Java code that completes the conversion function between Chinese and Pinyin

public static void main(String[] args) {
    System.out.println(getPingYin("小龙驿站"));
  }
  public static String getPingYin(String str) {
    char[] t1 = null;
    t1 = str.toCharArray();
    String[] t2 = new String[t1.length];
    HanyuPinyinOutputFormat t3 = new HanyuPinyinOutputFormat();
    t3.setCaseType(HanyuPinyinCaseType.LOWERCASE);
    t3.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
    t3.setVCharType(HanyuPinyinVCharType.WITH_V);
    String t4 = "";
    int t0 = t1.length;
    try {
      for (int i = 0; i < t0; i++) {
        // 判断能否为汉字?
        if (Character.toString(t1[i]).matches("[\\u4E00-\\u9FA5]+")) {
          t2 = PinyinHelper.toHanyuPinyinStringArray(t1[i], t3);// 将汉字的几种全拼都存到t2数组?
          t4 += t2[0];// 取出该汉字全拼的第一种读音并连接到字符串t4?
        } else {
          // 如果不是汉字字符，间接取出字符并连接到字符串t4?
          t4 += Character.toString(t1[i]);
        }
      }
    } catch (BadHanyuPinyinOutputFormatCombination e) {
      e.printStackTrace();
    }
    return t4;