hashmap

print key/value in thymeleaf from hashmap/arraylist

蓝咒 提交于 2019-12-11 08:11:18
问题 The code in java/springboot: @RequestMapping(value = "results") public String results( Model model, @RequestParam String searchType, @RequestParam String searchTerm) { model.addAttribute("columns", ListController.columnChoices); ArrayList<HashMap<String, String>> jobsbyval = JobData .findforValue(searchTerm); model.addAttribute("items", jobsbyval); return "search"; } The code in html/thymeleaf: <div> <table> <tbody> <tr th:each="item : ${items}"> <!--each loop begins --> <td th:text="${item}"

hashmap

心不动则不痛 提交于 2019-12-11 08:11:09
# 初始化amap表, 把列表num_buckets添加到amap中,num_buckets用来存hashmap里设置的内容def new(num_buckets=256): amap = [] for i in range(num_buckets): amap.append([]) return amap# 利用求余来获得一个放置key的位置, hash函数用来获取一个数字或字符串的哈希值, 值为整数def hash_key(amap, key): return hash(key) % len(amap)# 通过bucket_id获取bucketdef get_bucket(amap, key): bucket_id = hash_key(amap, key) return amap[bucket_id]# 使用enumerate()和for循环遍历bucket, 用key获取索引, 键, 值def get_slot(amap, key, default=None): bucket = get_bucket(amap, key) for i, kv in enumerate(bucket): k, v = kv if key == k: return i, k, v return -1, key, default# 取值def get(amap, key, value): i,

HashMap overridden by last value

六眼飞鱼酱① 提交于 2019-12-11 07:49:21
问题 Statement selectStatement = connection.createStatement(); ResultSet selectResultSet = selectStatement.executeQuery(query); logger.info("sql query " + selectStatement.toString()); ResultSetMetaData rsmd = selectResultSet.getMetaData(); int columnsNumber = rsmd.getColumnCount(); String[] row = new String[columnsNumber]; int ctr = 0; logger.info("Reading from database..."); while(selectResultSet.next()) { for(int i=0;i<columnsNumber;i++){ row[i] = selectResultSet.getString(i+1); } System.out

年底面试了几家互联网公司

荒凉一梦 提交于 2019-12-11 07:45:33
坐标北京,Java后端开发,16年7月毕业的,毕业快3年半了,一直都在小公司待,感觉对自己未来职业发展不太有利,所以萌发了想要跳槽的冲动。2019年年底面试了很多家公司,如下: 中公教育 去了之后就是2道面试题,对一个List集合对象进行分组;第二道题就是写2个SQL,分组排序和行列转换(用到了case when )。之后就是问项目,问MQ如何保证幂等性,项目中用到了微服务的那些技术等等吧。由于没太准备好,一面就挂了。 尚德机构 一面问到了项目,线程池,hibernate和mybatis的区别,springMVC的运行流程,HashMap吧,最后让写了一个快排 完美世界(公司内部系统开发的招聘) 去做一个公司的内部管理系统,聊了一下,公司用到的技术都比较陈旧,数据库用的oracle,开发,测试,运维上线全部都由开发来搞,不太想去 今日头条 周日去的,他们是单双周,去了之后就是3道算法题,3选一,给你一台笔记本,45分钟;第一道是蛇形打印二叉树,之前在LeetCode上做过,很快就写出来了。之后就是一面,一开始给面试官讲了讲我写的算法题,不知道什么原因,花了20分钟左右讲了一下;之后就是自我介绍,项目介绍,然后开始问基础,hashmap,nginx反向代理和正向代理的区别,MySQL事务的隔离级别,没答上来,之后又问了spring的隔离级别,还是不知道,没复习到这一块

Construct chain of links from list

浪尽此生 提交于 2019-12-11 07:34:37
问题 I have a list of key/value pairs and I need to detect chains in the list where the value matches a key. E.g. from the below there could be 12, 23, 34 or 62, 23, 34 Key Value 1 2 3 4 2 3 6 2 More than one value can be pointing to the same key but I need to store different 'chains' for each unique start and end point. The list could be in any order. I'm using Java but am I bit stuck on how to tackle this problem. Please help! 回答1: Recursion! import java.util.HashMap; import java.util.Map;

JDO - HashMap within an embedded Class

旧时模样 提交于 2019-12-11 07:03:15
问题 Are you able to store a HashMap within an embedded class on App Engine? I have the following Class: @Persistent(serialized = "true") @Embedded private Stats stats; @PersistenceCapable @EmbeddedOnly public static class Stats implements Serializable { private static final long serialVersionUID = 1L; @Persistent(serialized = "true", defaultFetchGroup="true") private Map<String, Integer> requests; public Stats() { requests = new HashMap<String, Integer>(); } } However, when I attempt to add an

Json with java hashmap

不羁的心 提交于 2019-12-11 07:02:56
问题 I have hashmap object, Map testData=new HashMap(); testData.put("test","test1"); I am able to convert this map using json file with Gson library. I know how to get that data using jQuery getJSON. My question is: how to display both key and value pairs? 回答1: What about using gson on the server side, and use jQuery's .getJSON on the client-side? EDIT: added a for-each example according to your changed question, try it here: http://jsfiddle.net/5gEYf/ var response = {"test": "test1"}; $.each

Null check in map gets null pointer exception

时光怂恿深爱的人放手 提交于 2019-12-11 06:53:18
问题 I am trying to use a Java HashMap . Using map.get("A") to get a value for a key from the map resulted in a NullPointerException . Then I used if(map.get("A")) to avoid a NullPointerException being thrown, but it gets thrown anyway. What am I doing wrong? 回答1: I have answering my own question. I have used to check if(map.containsKey("A")) String b = map.get("A") rather than if(map.get("A") != null) map.get("A") It will help me to avoid null pointer exception 回答2: Well, you probably didn't

Java: HashMap.get returns null

独自空忆成欢 提交于 2019-12-11 06:44:24
问题 I am programming a socket server in Java for an MMORPG in AS3. I have some problems with strange behaviour of HashMap.get(byte[]). What things could cause the following problem? I don't use any serialization system, I send bytes and both client and server knows what to do with what bytes of the received bytes. The first request the client makes is asking the server to create a playing session. The server will generate a random session token as byte[] with 8 entries and adds the token to the

Same values with different keys in a hashmap

爱⌒轻易说出口 提交于 2019-12-11 06:37:44
问题 Initially I put two entries with the same value into a hashmap. The value of the two entries is itself a map. These entries have different keys. Now I want to put new values into the map (the value) of the first entry. The problem is that the map of the second entry (its value) is also changed as long as I change the first one. The two different keys somehow reference the same value (map). What should I do in order to edit the values of the initially identical values separately from each