java编写数字金额大写转换代码及原理

package com.msg;

import java.util.Scanner;

public class Renminbi {

     public static String hangeToBig(double value)
     {
         char[] hunit = { '拾', '佰', '仟' };                                                              // 段内位置表示
         char[] vunit = { '万', '亿' };                                                                       // 段名表示
         char[] digit = { '零', '壹', '贰', '叁', '肆', '伍', '陆', '柒', '捌', '玖' };      // 数字表示
         long midVal = (long) (value * 100);                                                      // 转化成整形
         String valStr = String.valueOf(midVal);                                             // 转化成字符串

         String head = valStr.substring(0, valStr.length() - 2);                    // 取整数部分
         String rail = valStr.substring(valStr.length() - 2);                            // 取小数部分

         String prefix = "";                                                                                    // 整数部分转化的结果
         String suffix = "";                                                                                    // 小数部分转化的结果
         // 处理小数点后面的数
         if (rail.equals("00"))
         // 如果小数部分为0

        {
             suffix = "整";
         }
         else

         // 否则把角分转化出来
         {
             suffix = digit[rail.charAt(0) - '0'] + "角" + digit[rail.charAt(1) - '0'] + "分";          }
         // 处理小数点前面的数
         char[] chDig = head.toCharArray();                                                     // 把整数部分转化成字符数组
         char zero = '0';                                                                                          // 标志'0'表示出现过0
         byte zeroSerNum = 0;                                                                            // 连续出现0的次数
         for (int i = 0; i < chDig.length; i++)
         { // 循环处理每个数字
             int idx = (chDig.length - i - 1) % 4;                                                    // 取段内位置
             int vidx = (chDig.length - i - 1) / 4;                                                     // 取段位置
             if (chDig[i] == '0')
             { // 如果当前字符是0
                 zeroSerNum++;                                                                                // 连续0次数递增
                 if (zero == '0')
                 { // 标志
                     zero = digit[0];
                 }
                 else if (idx == 0 && vidx > 0 && zeroSerNum < 4)
                 {
                     prefix += vunit[vidx - 1];
                     zero = '0';
                 }
                 continue;
             }
             zeroSerNum = 0;                                                                                   // 连续0次数清零
             if (zero != '0')
             { // 如果标志不为0,则加上,例如万,亿什么的
                 prefix += zero;
                 zero = '0';
             }
             prefix += digit[chDig[i] - '0'];                                                              // 转化该数字表示
             if (idx > 0)
                 prefix += hunit[idx - 1];
             if (idx == 0 && vidx > 0)
             {
                 prefix += vunit[vidx - 1];                                                                  // 段结束位置应该加上段名         

             }
         }

         if (prefix.length() > 0)
             prefix += '元';                                                                                         // 如果整数部分存在,则有元的字样
         return prefix + suffix;                                                                              // 返回正确表示
     }

     public static void main(String[] args) {
      
      Scanner scanner  = new Scanner(System.in);
      System.out.println("输入您要转换的金额:");
      double value = scanner.nextDouble();
      System.out.println(hangeToBig(value));
  }

}

 

运行结果:


输入您要转换的金额:
2022125.52
贰佰零贰万贰仟壹佰贰拾伍元伍角贰分

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