思路和具体方法都在注释中说明
package ClassicArithmetic; import java.util.Scanner; /* * @author:LOHAS翀 * @time:2019/11/1 * * 人民币大小写转换（阿拉伯数字转汉字） * 要求： * 1)输入小写数字金额，输出大写汉字金额 * 2)最大单位支持到亿，最小单位主持到分(即阿拉伯数字支持小数点后两位)，超出范围输出错误提示 * 3)对输入进行校验，不能出现运行错误 * 4)符合人民币金额格式，如：亿/万/元等前不可出现零等 * */ public class UnitTranslate { //定义数字对应的汉字 public final static String[] num = {"零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"}; //定义单位 public final static String[] unit = {"", "拾", "佰", "仟"}; public static void main(String[] args) { while (true) { try { System.out.println("请输入数字："); Scanner sc = new Scanner(System.in); String input = sc.next(); //对数字进行整数和小数的分隔 String[] numString = input.split("\\."); //若是整数则将其转换为有小数的数 if (numString.length == 1) { input += ".0"; numString = input.split("\\."); } //将整数进行分隔 String[] zhengshu = numString[0].split(""); //将数字前的0去掉 while (zhengshu[0].equals("0") && zhengshu.length > 1) { String[] tmp = new String[zhengshu.length - 1]; for (int i = 0; i < zhengshu.length - 1; i++) { tmp[i] = zhengshu[i + 1]; } zhengshu = tmp; } //对小数进行分隔 String[] xiaoshu = numString[1].split(""); //若格式不对则抛出异常 if (xiaoshu.length > 2 || numString.length != 2 || zhengshu.lenth > 12) { throw new Exception(); } else if (xiaoshu.length == 1 && xiaoshu[0].equals("0")) { //小数部分为0的情况 printInfo(zhengshu, xiaoshu); } else if (xiaoshu.length == 1 && !xiaoshu[0].equals("0")) { printInfo(zhengshu, xiaoshu); System.out.print(num[Integer.parseInt(xiaoshu[0])] + "角"); } else if (xiaoshu.length == 2) { printInfo(zhengshu, xiaoshu); System.out.print(num[Integer.parseInt(xiaoshu[0])] + "角"); System.out.print(num[Integer.parseInt(xiaoshu[1])] + "分"); } break; } catch (NumberFormatException e) { System.out.println("输入有误"); } catch (Exception e) { System.out.println("输入有误"); } } } public static void printInfo(String[] zhengshu, String[] xiaoshu) { int tmp = 0; //该标志位用来记录对unit的操作地址 int zeroNum = 0; //记录从右到左第5到第8位0的个数 //数字为亿级 if (zhengshu.length > 8) { for (int i = 0; i < zhengshu.length - 8; i++) { int nums = Integer.parseInt(zhengshu[i]); //判断相邻是否为0 if (zhengshu[i].equals("0") && zhengshu[i + 1].equals("0") && i + 1 < zhengshu.length - 8) { continue; } //若0在级的最后一位则不输出 if (i == zhengshu.length-8-1 &&zhengshu[zhengshu.length-8-1].equals("0")){ break; } //若有相邻的0则输出最后一个0 if (zhengshu[i].equals("0")) { System.out.print(num[nums]); } else { System.out.print(num[nums] + unit[zhengshu.length - 8 - 1 - i]); } } System.out.print("亿"); for (int i = zhengshu.length - 8; i < zhengshu.length - 4; i++) { int nums = Integer.parseInt(zhengshu[i]); if (zhengshu[i].equals("0") && zhengshu[i + 1].equals("0") && i + 1 < zhengshu.length - 4) { tmp++; zeroNum++; continue; } if (i == zhengshu.length - 5 && zhengshu[zhengshu.length - 5].equals("0")) { break; } if (zhengshu[i].equals("0")) { System.out.print(num[nums]); tmp++; } else { System.out.print(num[nums] + unit[3 - tmp]); tmp++; } } if (zeroNum != 3) { System.out.print("万"); } tmp = 0; for (int i = zhengshu.length - 4; i < zhengshu.length; i++) { int nums = Integer.parseInt(zhengshu[i]); if (i + 1 < zhengshu.length && zhengshu[i].equals("0") && zhengshu[i + 1].equals("0")) { tmp++; continue; } if (i == zhengshu.length - 1 && zhengshu[zhengshu.length - 1].equals("0")) { break; } if (zhengshu[i].equals("0")) { System.out.print(num[nums]); tmp++; } else { System.out.print(num[nums] + unit[3 - tmp]); tmp++; } } System.out.print("元"); tmp = 0; } else if (zhengshu.length > 4) { //数字为万级 for (int i = 0; i < zhengshu.length - 4; i++) { int nums = Integer.parseInt(zhengshu[i]); if (zhengshu[i].equals("0") && zhengshu[i + 1].equals("0") && i + 1 < zhengshu.length - 4) { continue; } if (i == zhengshu.length - 4 -1 && zhengshu[zhengshu.length-4-1].equals("0")){ break; } if (zhengshu[i].equals("0")) { System.out.print(num[nums]); } else { System.out.print(num[nums] + unit[zhengshu.length - 4 - 1 - i]); } } System.out.print("万"); for (int i = zhengshu.length - 4; i < zhengshu.length; i++) { int nums = Integer.parseInt(zhengshu[i]); if (i + 1 < zhengshu.length && zhengshu[i].equals("0") && zhengshu[i + 1].equals("0")) { tmp++; continue; } if (i == zhengshu.length - 1 && zhengshu[zhengshu.length - 1].equals("0")) { break; } if (zhengshu[i].equals("0")) { System.out.print(num[nums]); tmp++; } else { System.out.print(num[nums] + unit[3 - tmp]); tmp++; } } System.out.print("元"); tmp = 0; } else if (zhengshu.length <= 4) { for (int i = 0; i < zhengshu.length; i++) { int nums = Integer.parseInt(zhengshu[i]); if ( i + 1 < zhengshu.length && zhengshu[i].equals("0") && zhengshu[i + 1].equals("0")) { continue; } if (i == zhengshu.length-1 && zhengshu[zhengshu.length-1].equals("0")){ break; } if (zhengshu[i].equals("0")) { System.out.print(num[nums]); } else { System.out.print(num[nums] + unit[zhengshu.length - 1 - i]); } } System.out.print("元"); } } }