Tutorial: 344. Reverse String

题目

将输入的字符串反过来，再输出

算法

1. 新建一个StringBuilder
2. 把原来的字符串里面的字（char），倒着用charAt（）方法倒着读出来，添加到这个StringBuilder
3. 把这个StringBuilder用toString（）方法转成字符串

代码

private String reverseString(String s){    StringBuilder sb=new StringBuilder();    for(int i=s.length()-1;i>=0;i--) {        sb.append(s.charAt(i));    }    return sb.toString();}

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