java - Testing my program? -

i have class need implement in code. instructions are: code testing program/class. should construct or instantiate objects of class coded in step #1. testing program should call every method make sure work. should construct @ least 2 objects – 1 default constructor , 1 “other” constructor. second scenario, ask user values (radius and) height. may use input , output want this.

this have far , i'm stuck:

public class cube  {     private double height;     public cube(){       height = 1.0;    }     public cube(double h){       height = h;    }     public double getheight(){       return height;    }     public void setheight(double h){       height = h;    }     public double calcvolume() {       return height*height*height;    }     public double calcsurface(){       return height*height*6;    }     public string tostring(){       return this.tostring();    }     public boolean equals(cube c){       return (c.getheight() == this.height);    }  }   import java.util.* public class testthecube  {    public static void main(string[] args)     {     cube cube1 = new cube();    scanner kb = new scanner(system.in);    system.out.print("enter height positive number");    double height = kb.nextdouble();     cube cube2 = new cube(height);     system.out.println(     }  }    

i've invoked calcvolume() of cube1 , cube2.

   cube cube1 = new cube();    scanner kb = new scanner(system.in);    system.out.print("enter height positive number");    double height = kb.nextdouble();     cube cube2 = new cube(height);     system.out.println("cube 1's volume = "+cube1.calcvolume());    system.out.println("cube 2's volume = "+cube2.calcvolume());    .....//repeat every instance method have.