public double getCenterX() {
		return this.centerX;
	}

	public void setCenterX(double centerX) {
		if (centerX >= 0)
			this.centerX = centerX;
		else
			System.err.println("Negative CenterX: " + centerX);		
	}

	public double getCenterY() {
		return centerY;
	}

	public void setCenterY(double centerY) {
		if (centerY >= 0)
			this.centerY = centerY;
		else
			System.err.println("Negative CenterY: " + centerY);	
	}

	double getRadius() {
		return radius;
	}

}

TestCircle2.java

/*
 * Name: Tony
 * Date:
 * Course Number:
 * Course Name:
 * Problem Number:
 * Email: 
 * Short Description of the Problem
 */

package chapter9;

import java.util.Scanner;

public class TestCircle2 {
	private final static String TITLE = "Circle Tester V3.0";
	private final static String CONTINUE_PROMPT = "Do this again? [y/N] ";
	
	//**********************************************
	// Put as many methods you need here
	
	
	//**********************************************
	// Start your logic coding in the process method
	private static void process(Scanner sc, String args[]) {
		System.out.print("Enter Radius: ");
		double r = sc.nextDouble();
		System.out.print("Enter X: ");
		double cx = sc.nextDouble();
		System.out.print("Enter Y: ");
		double cy = sc.nextDouble();
		SimpleCircle circle = new SimpleCircle(r, cx, cy);
		//circle.setCenterX(cx);
		//circle.setCenterY(cy);
		
		//double area = circle.getArea();
		//double peri = circle.getPerimeter();
		//System.out.println("Area = " + area);
		//System.out.println("Peri = " + peri);
		//System.out.println(circle);

		SimpleCircle circle2 = new SimpleCircle(r, cx, cy);
		//circle.setCenterX(cx);
		//circle.setCenterY(cy);
		
		//double area2 = circle2.getArea();
		//double peri2 = circle2.getPerimeter();
		//System.out.println("Area = " + area2);
		//System.out.println("Peri = " + peri2);
		//System.out.println(circle2);
		
		System.out.println("No of Circles: " + SimpleCircle.getCount());
		
		circle = null;
		System.gc();
		
		// Put current program to sleep for 10 msec
		try {
			Thread.sleep(10);
		}
		catch (Exception e) {
			
		}
		
		
		System.out.println("No of Circles: " + SimpleCircle.getCount());

		sc.nextLine();  // Clear Keyboard
	}
	
	//**********************************************
	// Do not change the doThisAgain method
	private static boolean doThisAgain(Scanner sc, String prompt) {
		System.out.print(prompt); 
		String doOver = sc.nextLine();
		return doOver.trim().equalsIgnoreCase("Y");
	}
	
	//**********************************************
	// Do not change the main method
	public static void main(String args[]) {
		System.out.println("Welcome to " + TITLE);
		Scanner sc = new Scanner(System.in);
		do {
			process(sc, args);
		} while (doThisAgain(sc, CONTINUE_PROMPT));
		sc.close();
		System.out.println("Thank you for using " + TITLE);
	}

}