java 执行区域设置比较的正确方法
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Correct way to perform Locale Comparison
提问by Cheok Yan Cheng
Currently, I wish to know which properties file is being loaded in my application.
目前，我想知道我的应用程序中正在加载哪个属性文件。
/*
* To change this template, choose Tools | Templates
* 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());
}
}
The following is the output :
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 :
Previously, to determine whether properties file Bundle_zh_CH.properties will be loaded, I am performing the following comparison.
之前，为了确定是否会加载属性文件Bundle_zh_CH.properties，我进行了以下比较。
if (Locale.getDefault() == Locale.SIMPLIFIED_CHINESE)
However, some Locale other than SIMPLIFIED_CHINESE will load Bundle_zh_CH.properties as well.
但是，除了 SIMPLIFIED_CHINESE 之外的一些 Locale 也会加载 Bundle_zh_CH.properties。
What is the reliable way for me to do so?
我这样做的可靠方法是什么？
Shall I
我可以吗
if (Locale.getDefault() == Locale.SIMPLIFIED_CHINESE || Locale.getDefault() == Locale.China)
or
或者
if (Locale.getDefault().equals("CN"))
回答by krock
Don't rely on equals operator comparison as you can create new Locale instances with its public constructors. In the following code:
不要依赖等于运算符比较，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));
prints:
印刷：
false
true
