替代 switch -- 替换字符 [英] Alternative to switch -- replacing characters

问题描述

我被要求为课程编写一个程序:

I was required to write a program for class which:

1. 接受 .txt 文件
2. 将文件中的数字 0-9 转换为对应的文本(如果数字在句首，请使用大写)
3. 将完成的句子打印到新文件中

示例:

The 8 eggs were separated into 3 groups.

将转换为:

The eight eggs were separated into three groups.

<小时>

目前我正在使用带有 StringBuilder 的(非常)长的 switch 语句来完成任务:

---

Currently I am using a (very) long switch statement with a StringBuilder to complete the task:

switch(sb.charAt(i)){
        case '0':
            if (i == 0)
                sb.replace(i, i+1, "Zero");
            else
                sb.replace(i, i+1, "zero");
            break;
        case '1':
            if (i == 0)
                sb.replace(i, i+1, "One");
            else
                sb.replace(i, i+1, "one");
            break;
        ..... 
}

有更高级/更有效的方法来完成这项任务吗?

There is a more advanced/efficient way to accomplish this task?

推荐答案

可能您正在寻找 HashMap.这可以帮助:

Probably you're looking for HashMap. This can help:

1. 创建静态HashMapDIGITS 并使用 put("0", "zero");把(1"，一")；//etc.. 初始化它.
2. 使用string.split(" ")分割你的输入字符串；这将创建一个像这样的字符串数组:{"The","8","eggs",...}.

3. 使用 StringBuilder 构建答案:

1. Create static HashMap<String, String> DIGITS and use put("0", "zero"); put("1", "one"); //etc.. to initialize it.
2. Split your input string using string.split(" "); this will create an array of strings like this: {"The","8","eggs",...}.

3. Use StringBuilder to build an answer:

for (String s : splitted) {
    if (DIGITS.contains(s))
        sb.append(DIGITS.get(s));
    else
        sb.append(s);
    sb.append(' ');
}

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