将字母转换为数字 [英] Converting Letters to Numbers

问题描述

假设我有一个程序将字母转换为数字，以便：

Let's say I have a program which converts letters to numbers such that:

输入：abcd

输出：1234

1. 如何有效地将abcd转换为1234


2. 我如何提取每一个来自令牌的个人字符

顺便说一句，这不是作业。 （这很有趣）

By the way, this is not homework. (this is for fun)

这是我到目前为止：

public class Test {
public static void main(String[] args) throws IOException  {

    BufferedReader f = new BufferedReader(new FileReader("test.in"));

    PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("test.out.txt")));

    StringTokenizer st = new StringTokenizer(f.readLine());

    int i1 = Integer.parseInt(st.nextToken());

            // How can I convert this into integers? (where a = 1, b = 2, and c = 3)

            out.println(????);

        out.close();
        System.exit(0);                              

    }

}

推荐答案

试试这个：

String s = "abcd";
StringBuilder sb = new StringBuilder();
for (char c : s.toCharArray()) {
    sb.append((char)(c - 'a' + 1));
}
// provided your string contains only lower case non-unicode (ASCII) characters.

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