题解 | #找出字符串中第一个不重复的元素下标#
第一个只出现一次的字符
http://www.nowcoder.com/practice/1c82e8cf713b4bbeb2a5b31cf5b0417c
import java.util.HashMap; public class Solution { public int FirstNotRepeatingChar(String str) {
HashMap<Character,Boolean> hash = new HashMap<>();
char[] ch = str.toCharArray();
int size = ch.length;
for(char c : ch){
hash.put(c,!hash.containsKey(c));
}
int result = -1;
for(int i = 0;i < size;i ++){
if(hash.get(ch[i])) {
result = i;
break;
}
}
return result;
}
}