继承和构造函数笔记

package com.box;

public class Box {
	double width;
	double height;
	double depth;
	//封装类成员变量
    Box(Box ob){
		width=ob.width;
		height=ob.height;
		depth=ob.depth;
		System.out.println("我是传递一个对象的构造函数");
    }
    Box(double w,double h,double d){
    	width=w;
    	height=h;
    	depth=d;
    	System.out.println("我是有三个参数的构造函数");
    }
    Box(){
    	width=-1;
    	height=-1;
    	depth=-1;
    	System.out.println("admin我是无参数的构造函数");
    }
    Box(double len){
    	width=height=depth=len;
    	System.out.println("我是double len构造函数");
    }
    double volume() {
    	return width*height*depth;
    }
}
package com.box;

public class Box {
	dou