Java Swing - 本地化温度

有没有办法在Java中本地化温度？就像温度格式将基于区域设置？

例如，对于挪威语，温度格式应为 14 °C。度数符号之前应该有一个空格。但其他语言应该是14°C。

以下示例演示了温度本地化，包括按区域设置特定属性对十进制值进行可自定义的舍入和格式设置。

public class LocalTemperature {

    private final Locale locale;
    private final String temperatureFormat;
    private final float conversionFactor;
    private final float conversionOffset;

    public LocalTemperature(ResourceBundle bundle) {
        locale = bundle.getLocale();
        temperatureFormat = bundle.getString("temperature.decimal.format");
        conversionFactor = Float.parseFloat(bundle.getString("temperature.conversion.factor"));
        conversionOffset = Float.parseFloat(bundle.getString("temperature.conversion.offset"));
    }

    public String format(double kelvin) {
        double localTemperature = conversionOffset + conversionFactor * kelvin;

        DecimalFormat format = new DecimalFormat(temperatureFormat, DecimalFormatSymbols.getInstance(locale));

        return format.format(localTemperature); 
    }
}

MyResources_DE.properties：

temperature.conversion.factor=1.0
temperature.conversion.offset=-273.15
temperature.decimal.format=###,###.##°C

MyResources_NR.properties：

temperature.conversion.factor=1.0
temperature.conversion.offset=-273.15
temperature.decimal.format=###,###.## °C

MyResources_en_US.properties：

temperature.conversion.factor=1.8
temperature.conversion.offset=-459.67
temperature.decimal.format=###,###.## °F

这可以通过以下单元测试来验证：

@RunWith(Parameterized.class)
public class LocalTemperatureTest {

    private final double testValue;
    private final String expectedResult;
    private final LocalTemperature testSubject;


    public LocalTemperatureTest(Locale locale, double testValue, String expected) {
        ResourceBundle bundle = ResourceBundle.getBundle("MyResources", locale);

        this.testSubject = new LocalTemperature(bundle);
        this.testValue = testValue;
        this.expectedResult = expected;
    }

    @Test
    public void test() {
        TestCase.assertEquals("Conversion error", expectedResult, testSubject.format(testValue));
    }

    @Parameters(name="{index}: locale={0}  kelvin={1}  expected={2}")
    public static Iterable<Object[]> getTestParameters() {
        Locale norwegian = new Locale("nr");

        Object[][] parameters = {
                {Locale.GERMAN, 0, "-273,15°C"},
                {Locale.GERMAN, 273.15, "0°C"},
                {Locale.GERMAN, 287.15, "14°C"},
                {Locale.GERMAN, 287.35, "14,2°C"},
                {Locale.GERMAN, 287.38, "14,23°C"},
                {Locale.GERMAN, 287.384, "14,23°C"},
                {Locale.GERMAN, 287.385, "14,24°C"},
                {norwegian, 287.15, "14 °C"},
                {Locale.US, 300.0, "80.33 °F"}
        };
        return Arrays.asList(parameters);
    }
}

请注意，根据合同，所有提供的温度值应具有相同的基本比例（此处为开尔文）。