Question

JAVA

Design and implement a class called Boxthat represents a 3-dimensional box.1.Instance DataYour Box class will need variables to store the size of the box. All of these variables will be of type ‘private double’.•width•height•depthYour Boxclass will also need a variable to keep track of whether or not the box is full. This will be of type ‘private boolean’.•full2.ConstructorDeclaration: public Box( double width, double height, double depth)•Your Boxconstructor will accept the width, height,and depthof the box.•In your constructor, initialize the width, height,and depthinstance variables to values passed in as parameters to the constructor.•Each newly created box will be empty. This means that you will also need to initialize fullto false in your constructor.3.Getter and Setter MethodsInclude getter and setter methods for all instance data. We will assume that all supplied dimension values are positive values. Here is an example of the method declarations for width to get you started.•Getter: public double getWidth()•Setter: public void setWidth(double width)4.Public Methods•Write a public double volume()method that will calculate and return the volume of the box based on the instance data values.•Write a public double surfaceArea()method that will calculate and return the surface area of the box based on the instance data values.5.toString MethodWrite apublic String toString() method that returns a one-line description of the box. The description should provide its dimensions and whether or not the box is full. Format all double values to 2 decimal places.Example: An empty 4.00x 5.00 x 2.00 box.Part 2: Testing your ClassNow, create a driver class called BoxTestand do the following in the main method.Create your first box1.Create a Boxvariable called smallBoxand instantiate it with width 4, height 5, and depth 2.2.Print the one-line description of smallBoxusing its toString()method.3.Confirm that smallBox’s width, height, and depth getter methods are returning the correct values.4.Confirm that smallBox’s volume()and surfaceArea()methods are returning the correct values.5.Use smallBox’s setter methods to change it from “empty” to “full” and to change its dimension values to width 2, height 3, and depth 1.6.Print the one-line description of smallBoxusing toString()again, and confirm that all changed values are reflected.7.Confirm that all getter and other methods return the correct values reflecting smallBox’s current dimensions and full value.Create several boxes and find the largest oneDo not delete what you did above! Add the following code to the end of your BoxTestclass.1.Declare and instantiate an ArrayListobject that will store your Boxobjects.See the listing below as a sample of how to use the ArrayListbut with Stringobjects.2.In a standard “for” loop that iterates 5 times, create a new Boxwith randomly generated width, height, and depth and add the box to your ArrayList. Limit dimension values to a reasonable range. Randomly generate a Boolean value and use it to call the Box’s method for setting “full” (use the nextBoolean()method in the Randomclass).3.In the loop, print outthe Box’s details, labeled according to the loop iteration (i.e. if this isthe first iteration of the loop, label the box as “Box 1: “ in the output).4.Use a for-each loop(as shown in the listing above)to find the Boxwith the largest volume. You will need to declare a largest box variable of type Boxto keep track of the largest box. This variable needs to be declared outside of the loop so that it will still be available when the loop ends. Use conditional statements inside the loop to compare the current Box to the largest Box, so far, and update the largest box variable when appropriate.5.After the loop, print the details of the largest Box. Confirm that you program identified the correct boxes.

Answer 1

Box.java

=========================

package box;

public class Box {
   // variables to store the size of the box
   private double width;
   private double height;
   private double depth;
   private boolean full;
  
   // constructor
   public Box( double width, double height, double depth) {
       // initialize values
       this.width = width;
       this.height = height;
       this.depth = depth;
       // each newly created box will be empty
       this.full = false;
   }
  
   // getter methods
   public double getWidth() {
       return this.width;
   }
   public double getHeight() {
       return this.height;
   }
   public double getDepth() {
       return this.depth;
   }
   public boolean isFull() {
       return this.full;
   }
  
   // setter methods
   public void setWidth(double width) {
       this.width = width;
   }
   public void setHeight(double height) {
       this.height = height;
   }
   public void setDepth(double depth) {
       this.depth = depth;
   }
   public void setFull(boolean full) {
       this.full = full;
   }
  
   // calculate and returns the volume of the box
   public double volume() {
       return width*height*depth;
   }
  
   // calculate and returns the surface area of the box
   public double surfaceArea() {
       // surface area can be calculated by sum of all sides
       double area = 0.0;
       // calculate top and bottom side
       area = area + 2*width*height;
       // calculate north and south side
       area = area + 2*width*depth;
       // calculate east and west side
       area = area + 2*height*depth;
       // return the area
       return area;
   }
  
   // returns a one-line description of the box
   public String toString() {
       // create a string to return
       String str = "A";
       // check if box is full
       if(full) {
           str = str + " full ";
       }
       else {
           str = str + "n empty ";
       }
       // get width, height and depth
       // format all double values to 2 decimal places
       str = str + String.format("%.2f x %.2f x %.2f box", width, height, depth);
       // return the string
       return str;
   }

}

=========================

BoxTest.java

=========================

package box;

import java.util.ArrayList;
import java.util.Random;

public class BoxTest {
  
   // main method to run the program
   public static void main(String[] args) {
       // create box1
       Box smallBox = new Box(4, 5, 2.2);
       // print the box
       System.out.println(smallBox);
       // testing box's getter methods
       System.out.println("Width of box: " + String.format("%.2f",smallBox.getWidth()));
       System.out.println("Height of box: " + String.format("%.2f",smallBox.getHeight()));
       System.out.println("Depth of box: " + String.format("%.2f",smallBox.getDepth()));
       // testing volume and area methods
       System.out.println("Volume of box: " + String.format("%.2f",smallBox.volume()));
       System.out.println("Surface area of box: " + String.format("%.2f",smallBox.surfaceArea()));
       // testing setter methods
       smallBox.setFull(true);
       smallBox.setWidth(2);
       smallBox.setHeight(3);
       smallBox.setDepth(1.6);
       // print box to check setter methods
       System.out.println("printing box after setting new values:");
       System.out.println(smallBox);
       System.out.println("Width of box: " + String.format("%.2f",smallBox.getWidth()));
       System.out.println("Height of box: " + String.format("%.2f",smallBox.getHeight()));
       System.out.println("Depth of box: " + String.format("%.2f",smallBox.getDepth()));
       System.out.println("Volume of box: " + String.format("%.2f",smallBox.volume()));
       System.out.println("Surface area of box: " + String.format("%.2f",smallBox.surfaceArea()));
      
       // create several boxes
       System.out.println("Random Boxes are: ");
       ArrayList<Box> boxes = new ArrayList<Box>();
       // create random values
       Random rand = new Random();
       for(int i=0;i<5;i++) {
           boxes.add(new Box(rand.nextDouble()*10.0, rand.nextDouble()*10.0, rand.nextDouble()*5.0));
           boxes.get(i).setFull(rand.nextBoolean());
           // print boxes
           System.out.println("Box " + (i+1) + ": " + boxes.get(i));
          
       }
       // print the largest box
       System.out.println("Largest box is: ");
       Box largest = null;
       // use for each loop
       for(Box b : boxes) {
           // compare boxes
           if(largest==null || b.volume()>largest.volume()) {
               largest = b;
           }
       }
       System.out.println(largest);
   }

}

let me know if you have any doubts or problem in the program.