Untitled

public class Sphere {

double diameter;


public Sphere(double diameter) {
super();
this.diameter = diameter;
}

public double getDiameter() {
return diameter;
}

public void setDiameter(double diameter) {
this.diameter = diameter;
}

// calculate volume and return the volume
public double calcVolume() {

double radius = this.diameter /2;

/*
* If you are a beginner then declare like this
*
* double volume = 4/3 * 3.1415* (radius * radius * radius);
*
* Same output will come
* */

double volume = ( 4/3 * Math.PI * Math.pow(radius, 3));

return volume;
}

// calclate surface and return the value
public double calcSurfaceArea() {
double radius = this.diameter /2;
// If you strange to Mathi.PI function then replace Math.PI with 3.1415
double surface = 4 * Math.PI * (radius * radius);
return surface;
}


/*Here we are using format for the string to get the decimal place with 3.
* %f indicates the float value if we give %.2f it gives 2 decimal place. Here we need 3 decimal
* places so It should be like %.3f
*
* this refers to current object instance variable
* */


public String toString() {
return String.format("Sphere with diameter : %.3f \t Volume : %.3f \t Surface : %.3f",this.diameter, this.calcVolume(),this.calcSurfaceArea());
}
public static void main(String[] args) {
Sphere sphere = new Sphere(6);
System.out.println(sphere); // it calls automatically toString method. No need to call explicitly
Sphere sphere2 = new Sphere(12);
System.out.println(sphere2);
}
}