Creating a class,for a box. (Java) -

hi had assignment class:

1. implement class named box have following attributes , methods: int length, width, height string color

2. constructor method that:

   • will initialize 3 integers 10, 8, 6
   • will initialize color “black”
3. a setter , getter method each of 4 attributes
4. a method volume of box
5. a method surface area of box (all 6 sides)

i have getters , setters length width , color. problem volume not calculate if set values different.

it takes initialized values. ideas go it? code below class. example .setlength(7) , instead of printing total 7*8*6, prints out total of 10*8*6.

    public class box     {       private int height = 6;        public void se(int height){       this.height=height;      }        public int getheight(){          return height;      }      private int width = 8;     public void setwidth(int width){       this.width=width;     }        public int getwidth(){          return width;     }      private int length= 10;     public void setlength(int length){       this.length=length;     }        public int getlength(){          return length;     }      private string color="black";      public void setcolor(string color){       this.color=color;     }       public string getcolor(){       return color;     }     private int vol=length*width*height;       public void setvol(int vol){       this.vol=vol;      }     public int getvol(){        return vol;       }   } 

get rid of vol property , setvol setter; that's not part of spec class , root cause of problems. rewrite getvol compute volume length, width, , height each time called.

your current design doesn't work because vol not recalculated whenever length, width, or height changed. keep current set of fields , rewrite dimension setters recalculate vol property each time 1 called. speed getvol getter method @ cost of greater complexity class design , slower setter methods. it's trade-off can make or not, see fit. however, need rid of setvol method, because when set volume, there's no way know how set dimensions values consistent.