Java 字符串列表拼音排序功能类

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对于List列表接口的排序通常用的是Collections.sort(List<T> list, Comparator<? super T> c) 方法，因此比较器部分Comparator需要自己去写。以下是一个按拼音正、反排序的功能类。

import java.text.Collator;
import java.util.Comparator;

public class PinyinComparator implements Comparator<String>
{
   public final static int UP = 1;

   public final static int DOWN = -1;

   private int state;

   Comparator cmp = Collator.getInstance(java.util.Locale.CHINA);

   public PinyinComparator(int state) {
       this.state = state;
   }

   public PinyinComparator() {
       this.state = PinyinComparator .UP;

   }

   @Override
   public int compare(String o1, String o2)
   {
       // TODO Auto-generated method stub
       if (state == PinyinComparator .DOWN)
       {
           return sortDown(o1, o2);
       }
       else
           return sortUp(o1, o2);
   }

   private int sortUp(String o1, String o2)
   {
       return cmp.compare(o1, o2);
   }

   private int sortDown(String o1, String o2)
   {
       int result = cmp.compare(o1, o2);

       if ( result > 0)
       {
           return -1;
       } else if ( result < 0)
       {
           return 1;
       } else
       {
           return 0;
       }
   }

}