java开源类库pinyin4j的使用

import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import net.sourceforge.pinyin4j.PinyinHelper;
public class PinyinComparator implements Comparator<Object> {
    private String concatPinyinStringArray(String[] pinyinArray) {
        StringBuffer pinyinStrBuf = new StringBuffer();
        if ((null != pinyinArray) && (pinyinArray.length > 0)) {
            for (int i = 0; i < pinyinArray.length; i++) {
                pinyinStrBuf.append(pinyinArray[i]);
            }
        }
        String outputString = pinyinStrBuf.toString();
        return outputString;
    }
    public int compare(Object o1, Object o2) {
        int length1 = ((String) o1).length();
        int length2 = ((String) o2).length();
        int length = length1 - length2 > 0 ? length2 : length1;
        for (int i = 0; i < length; i++) {
            char c1 = ((String) o1).charAt(i);
            char c2 = ((String) o2).charAt(i);
            String c1topinyin = concatPinyinStringArray(PinyinHelper.toHanyuPinyinStringArray(c1));
            String c2topinyin = concatPinyinStringArray(PinyinHelper.toHanyuPinyinStringArray(c2));
       &nbs