Advanced Programming Concepts Instructor  Please refer to the code in the Appendix to answer the following questions.

 

1. Write the output for each section of print statements. (10 points)

2. Which Rectangle constructor does instance box1 call? Why? What concept does this demonstrate? (10 points)

3. Which Rectangle constructor does instance box2 call? Why? What concept does this demonstrate? (10 points)

4. Which Rectangle constructor does instance box3 call? Why? What concept does this demonstrate? (10 points)

5. What is the connection between box2 and box4? What happens (memory wise) when both box2 and box 4 are declared null? (20 points)

6. In the Main class, there are two variables named z. What is the difference between the two variables? What concept does the output of the last three print statements demonstrate? Explain. (20 points)

7. In the Rectangle class, explain the implementation of the Rectangle(int l, int w) constructor. (10 points) 8. In the Rectangle class, explain the implementation of the Rectangle(Rectangle other) constructor. (10 points)

APPENDIX

RectangleVolume.java

public class RectangleVolume { public int length; public int width; public int height; public RectangleVolume(int l, int w, int h) { length = l; width = w; height = h; } public RectangleVolume(int l, int w) { this(l, w, 5); } public RectangleVolume(RectangleVolume other) { this(other.length, other.width, other.height); } public int calcVolume(){ return length * width * height; } }

Main.java

class Main { static int z; public static void main(String[] args)

{ RectangleVolume box3 = new RectangleVolume(3,4,5); RectangleVolume box1 = new RectangleVolume(box3); RectangleVolume box2 = new RectangleVolume(3,4); RectangleVolume box4 = box2; box1 = null; System.out.println(" "); System.out.println("box(l,w,h) = (" + box3.length + "," + box3.width + "," + box3.height + ")"); System.out.println("box(l,w,h) = (" + box4.length + "," + box4.width + "," + box4.height + ")"); System.out.println("box(l,w,h) = (" + box2.length + "," + box2.width + "," + box2.height + ")"); box2 = null; System.out.println(" "); z = 34; System.out.println("z = " + z); int z; z = box3.calcVolume(); System.out.println("z = " + z); System.out.println("z = " + Main.z); } }