反转字符串-入门
反转字符串
http://www.nowcoder.com/questionTerminal/c3a6afee325e472386a1c4eb1ef987f3
if(str == null || str.length()==0) return "";
char[] ans = str.toCharArray();
int len = str.length();
for(int i = 0 ; i < len ;i++)
{
ans[i] = str.charAt(len-1-i);
}
return new String(ans);
} 
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