I need help wioth my code please

public interface Measurable $\{$

double getMeasure$()$;

$\}$

public class Country implements Measurable $\{$

private String name;

private double area;

public Country$($String name, double area$)\{$

this.name $=$ name;

this.area $=$ area;

$\}$

public String getName$()\{$

return name;

$\}$

public double getArea$()\{$

return area;

$\}$

@Override

public double getMeasure$()\{$

return getArea$()$;

$\}$

$\}$

public class Util $\{$

public static double average$($Measurable$[]$ objects$)\{$

double sum $=0$;

for $($Measurable obj : objects$)\{$

sum $+=$ obj.getMeasure$()$;

$\}$

return objects.length $>0?$ sum $/$ objects.length : $0$;

$\}$

$\}$

public class AverageArrayTester $\{$

public static void main$($String$[]$ args$)\{$

Measurable$[]$ countries $=$ new Measurable$[]\{$

new Country$("$Country A$",30000\mathrm{.}0),$

new Country$("$Country B$",40000\mathrm{.}0),$

new Country$("$Country C$",50000\mathrm{.}0)$

$\}$;

double averageArea $=$ Util.average$($countries$)$;

System.out.println$("$The average area is: $"+$ averageArea$)$;

$\}$

$\}$