hashmap

问题 I'm working with JSF 2.2.9, i have the following dataTable and buttons: <h:commandButton id="commandButtonRemoverSelected" actionListener="#{managedBeanName.removeSelected()}" class="btn btn-primary" value="Sim"> </h:commandButton> <h:dataTable var="bean" value="#{managedBeanName.beans}" styleClass="table table-hover" binding="#{managedBeanName.dataTable}"> <h:column headerClass="smallColumn"> <f:facet name="header"> <h:selectBooleanCheckbox valueChangeListener="#{managedBeanName.selectAll}">

问题 I wrote below code to retrieve values in hashmap. But it didnt work. HashMap<String, String> facilities = new HashMap<String, String>(); Iterator i = facilities.entrySet().iterator(); while(i.hasNext()) { String key = i.next().toString(); String value = i.next().toString(); System.out.println(key + " " + value); } I modified the code to include SET class and it worked fine. Set s= facilities.entrySet(); Iterator it = facilities.entrySet().iterator(); while(it.hasNext()) { System.out.println

问题 I have this map that has another HashMap inside it. How can I sum the values of the inner maps and compare them ? Also the maps size changeable. So I'm looking for a solution that works every size of the maps. {Team2={Alex=0, Tom=20}, Team1={John=0, Ammy=9, Monica=1}, Team3{...}, ...} values of teams --> {Alex=0, Tom=20}, {John=0, Ammy=9, Monica=1} ... values of these values is --> {0,20}, {0,9,1}... I just want to sum this values and find the biggest one. for(int i = 0 ; i < teamNameList

问题 This question already has answers here : How can I sort a Map according to the parameters of its values? [duplicate] (3 answers) Closed 3 years ago . I'm using the solution from this question to sort the String values in a LinkedHashMap . However the sorting simply doesn't work. Here is the code I wrote. Map<Integer, String> sortedMap = myMap.entrySet().stream() .sorted(Map.Entry.comparingByValue()) .collect(Collectors.toMap(Map.Entry<Integer, String>::getKey, Map.Entry<Integer, String>:

问题 While having a look inside HashMap class, I came across this method :- /** * This method is invoked whenever the value in an entry is * overwritten by an invocation of put(k,v) for a key k that's already * in the HashMap. */ void recordAccess(HashMap<K,V> m) { } Actually, this method is defined inside the inner class of Entry<K, V> I'm not able to make out of that comment. What does this method do ? PS : I can also see this method being called inside's HashMap's putForNullKey() method private

问题 I've been given a test-driven development problem (I need to make it work based on the junit methods provided) based on implementing a HashMap that uses a strings for the keys and ArrayLists for the values. The key needs to be able to support one or more corresponding values. I need to set up my methods in a way that I can add or subtract values from the hash, and then see the updated contents of the hash. My struggle is taking info provided from the unit method shown below (exercising

问题 This is a continuance from a SO Q here but I am still missing something. I dont know how to get a item that was mapped out from a JSONObject for a list view. The HashMap key value is: map.put(TAG_RES_FILE, resFile); And I would like to put that String into my onItemClick(){int passResFile = getResources().getIdentifier(TAG_RES_FILE, "raw", "com.andaero.app");} I thought by putting the tag name in the method below, the system would automatically pull it from that item position - obviously not.

问题 I have intialized Hash map inside static block, I need to access the hashmap object to get the value using key it inside my getExpo method. My class goes here public class ExampleFactory { static { HashMap<String,Class<?>> hmap = new HashMap<String,Class<?>>(); hmap.put("app", application.class); hmap.put("expo", expession.class); } public void getExpo(String key,String expression) { // I need to access the object in static block Class aclass=hmap.get(key); // it works when i place it inside

问题 I am using dynamic mapping in ElasticSearch. I use it because my index is long and I need to use the template feature in order to avoid updating definitions in multiple places (see my other SO question). I am sending the following json (Object Zoo) which contains a HashMap as an example: Put 127.0.0.1:9200/myIndex/Zoo/10 { "id" : 1, "Name" : "Madagascar", "map" : { "1" : { "id" : -4944060986111146989, "name" : null }, "2" : { "id" : 5073063561743125202, "name" : null }, "3" : { "id" :

问题 I have different structs which all contain a HashMap with String as the key, but with different value types. For example, one struct has a member of type HashMap<String, String> , the other will have a member of type HashMap<String, u8> , and so on. I want to define a method that can access these HashMap members and do generic actions on them that don't involve the value. For example, I want to count the number of keys, remove a key, check if a key exists, etc. I'm not sure how to implement