https://leetcode-/problems/string-to-integer-atoi/

解决方案

class Solution {public int myAtoi(String s) {s = s.trim();long num = 0;for (int i = (s.startsWith("-") || s.startsWith("+")) ? 1 : 0;i < s.length()&& s.charAt(i) >= '0' && s.charAt(i) <= '9'&& num >= Integer.MIN_VALUE && num <= Integer.MAX_VALUE; i++) {num = num * 10 + (s.charAt(i) - '0');}num = s.startsWith("-") ? -num : num;if (num < Integer.MIN_VALUE) {return Integer.MIN_VALUE;} else if (num > Integer.MAX_VALUE) {return Integer.MAX_VALUE;} else {return (int) num;}}}