迅雷笔试题试做

 

/**
 * 假如有字符串“6sabcsssfsfs33” ，用最有快速的方法去掉字符“ab3”，

 * 不能用java内置字符串方法（indeOf,substring,replaceAll等）
 *
 * @author chouy
 */
public class XunLeiExam1
{
    public static void main(String[] args)
    {
        String str1 = "6sabcsssfsfs33";
        String str2 = "ab3";
        System.out.println(replaceString(str1, str2));
    }
    
    public static String replaceString(String des, String reg)
    {
        StringBuilder buf = new StringBuilder(des.length());
        char[] chars = des.toCharArray();
        char[] regchars = reg.toCharArray();
        for (char c : chars)
        {
            boolean b = true;
            for (char regchar : regchars)
            {
                if (c == regchar)
                {
                    b = false;
                    break;
                }
            }
            if (b)
                buf.append(c);
        }
        return buf.toString();
    }
}