?? sphere.java
字號:
class Sphere
{
static final double PI = 3.14; // Class variable that has a fixed value
static int count = 0; // Class variable to count objects
// Instance variables
double radius; // Radius of a sphere
double xCenter; // 3D coordinates
double yCenter; // of the center
double zCenter; // of a sphere
// Class constructor
Sphere(double theRadius, double x, double y, double z)
{
radius = theRadius; // Set the radius
// Set the coordinates of the center
xCenter = x;
yCenter = y;
zCenter = z;
++count; // Update object count
}
// Static method to report the number of objects created
static int getCount()
{
return count; // Return current object count
}
// Instance method to calculate volume
double volume()
{
return 4.0/3.0*PI*radius*radius*radius;
}
}
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