//题目，做一个输入金额数字，输出转换成中文的金额名称。

public class Test {

public static void main(String\[\] args) {  
    System.out.println("欢迎使用数字转换器(Designed by wujj)！！");  
    String in;  
    boolean isRunning = true;  
    Scanner scanner = new Scanner(System.in);  
    while (isRunning) {  
        System.out.println("请输入一串纯整数：");  
        in = scanner.next();  
        String input = in.trim();  
        if (!isNum(input)) {  
            System.out.println("输入类型错误！！！你应该输入12位以内纯正整数！！！");  
            continue;  
        } else {  
            System.out.println("转换成中文数字为：" + num2Ch(input));  
        }  
        System.out.println("是否继续查询？  1.是  2.不，谢谢");  
        int isContinue = scanner.nextInt();  
        if (isContinue == 1) {  
            continue;  
        } else if (isContinue == 2) {  
            System.out.println("程序结束！欢迎下次使用！！！");  
            isRunning = !isRunning;  
        } else {  
            System.out.println("指令输入错误，直接退出！！");  
            System.out.println("程序结束！欢迎下次使用！！！");  
            isRunning = !isRunning;  
        }  
    }  
    System.out.println("请输入任意数字退出控制台...");  
    in = scanner.next();  
    scanner.close();  
}  

private static String num2Ch(String input) {  
    input = Long.parseLong(input) + "";  
    if (input.equals("0")) {  
        return "零";  
    }  
    // int length = input.length();  
    // char\[\] arr1 = { 'O', '一', '二', '三', '四', '五', '六', '七', '八', '九', '十', '百',  
    // '千', '万', '亿' };  
    // char\[\] arr2 = { '零', '壹', '贰', '叁', '肆', '伍', '陆', '柒', '捌', '玖', '拾', '佰',  
    // '仟', '万', '亿' };  
    StringBuffer s = new StringBuffer();  
    switch (4 - (input.length() % 4)) {  
        case 1:  
            s = new StringBuffer("0").append(input);  
            break;  
        case 2:  
            s = new StringBuffer("00").append(input);  
            break;  
        case 3:  
            s = new StringBuffer("000").append(input);  
            break;  
        default:  
            s = new StringBuffer("").append(input);  
    }  
    String\[\] arr = new String\[s.length() / 4\];  
    for (int i = 0; i < s.length(); i = i + 4) {  
        if (i + 4 == s.length())  
            arr\[i / 4\] = s.toString().substring(i);  
        else  
            arr\[i / 4\] = s.toString().substring(i, i + 4);  
    }  
    StringBuffer output = new StringBuffer("");  
    switch (s.length() / 4) {  
        case 3:  
            output = output.append(trans(arr\[s.length() / 4 - 3\])).append("亿");  
        case 2:  
            if (Integer.parseInt(arr\[s.length() / 4 - 2\]) == 0 && Integer.parseInt(arr\[s.length() / 4 - 3\]) != 0)  
                output = output.append("零");  
            else  
                output = output.append(trans(arr\[s.length() / 4 - 2\])).append("万");  
        case 1:  
            output = output.append(trans(arr\[s.length() / 4 - 1\]));  
            break;  
    }  
    return output.toString();  
}  

// 四位数转换函数  
private static String trans(String string) {  
    String s = Integer.parseInt(string) + "";  
    StringBuffer output = new StringBuffer("");  
    String\[\] arr = { "", "一", "二", "三", "四", "五", "六", "七", "八", "九" };  
    // for (int i = 0; i < s.length(); i++) {  
    // if (s.charAt(i) != 0) {  
    // s = s.substring(i);  
    // break;  
    // }  
    // }  
    if ((Integer.parseInt(s) + "").equals("")) {  
        return "";  
    } else {  
        switch (s.length()) {  
            case 4:  
                if (Integer.parseInt(string.charAt(0) + "") == 0) {  
                    output = output.append("零");  
                }else {  
                    output = output.append(arr\[Integer.parseInt(s.charAt(0) + "")\]).append("千");  
                }  
            case 3:  
                if (Integer.parseInt(string.charAt(3) + "") != 0 && Integer.parseInt(string.charAt(1) + "") == 0 && Integer.parseInt(string.charAt(0) + "") != 0) {  
                    output = output.append("零");  
                }else {  
                    output = output.append(arr\[Integer.parseInt(string.charAt(1) + "")\]);  
                }  
                if (Integer.parseInt(string.charAt(1) + "") != 0) {  
                    output = output.append("百");  
                }  
            case 2:  
                if (Integer.parseInt(string.charAt(3) + "") != 0 && Integer.parseInt(string.charAt(2) + "") == 0 && Integer.parseInt(string.charAt(1) + "") != 0  
                        && Integer.parseInt(string.charAt(0) + "") != 0) {  
                    output = output.append("零");  
                }else{  
                    output = output.append(arr\[Integer.parseInt(string.charAt(2) + "")\]);  
                }  
                if (Integer.parseInt(string.charAt(2) + "") != 0) {  
                    output = output.append("十");  
                }  
            case 1:  
                if (Integer.parseInt(string.charAt(3) + "") != 0) {  
                    output = output.append(arr\[Integer.parseInt(string.charAt(3) + "")\]);  
                }  
                break;  
        }  
        return output.toString();  
    }  
}  

// 判断是否是纯数字输入  
private static boolean isNum(String s) {  
    String num = "0123456789";  
    int length = 0;  
    for (int i = 0; i < s.length(); i++) {  
        for (int j = 0; j < num.length(); j++) {  
            if (s.charAt(i) == num.charAt(j)) {  
                length++;  
                break;  
            }  
        }  
    }  
    return (s.trim().length() != 0 && length == s.length() && length <= 12 && length >= 0) ? true : false;  
}  

}