面试题 - 代码与编程题 - 将一个键盘输入的数字转化成中文输出

public class Reader {
  private String strNum;

  private String strNumChFormat;

  private String strNumTemp;

  private int intNumLen;

  private String strBegin;

  public Reader(String strNum) {
    this.strNum = strNum;
  }

  public boolean check(String strNum) {
    boolean valid = false;
    if (strNum.substring(0, 1).equals("0")) {
      this.strNum = strNum.substring(1);
    }
    try {
      new Double(strNum);
      valid = true;
    } catch (NumberFormatException ex) {
      System.out.println("Bad number format!");
    }
    return valid;
  }

  public void init() {
    strNumChFormat = "";
    intNumLen = strNum.length();
    strNumTemp = strNum;
    strNumTemp = strNumTemp.replace('1', '一');
    strNumTemp = strNumTemp.replace('2', '二');
    strNumTemp = strNumTemp.replace('3', '三');
    strNumTemp = strNumTemp.replace('4', '四');
    strNumTemp = strNumTemp.replace('5', '五');
    strNumTemp = strNumTemp.replace('6', '六');
    strNumTemp = strNumTemp.replace('7', '七');
    strNumTemp = strNumTemp.replace('8', '八');
    strNumTemp = strNumTemp.replace('9', '九');
    strNumTemp = strNumTemp.replace('0', '零');
    strNumTemp = strNumTemp.replace('.', '点');
    strBegin = strNumTemp.substring(0, 1);
  }

  public String readNum() {
    if (check(strNum)) {
      init();
      try {
        for (int i = 1, j = 1, k = 1; i < intNumLen; i++) {
          if (strNumTemp.charAt(intNumLen - 1) == '零' && i == 1) {
            strNumChFormat = "位";
          } else if (strNumTemp.charAt(intNumLen - i) == '零' && j == 1) {
            strNumChFormat = "位" + strNumChFormat;
          } else if (strNumTemp.charAt(intNumLen - i) == '点') {
            j = 1;
            k = 1;
            strNumChFormat = strNumTemp.charAt(intNumLen - i) + strNumChFormat;
            continue;
          } else {
            strNumChFormat = strNumTemp.charAt(intNumLen - i) + strNumChFormat;
          }
          if (strNumTemp.charAt(intNumLen - i - 1) != '位' && strNumTemp.charAt(intNumLen - i - 1) != '零') {
            if (j == 1 && i < intNumLen) {
              strNumChFormat = '拾' + strNumChFormat;
            } else if (j == 2 && i < intNumLen) {
              strNumChFormat = '百' + strNumChFormat;
            } else if (j == 3 && i < intNumLen) {
              strNumChFormat = '千' + strNumChFormat;
            }
          }
          if (j == 4 && i < intNumLen) {
            j = 0;
          }
          if (k == 4 && i < intNumLen) {
            strNumChFormat = '万' + strNumChFormat;
          } else if (k == 8 && i < intNumLen) {
            k = 0;
            strNumChFormat = '亿' + strNumChFormat;
          }
          j++;
          k++;
        }
        while (strNumChFormat.indexOf("位") != -1) {
          strNumChFormat = strNumChFormat.replaceAll("位", " ");
        }
        if (strNumChFormat.substring(0, 2) == "一拾") {
          strNumChFormat = strNumChFormat.substring(1, strNumChFormat.length());
        }
        if (strNumChFormat.indexOf("点") >= 0) {
          String rebegin = strNumChFormat.substring(0, strNumChFormat.indexOf("点"));
          String relast = strNumChFormat.substring(strNumChFormat.indexOf("点"), strNumChFormat.length());
          for (int i = 1; i <= relast.length(); i++) {
            relast = relast.replaceAll("拾", "");
            relast = relast.replaceAll("百", "");
            relast = relast.replaceAll("千", "");
            relast = relast.replaceAll("万", "");
            relast = relast.replaceAll("亿", "");
          }
          strNumChFormat = rebegin + relast;
        }
      } catch (ArrayIndexOutOfBoundsException ex) {
        ex.printStackTrace();
      } catch (Exception ex) {
        ex.printStackTrace();
      }
      int off = strNumChFormat.indexOf("点");
      strNumChFormat = strBegin + strNumChFormat.substring(0);
    } else {
      strNumChFormat = "";
    }
    return strNumChFormat;
  }

  public static void main(String args[]) {
    try {
      String number = args[0].toString();
      System.out.println("The number is: " + number);
      Reader reader = new Reader(number);
      System.out.println("Output String: " + reader.readNum());
    } catch (Exception ex) {
      System.out.println("Please input like that: javac Reader <number>");
    }
  }
}