Java Programming

user580947 wrote:
public class BrowseISDO3166Test {
 public static void main(String[] args) {
 BrowseISDO3166Test object = new BrowseISDO3166Test();
 object.init();
 }
 String[][] countries; //***1
 public void init() {
 String[] countryCodes = Locale.getISOCountries();
 int x = 0;
 for (String countryCode : countryCodes) {
 Locale obj = new Locale("", countryCode);
 String code = obj.getCountry();
 String name = obj.getDisplayCountry();
 countries[x][0] = code; //***2
 countries[x][1] = name;
 x++;
 }
 }
}

The countries member variable is not initialized before the assignment (***2) of values. The declaration of the variable does not have an initialization, so the variable is null at ***1. Trying to access an index of the array for set/get will result in NPE just like any other java.lang.Object.

You may do something like ... to overcome the NPE,

   String[][] countries;
   public void init()
   {
      String[] countryCodes = Locale.getISOCountries();
      countries = new String[countryCodes.length][2];
      int x = 0;
      for (String countryCode : countryCodes)
      {
         Locale obj = new Locale("", countryCode);
         String code = obj.getCountry();
         String name = obj.getDisplayCountry();
         countries[x][0] = code;
         countries[x][1] = name;
         x++;
      }
   }