如何对List 重新排序

您还可以使用

TreeSet

Comparator

由于每个国家/地区通常有多个区域设置，因此您会得到重复（这将消除这种情况）。有一个美国（西班牙）和一个美国（英语），例如三个瑞士（法国，德国和意大利）。

public class AllLocales {  // Which Locales get priority.  private static final Locale[] priorityLocales = {    Locale.US,    Locale.UK  };  private static class MyLocale implements Comparable<MyLocale> {    // My Locale.    private final Locale me;    public MyLocale(Locale me) {      this.me = me;    }    // Convenience    public String getCountry() {      return me.getCountry();    }    @Override    public int compareTo(MyLocale it) {      // No duplicates in the country field.      if (getCountry().equals(it.getCountry())) {        return 0;      }      // Check for priority ones.      for (int i = 0; i < priorityLocales.length; i++) {        Locale priority = priorityLocales[i];        // I am a priority one.        if (getCountry().equals(priority.getCountry())) {          // I come first.          return -1;        }        // It is a priority one.        if (it.getCountry().equals(priority.getCountry())) {          // It comes first.          return 1;        }      }      // Default to straight comparison.      return getCountry().compareTo(it.getCountry());    }  }  public static List<String> listAll() {    Set<MyLocale> byLocale = new TreeSet();    // Gather them all up.    for (Locale locale : Locale.getAvailableLocales()) {      final String isoCountry = locale.getDisplayCountry();      if (isoCountry.length() > 0) {        //System.out.println(locale.getCountry() + ":" + isoCountry + ":" + locale.getDisplayName());        byLocale.add(new MyLocale(locale));      }    }    // Roll them out of the set.    ArrayList<String> list = new ArrayList<>();    for (MyLocale l : byLocale) {      list.add(l.getCountry());    }    return list;  }  public static void main(String[] args) throws InterruptedException {    // Some demo usages.    List<String> locales = listAll();    System.out.println(locales);  }}