执行区域设置比较的正确方法

Question

目前，我想知道哪个属性文件正在加载到我的应用程序中。

/*
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 * and open the template in the editor.
 */

package example0;

import java.util.Locale;

/**
 *
 * @author yccheok
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        //Locale.setDefault(Locale.SIMPLIFIED_CHINESE);     // Bundle_zh_CH.properties will be loaded.
        //Locale.setDefault(Locale.CHINA);                  // Bundle_zh_CH.properties will be loaded.
        //Locale.setDefault(Locale.TRADITIONAL_CHINESE);    // Bundle.properties will be loaded.
        //Locale.setDefault(Locale.CHINESE);                // Bundle.properties will be loaded.

        String Hello = java.util.ResourceBundle.getBundle("example0/Bundle").getString("HELLO");
        System.out.println(Hello);

        System.out.println("Locale.SIMPLIFIED_CHINESE's language : " + Locale.SIMPLIFIED_CHINESE.getLanguage());
        System.out.println("Locale.CHINA's language : " + Locale.CHINA.getLanguage());
        System.out.println("Locale.TRADITIONAL_CHINESE's language : " + Locale.TRADITIONAL_CHINESE.getLanguage());
        System.out.println("Locale.CHINESE's language : " + Locale.CHINESE.getLanguage());

        System.out.println("Locale.SIMPLIFIED_CHINESE's country : " + Locale.SIMPLIFIED_CHINESE.getCountry());
        System.out.println("Locale.CHINA's country : " + Locale.CHINA.getCountry());
        System.out.println("Locale.TRADITIONAL_CHINESE's country : " + Locale.TRADITIONAL_CHINESE.getCountry());
        System.out.println("Locale.CHINESE's country : " + Locale.CHINESE.getCountry());
    }

}

以下是输出：

Hello
Locale.SIMPLIFIED_CHINESE's language : zh
Locale.CHINA's language : zh
Locale.TRADITIONAL_CHINESE's language : zh
Locale.CHINESE's language : zh
Locale.SIMPLIFIED_CHINESE's country : CN
Locale.CHINA's country : CN
Locale.TRADITIONAL_CHINESE's country : TW
Locale.CHINESE's country : 

以前，为了确定是否加载属性文件Bundle_zh_CH.properties，我执行了以下比较。

if (Locale.getDefault() == Locale.SIMPLIFIED_CHINESE)

但是，SIMPLIFIED_CHINESE以外的其他语言环境也会加载Bundle_zh_CH.properties。

我这样做的可靠方法是什么？

我要不要

if (Locale.getDefault() == Locale.SIMPLIFIED_CHINESE || Locale.getDefault() == Locale.China)

或

if (Locale.getDefault().equals("CN"))

Answer 1

不要依赖于equals运算符比较，因为您可以使用其公共构造函数创建新的Locale实例。在以下代码中：

Locale simpChinese = new Locale("zh","CN","");
System.out.println(simpChinese == Locale.SIMPLIFIED_CHINESE);
System.out.println(simpChinese.equals(Locale.SIMPLIFIED_CHINESE));

打印：

false
true