Write a main method to test the Cylinder class. --------------------------------

Question

Write a main method to test the Cylinder class.

------------------------------------------------------------------

public class Point
{
protected double x, y; // coordinates of the Point

//Default constructor
public Point()
{
setPoint( 0, 0 );
}

//Constructor with parameters
public Point(double xValue, double yValue )
{
setPoint(xValue, yValue );
}

// set x and y coordinates of Point
public void setPoint(double xValue, double yValue )
{
x = xValue;
y = yValue;
}

// get x coordinate
public double getX()
{
return x;
}

// get y coordinate
public double getY()
{
return y;
}

// convert point into String representation
public String toString()
{
return "[" + String.format("%.2f", x)
+ ", " + String.format("%.2f", y) + "]";
}

//Method to compare two points
public boolean equals(Point otherPoint)
{
return(x == otherPoint.x &&
y == otherPoint.y);
}

//Method to compare two points
public void makeCopy(Point otherPoint)
{
x = otherPoint.x;
y = otherPoint.y;
}

public Point getCopy()
{
Point temp = new Point();

temp.x = x;
temp.y = y;

return temp;
}

// print method
public void printPoint()
{
System.out.print("[" + String.format("%.2f", x)
+ ", " + String.format("%.2f", y) + "]");
}

} // end class Point

------------------------------------------------------------------------

class Circle extends Point{
  
private double radius;
  
Circle(double xValue, double yValue, double radius){
super(xValue, yValue);
this.radius = radius;
}

public double getRadius() {
return radius;
}

public void setRadius(double radius) {
this.radius = radius;
}
  
public void printRadius(){
System.out.format("Radius of the circle: %.2f ",getRadius());  
}

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

public void printArea(){
System.out.format("Area of the circle: %.2f ",getArea());
}

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

public void printCircumference(){
System.out.format("Circumference of the circle: %.2f ",getCircumference());
}
}

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public class Cylinder extends Circle {

private double height;

Cylinder(double xValue, double yValue, double radius, double height) {
super(xValue, yValue, radius);
  
}

public double getHeight() {
return height;
}

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

public double getSurfaceArea() {
return super.getCircumference() * height;
}

public void printSurfaceArea() {
System.out.format("Surface area of the cylinder: %.2f ", getSurfaceArea());
}

public double getVolume() {
return super.getArea() * getHeight();
}

public void printVolume() {
System.out.format("Volume of the cylinder: %.2f ",getVolume());
}
}

Explanation / Answer

In the constructor of cyclinder class

this.height= height;

Need to be included along with the call to super class constructors to set coordinates and radius.

Below is the main class to test cylinder class

Main.java

___________

public class Main
{
   public static void main(String[] args) {
//Create Cylinder
       Cylinder c1 = new Cylinder(2,3,3,4);
   System.out.println("Cylinder height: "+c1.getHeight());
   System.out.println("Cylinder radius: "+c1.getRadius());
   c1.printSurfaceArea();
   c1.printVolume();
  
   //Set new height, radius and point to existing Cylinder
   c1.setHeight(7);
   c1.setRadius(5);
   c1.setPoint(3,4);
   System.out.println("After setting new height,radius,point for existing Cylinder");
   System.out.println("New height: "+c1.getHeight());
   System.out.println("New raidus: "+c1.getRadius());
   System.out.println("New point: ");
   c1.printPoint();
   System.out.println();
   c1.printSurfaceArea();
   c1.printVolume();
  
  
  
   }
}

Output:

_________'

Cylinder height: 4.0               

Cylinder radius: 3.0               

Surface area of the cylinder: 75.40

Volume of the cylinder: 113.10     

After setting new height,radius,point for existing Cylinder   

New height: 7.0                    

New raidus: 5.0                    

New point:                         

[3.00, 4.00]                       

Surface area of the cylinder: 219.91

Volume of the cylinder: 549.78   

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