您可以检查/调试源代码以查看为什么没有任何变化：

You can check/debug the source code to see why nothing changes:

Collator.getInstance(Locale.GERMANY);

调用以下代码：

public static synchronized
Collator getInstance(Locale desiredLocale)
{
    // Snipping some code here
    String colString = "";
    try {
        ResourceBundle resource = LocaleData.getCollationData(desiredLocale);

        colString = resource.getString("Rule");
    } catch (MissingResourceException e) {
        // Use default values
    }
    try
    {
        result = new RuleBasedCollator( CollationRules.DEFAULTRULES +
                                        colString,
                                        CANONICAL_DECOMPOSITION );
    }
// Snipping some more code here

在这里你可以看到默认值 code> Collat​​ionRules.DEFAULTRULES / code>）。

Over here you can see that the specific rules (colString which is empty in your case anyway) are placed after the defaults (CollationRules.DEFAULTRULES).

并且您已经发现默认值首先放置数字：

And as you have discovered that defaults have the numerics placed first:

  // NUMERICS

    + "<0<1<2<3<4<5<6<7<8<9"
    + "<\u00bc<\u00bd<\u00be"   // 1/4,1/2,3/4 fractions

    // NON-IGNORABLES
    + "<a,A"
    + "<b,B"
    + "<c,C"
    + "<d,D"