字符串转换为货币金额大写格式，请大家指教一下

[「已注销」]

import java.text.DecimalFormat;
import java.util.Scanner;

public class Test080{
	private final static String[] STR_NUMBER={"零","壹","贰","叁","肆","伍","陆","柒","捌","玖"};
	private final static String[] STR_UNIT={"","拾","佰","仟","万","拾","佰","仟","亿","拾","佰","仟"};
	private final static String[] STR_UNIT2={"厘","分","角"};
	
	public static void main(String[] args)
	{
		Scanner in=new Scanner(System.in);
		System.out.println("请输入一个金额：");
		String convert=convert(in.nextDouble());
		System.out.println(convert);
	}
	
	public static String getInteger(String num)
	{
		if(num.indexOf(".")!=-1)
		{
			num=num.substring(0,num.indexOf("."));
		}
		num=new StringBuffer(num).reverse().toString();
		StringBuffer temp=new StringBuffer();
		for(int i=0;i<num.length();i++)
		{
			temp.append(STR_UNIT[i]);
			temp.append(STR_NUMBER[num.charAt(i)-48]);
		}
		num=temp.reverse().toString();
		num = numReplace(num, "零拾", "零");
		num = numReplace(num, "零佰", "零"); 
        num = numReplace(num, "零仟", "零"); 
        num = numReplace(num, "零万", "万"); 
        num = numReplace(num, "零亿", "亿"); 
        num = numReplace(num, "零零", "零"); 
        num = numReplace(num, "亿万", "亿");
        if(num.lastIndexOf("零")==num.length()-1)
        {
        	num=num.substring(0,num.length()-1);
        }
        return num;
	}
	
	public static String getDecimal(String num)
	{
		if(num.indexOf(".")==-1)
		{
			return "";
		}
		num=num.substring(num.indexOf(".")+1);
		num=new StringBuffer(num).reverse().toString();
		StringBuffer temp=new StringBuffer();
		for(int i=0;i<num.length();i++)
		{
			temp.append(STR_UNIT2[i]);
			temp.append(STR_NUMBER[num.charAt(i)-48]);
		}
		num=temp.reverse().toString();
        num = numReplace(num, "零角", "零"); 
        num = numReplace(num, "零分", "零"); 
        num = numReplace(num, "零厘", "零");
        num = numReplace(num, "零零", "零");
        
        if(num.lastIndexOf("零")==num.length()-1)
        {
        	num=num.substring(0,num.length()-1);
        }
        return num;
	}
	
	public static String numReplace(String num,String oldStr,String newStr)
	{
		while(true)
		{
			if(num.indexOf(oldStr)==-1)
			{
				break;
			}
			num=num.replaceAll(oldStr, newStr);
		}
		return num;
	}
	
	public static String convert(double d)
	{
		DecimalFormat df=new DecimalFormat("#0.###");
		String strNum=df.format(d);
		if(strNum.indexOf(".")!=-1)
		{
			String num=strNum.substring(0,strNum.indexOf("."));
			if(num.length()>12)
			{
				System.out.println("数字太大，不能完成转换");
				return "";
			}
		}
		String point="";
		if(strNum.indexOf(".")!=-1)
		{
			point="元";
		}
		else
		{
			point="元整";
		}
		
		String result=getInteger(strNum)+point+getDecimal(strNum);
		if(result.startsWith("元"))
		{
			result=result.substring(1,result.length());
		}
		return result;
	}
}

在代码中，temp.append(STR_NUMBER[num.charAt(i)-48])，索引为什么要减去48，不减的话，运行会报错。

[gukuitian]

0--9的ascii为 48--57 这里减48就是把字符转换成对应的索引位