class Box {
	double width; double height; double depth; 
	// в 
	Box(double w,double h,double d) {
		width = w; 	height = h;		depth = d;
	} 
// ûв
	Box() { 
		width = -1;		 height = -1;	depth = -1; //-1ʾδʼĺ
	}
// ӣֻһ
	Box(double len) {
		width = height = depth = len;
	}
	double volume() { //  
		return width * height * depth;
	}
} 
public class OverloadCons {
public static void main(String args[]) {
	// ͬĺ
		Box mybox1 = new Box(10,20,15);
		Box mybox2 = new Box();
		Box mycube = new Box(7); 
		double vol; 
		vol = mybox1.volume();
		System.out.println("Volume of mybox1 is " + vol); 
		vol = mybox2.volume();
		System.out.println("Volume of mybox2 is " + vol);
		vol = mycube.volume();
		System.out.println("Volume of mycube is " + vol);
	}
}
