java面试题（一）字符串倒转输出

  public static String reverse(String s){
    
    
        int length = s.length();
        StringBuffer stringBuffer = new StringBuffer(length);
        for(int i=length-1;i>=0;i--){
    
    
            stringBuffer.append(s.charAt(i));
        }
        return stringBuffer.toString();
    }