将阿拉伯数字转换成中文数字表示

package contest.numtochi;import java.util.HashMap;import java.util.Scanner;public class NumToChi{//创建数字和中文数字一一对应的映射private HashMap<Integer, String> map;//创建位数和中文单位的一一映射private HashMap<Integer, String> unit;// 判断输入的字符串是否全是数字public boolean isNum(String str) {boolean flag = true;try {Integer.parseInt(str);} catch (Exception e) {flag = false;System.out.println("用户输入的字符不是数字");}return flag;}// 给map赋值，使数字和中文数字意义对应public void initMap() {map = new HashMap<Integer, String>();map.put(0, "零");map.put(1, "一");map.put(2, "二");map.put(3, "三");map.put(4, "四");map.put(5, "五");map.put(6, "六");map.put(7, "七");map.put(8, "八");map.put(9, "九");}// 给unit赋值，表示表示数字单位public void initUnit() {unit = new HashMap<Integer, String>();unit.put(0, "");unit.put(1, "十");unit.put(2, "百");unit.put(3, "千");unit.put(4, "万");unit.put(5, "十");unit.put(6, "百");unit.put(7, "千");}// 将全是数字的字符串转换成中文数字表示的方法public String change(String str) {String chinese = "";// 去掉头部的0str = String.valueOf(Integer.parseInt(str));// 将数字转换成中文数字for (int i = 0; i < str.length(); i++) {int index = str.charAt(i) - 48;chinese += map.get(index);chinese += unit.get(str.length() - i - 1);}// 处理字符串中的零while ((chinese.indexOf("零十") != -1) || (chinese.indexOf("零百") != -1)|| (chinese.indexOf("零千") != -1)|| (chinese.indexOf("零零") != -1)) {if (chinese.indexOf("零十") != -1) {chinese = chinese.replaceAll("零十", "零");}if (chinese.indexOf("零百") != -1) {chinese = chinese.replaceAll("零百", "零");}if (chinese.indexOf("零千") != -1) {chinese = chinese.replaceAll("零千", "零");}if (chinese.indexOf("零零") != -1) {chinese = chinese.replaceAll("零零", "零");}}if(chinese.indexOf("零万") != -1){chinese = chinese.replaceAll("零万", "万");}//如果结尾有零if(chinese.lastIndexOf("零") == chinese.length()-1){chinese = chinese.substring(0, chinese.length()-1);}return chinese;}public static void main(String[] args) {NumToChi ntc = new NumToChi();System.out.println("请输入要转换的数字字符串：");Scanner s = new Scanner(System.in);String str = s.next();if (ntc.isNum(str)) {ntc.initMap();ntc.initUnit();System.out.println(ntc.change(str));}}}