重排数字的最小值

import java.util.Arrays;

/**
 * @author yagol
 * @date 上午10:43
 * @desc the description of this class
 **/
class Solution6001 {
    public static void main(String[] args) {
        System.out.println(new Solution6001().smallestNumber(-1));
    }

    public long smallestNumber(long num) {
        if (num == 0) {
            return 0;
        }
        String str = String.valueOf(num);
        if (num < 0) {
            str = str.replace("-", "");
        }
        char[] data = str.toCharArray();
        Arrays.sort(data);
        String newstr = "";
        String countzero = "";
        for (int i = 0; i < data.length; i++) {
            if (num < 0) {
                newstr += data[data.length - 1 - i];
            } else {
                if (data[i] == '0') {
                    countzero += "0";
                    continue;
                }
                newstr += data[i];
            }

        }
        if (num < 0) {
            System.out.println(newstr);
            return Long.parseLong("-" + newstr);
        }
        newstr = newstr.charAt(0) + countzero + newstr.substring(1);
        return Long.parseLong(newstr);
    }
}