Add a method to Box,as shown here:
class Box {
int width;
int height;
int depth;
void calculateVolume() {
System.out.print("Volume is ");
System.out.println(width * height * depth);
}
}
public class Main {
public static void main(String args[]) {
Box mybox1 = new Box();
mybox1.width = 10;
mybox1.height = 20;
mybox1.depth = 15;
mybox1.calculateVolume();
}
}
This program generates the following output:
Volume is 3000