思路和具體方法都在注釋中說明

package ClassicArithmetic;import java.util.Scanner;/** @author:LOHAS翀* @time:2019/11/1* * 人民幣大小寫轉換（阿拉伯數字轉漢字）* 要求：* 1)輸入小寫數字金額，輸出大寫漢字金額* 2)最大單位支持到億，最小單位主持到分(即阿拉伯數字支持小數點后兩位)，超出范圍輸出錯誤提示* 3)對輸入進行校驗，不能出現運行錯誤* 4)符合人民幣金額格式，如：億/萬/元等前不可出現零等* */ public class UnitTranslate {//定義數字對應的漢字public final static String[] num = {"零", "壹", "貳", "叁", "肆", "伍", "陸", "柒", "捌", "玖"};//定義單位public final static String[] unit = {"", "拾", "佰", "仟"};public static void main(String[] args) {while (true) {try {System.out.println("請輸入數字：");Scanner sc = new Scanner(System.in);String input = sc.next();//對數字進行整數和小數的分隔String[] numString = input.split("\\.");//若是整數則將其轉換為有小數的數if (numString.length == 1) {input += ".0";numString = input.split("\\.");}//將整數進行分隔String[] zhengshu = numString[0].split("");//將數字前的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;}//對小數進行分隔String[] xiaoshu = numString[1].split("");//若格式不對則拋出異常if (xiaoshu.length > 2 || numString.length != 2 || zhengshu.lenth > 12) {throw new Exception();} else if (xiaoshu.length == 1 && xiaoshu[0].equals("0")) {//小數部分為0的情況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("輸入有誤");} catch (Exception e) {System.out.println("輸入有誤");}}}public static void printInfo(String[] zhengshu, String[] xiaoshu) {int tmp = 0; //該標志位用來記錄對unit的操作地址int zeroNum = 0; //記錄從右到左第5到第8位0的個數//數字為億級if (zhengshu.length > 8) {for (int i = 0; i < zhengshu.length - 8; i++) {int nums = Integer.parseInt(zhengshu[i]);//判斷相鄰是否為0if (zhengshu[i].equals("0") && zhengshu[i + 1].equals("0") && i + 1 < zhengshu.length - 8) {continue;}//若0在級的最后一位則不輸出if (i == zhengshu.length-8-1 &&zhengshu[zhengshu.length-8-1].equals("0")){break;}//若有相鄰的0則輸出最后一個0if (zhengshu[i].equals("0")) {System.out.print(num[nums]);} else {System.out.print(num[nums] + unit[zhengshu.length - 8 - 1 - i]);}}System.out.print("億");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("萬");}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) { //數字為萬級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("萬");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");}} }

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