问题描述：

从键盘输入数字金额值,调用自定义方法String convertToString(int money) 获取该整数对应的中文金额值.
如:
12345 壹万贰仟叁佰肆拾伍圆

提示:
使用数组unit存放单位 [“圆”,”拾”,…]
使用数组big 存放大写数字 [“零”,”壹”,”贰”,…]
可借助StringBuffer类

package com.exercise2_3;

import java.util.Scanner;

public class Test {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.print("请输入金额：");
		int money = sc.nextInt();
		System.out.print("大写金额为："+convertToString(money));
	}
	
	public static String convertToString(int money) {
		StringBuffer str = new StringBuffer();
		String[] unit = {"圆","拾","佰","仟","万","拾万","百万","仟万","亿"};
		String[] big = {"零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"};
		String money_str = String.valueOf(money);
		for(int i = 0; i <money_str.length(); i++) {
			char ch = money_str.charAt(i);
			str.append(big[ch-48]);
			str.append(unit[money_str.length()-i-1]);
		}
		return str.toString();
	}
}