leetcode 6047. 移除指定数字得到的最大结果 java

class Solution {
    public String removeDigit(String number, char digit) {
        String max="";//最小
        StringBuilder sb;
        for(int i=0;i<number.length();i++){
            char c=number.charAt(i);
            if(c==digit){
                sb=new StringBuilder(number);
                String tmp=sb.deleteCharAt(i).toString();
                if(tmp.compareTo(max)>=0){
                    max=tmp;
                }
            }
        }
        return max;
    }
}