how can I make Locale output that the language of the passport is Russian, and for each element in the array list, to call the method isRussian();

public class Passport implements Comparable<Passport>{ 

    private  String firstName;
    private  String lastName;
    private Locale passportIssue;


// c-tor
public Passport(String firstName, String lastName, Locale passportIssue){ 

      this.firstName = firstName;
      this.lastName = lastName;
      this.passportIssue = passportIssue;

} 

//method
public boolean isRussian() { 

        If(passportIssue== "ru"){
                 return true;
           }
               return false;
    }

}

This is what i have try

List<Passport> pass= new ArrayList<>();Locale a= new Locale("ru");        

Passport p = new Passport("Erika",Ivanovich",new Locale("ru")); 

Passport p1 = new Passport ("Kemal", "Remzi", Locale.ENGLISH)


Passport p2 = new Passport ("Ivana",Bogdan",new Locale("ru"));

pass.add(p);
pass.add(p1);
pass.add(p2);

   System.out.println("Is the passport "   p.getPassIssue()   " russian? "

CodePudding user response：

Locale :: getLanguage

A Locale is composed of a culture and a language.

Apparently you want to compare just the language portion. So get the language code by calling Locale :: getLanguage.

The Javadoc warns that these two-letter codes have been changing. So compare by constructing a new Locale object using your expected code, and then extract the possibly transformed code.

if ( locale.getLanguage().equals( new Locale( "ru" ).getLanguage() ) )  { … }

Or if your intent was the culture portion, access the culture portion using Locale :: getCountry. But keep in mind that Locale is meant for localization usage, not legal usage. The “country” in a Locale is a way of representing culture, not a government or nation-state.

Do not compare strings using ==, which tests the objects’ reference, not the contained text.

CodePudding user response：

You are comparing a string with a Locale in the following line (using the "==" operator, which checks if they are the same instance, and that is never the case)

public boolean isRussian() { 

     return passportIssue.getCountry().equals("RU");
}

Please note, getCountry() returns the country code in upper case (see the documentation here.