我在 java 做国际化。
我创建了两个文件： MessageBundle_en_US.properties 以及 MessageBundle_en_IN.properties . MessageBundle_en_US.properties :

greeting=Hello, how are you?
``` `MessageBundle_en_IN.properties` ```
greeting=Halo, apa

最后，这里是主要课程：

import java.util.*;

public class InternationalizationDemo {
    public static void main(String[] args) {
        ResourceBundle bundle =
            ResourceBundle.getBundle("MessageBundle", Locale.US);

        System.out.println(
            "Message in "
          + Locale.US
          + ": "
          + bundle.getString("greeting")
        );

        //changing the default locale to indonasian
        Locale.setDefault(new Locale("in", "ID"));
        bundle = ResourceBundle.getBundle("MessageBundle");

        System.out.println(
            "Message in "
          + Locale.getDefault()
          + ": "
          + bundle.getString("greeting")
        );
    }
}

我收到以下错误：

Exception in thread "main" java.util.MissingResourceException: Can't find bundle for base name MessageBundle, locale en_US
    at java.base/java.util.ResourceBundle.throwMissingResourceException(ResourceBundle.java:2055)
    at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1689)
    at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1593)
    at java.base/java.util.ResourceBundle.getBundleImpl(ResourceBundle.java:1556)
    at java.base/java.util.ResourceBundle.getBundle(ResourceBundle.java:932)
    at provame.InternationalizationDemo.main(InternationalizationDemo.java:8)

更新我已经找到了无法看到文件的原因，首先您需要将*properties文件放在与主类相同的目录中，就像人们在评论中建议的那样，您应该这样调整对文件的调用：

projectName/propertiesFileName

这就是全部。