map

问题 Some piece of code: public class Player { Team team; String name; } public class Team { List<Player> players; } public class Demo { @Inject TeamDAO teamDAO; @Inject PlayerDAO playerDAO; List<String> findTeamMatesNames(String playerName) { Optional<Player> player = Optional.ofNullable(playerDAO.get(playerName)); return player.flatMap(p -> teamDAO.findPlayers(p.team)) .map(p -> p.name) .orElse(Collections.emptyList()); } } Why am I not able to do this? In flatMap method I am getting error "Type

问题 Is there anyway to create a map data structure in pl/sql. 回答1: There is the PL/SQL associative array DECLARE TYPE salary_tab_t IS TABLE OF NUMBER INDEX BY VARCHAR2(30); salary_tab salary_tab_t; BEGIN salary_tab('JONES') := 10000; salary_tab('SMITH') := 12000; salary_tab('BROWN') := 11000; END; You can loop through the elements like this: l_idx := salary_tab.FIRST; LOOP EXIT WHEN l_idx IS NULL; dbms_output.put_line (salary_tab(l_idx)); l_idx := salary_tab.NEXT(l_idx); END LOOP; 来源： https:/

来源： https://stackoverflow.com/questions/9278548/loading-a-map-in-pygame-python

来源： https://stackoverflow.com/questions/9278548/loading-a-map-in-pygame-python

来源： https://stackoverflow.com/questions/9278548/loading-a-map-in-pygame-python

来源： https://stackoverflow.com/questions/23893118/mapping-avro-models

来源： https://stackoverflow.com/questions/23893118/mapping-avro-models

问题 I have a structure like this: var myMap = { partnr1: ['modelA', 'modelB', 'modelC'], partnr2: ['modelA', 'modelB', 'modelC'] }; I am going to iterate through each of the elements (partnr) with their associatives (models). I am trying a double $each iteration in order to achieve this, but nothing happens: $.each(myMap, function (i, val) { $.each(i, function (innerKey, innerValue) { setTimeout(function () { $('#variant').fadeOut("slow", function () { $(this).text(innerKey + "-" + innerValue)

问题 I have a map: var sessions = map[string] chan int{} How do I delete sessions[key] ? I tried: sessions[key] = nil,false; That didn't work. Update (November 2011): The special syntax for deleting map entries is removed in Go version 1: Go 1 will remove the special map assignment and introduce a new built-in function, delete : delete(m, x) will delete the map entry retrieved by the expression m[x] . ... 回答1: Strangely enough, package main func main () { var sessions = map[string] chan int{};

问题 I have just started implementing data structures in Java and was wondering can we have a situation like this. Map<HashMap<String,String>,String> map = new HashMap<HashMap<String,String>,String>(); And if yes ,, please give a small example. If you don't found question relevant ,, please mention in comments, 回答1: You can do this, but you should not do so in most cases. The key to a map needs to be constant and its equals and hashcode need to be set up to give the correct behavior. If you modify