Remove Comments - Facebook

https://gist.github.com/gcrfelix/65d5a028c655f1b86f41
http://www.1point3acres.com/bbs/thread-119657-1-1.html
Given a function that reads one line a time from a file and returns the line to you. The line contains comment sign as of "/* */" or even nested signs. Note the sign doesn't have to be paired in one single line. Write a function to append all these lines and return them as one single string without comments. 

解法：
1. flag 记录/*有没有开始， 如果没开始，但找到了/*，说明这行有comment, 把comment前的东西print出来
2. 如果这行还出现了*/, 说明comment的结尾也找到了，把结尾后面的代码print出来
3. 如果flag = true，没出现结尾，说明这行完全是comment(multiple lines), 跳过
4. 如果flag = false， 没出现开头，说明这行完全是代码，print出来。

public class remove_comments {

    public void remove() {
        boolean flag = false;
        Scanner sc = new Scanner(System.in);
        while (sc.hasNextLine()) {
            String s = sc.nextLine();
            if (flag == false && s.indexOf("/*") != -1) {
                flag = true;
                System.out.print(s.substring(0, s.indexOf("/*")));
            }
            if (flag == true && s.indexOf("*/") != -1) {
                flag = false;
                System.out.print(s.substring(s.indexOf("*/") + 2));
            }
            if (flag == true) {
                continue;
            }
            if (flag == false && s.indexOf("*/") == -1) {
                System.out.print(s);
            }
        }
        sc.close();
    }

}

问了一道怎么把钱的数字表达转换成string表达. CC150的原题