java - When I create an object and pass arguments my class's constructors fail -

new programming, constructors seem straight forward concept. can't figure out why when create object , pass arguments in test class fail initialize polygon class's fields.

public class polygon{      private int numsides;     private double sidelength, xcoord, ycoord, apothem, perimeter;       public polygon(){         this.numsides = 4;         this.sidelength = 10.0;         this.xcoord = 0.0;         this.ycoord = 0.0;         this.apothem = 5.0;         this.perimeter = 20.0;     }      public polygon(int numsides, double sidelength, double xcoord, double ycoord, double apothem, double perimeter){         this.numsides = numsides;         this.sidelength = sidelength;         this.xcoord = xcoord;         this.ycoord = ycoord;         this.apothem = apothem;         this.perimeter = perimeter;     }      public static double getarea(double apothem, double perimeter) {         double area = .5 * apothem * perimeter;         return area;     }      public static string tostring(int numsides, double sidelength, double xcoord, double ycoord, double apothem){         string results = string.format("tostring() results: (numsides=%d, sidelength=%.1f%n, xcoord=%.1f%n, ycoord=%.1f%n, apothem=%.1f%n)", numsides, sidelength, xcoord, ycoord, apothem);         return results;     } } 

and test class

public class testpolygon {      public static void main(string[] args){            polygon testpoly = new polygon(4, 10.0, 0.0, 0.0, 5.0, 20.0);         string results = testpoly.tostring();         system.out.println(results);         double area = testpoly.getarea();         system.out.printf("getarea() results: %.1f%n", area);         } // end main method  } 

you're calling polygon.tostring() you've implemented polygon.tostring(int, double, double, double, double)

get rid of parameters in tostring() (overriding object.tostring() then) , work fine. also, can't static