Question

public class Country {      
    public static void main(String[] args) {    
        String country_name;
        String capital;
        String iso_numeric;
        String iso2;
        String iso3;

        String[] name = new String[] {"united_state", "united_kingdom", "france", "germany", "canada"};

        for(int i = 0; i < name.length; i++) {
            Country name[i] = new Country();
        }

    }

}

嗨，我有上面的代码：

我想要做的是自动创建Country类的对象引用，所以到最后我应该有类似的东西：

Country united_state = new Country();       
Country united_kingdom = new Country();     
Country france = new Country();     
Country germany = new Country();        
Country canada = new Country();

但是，我收到的错误是：国家名称[i] =新国家（）;

提前感谢您的时间和帮助。

Answer 1

您似乎想要这个：

public class Country {
    private final String name;
    // Add these later
    // private final String capital;
    // private final String iso_numeric;
    // private final String iso2;
    //  private final String iso3;

    public Country(String name) { 
        this.name = name;
    }

    public String getName() { return this.name; }
}

有了这个，你可以这样做：

    String[] name = new String[] {"united_state", "united_kingdom", "france", "germany", "canada"};

    List<Country> countries = new ArrayList<Country>();
    for(int i = 0; i < name.length; i++) {
        countries.add(new Country(name[i]));
    }

Answer 2

在我看来，你想要的是一个枚举：

public enum Country {

    united_states("United States", "Washington", "840", "us", "usa"), 
    united_kingdom("United Kingdom", "London", (* etc */)),
    france(/* etc */), 
    germany(/* etc */),
    canada(/* etc */);

    String country_name;
    String capital;
    String iso_numeric;
    String iso2;
    String iso3;

    private Country(String country_name, String capital, String iso_numeric, String iso2, String iso3) {
        this.country_name = country_name;
        this.capital = capital;
        this.iso_numeric = iso_numeric;
        this.iso2 = iso2;
        this.iso3 = iso3;
    }

}

要获取所有国家/地区的数组，请使用Country.values()。请阅读有关Java枚举的教程以了解更多信息。

如何将String转换为用户定义的对象引用

2 个答案: