https://leetcode.com/problems/reverse-string/description/
代码：
class Solution {
public String reverseString(String s) {
/****第一种方法用StringBuilder****/
// StringBuilder str = new StringBuilder(s);
// return str.reverse().toString();
/第二种方法用toCharArray和new String 转字符串和字符数组*/
char[] c = s.toCharArray();
int len = s.length();
int start = 0, end = len - 1;
while(start < end){
char temp = c[start];
c[start] = c[end];
c[end] = temp;
start++;
end--;
}
return new String(c);
}
}
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本文标题：344. Reverse String
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