截取字符串（去掉前n个字符）

 

public static String truncateHeadString(String origin, int count) {
    if (origin == null || origin.length() < count) {
        return null;
    }
    char[] arr = origin.toCharArray();
    char[] ret = new char[arr.length - count];
    for (int i = 0; i < ret.length; i++) {
        ret[i] = arr[i + count];
    }
    return String.copyValueOf(ret);
}

参数含义：

        origin：要操作的字符串

        count：去掉字符串的数量