linkedhashmap

The error looks like this Exception in thread "Thread-1" java.lang.NullPointerException at java.util.LinkedHashMap$Entry.remove(LinkedHashMap.java:332) at java.util.LinkedHashMap$Entry.recordAccess(LinkedHashMap.java:356) at java.util.LinkedHashMap.get(LinkedHashMap.java:304) at Server.getLastFinishedCommands(Server.java:9086) at Server.processPacket(Server.java:484) at PacketWorker.run(PacketWorker.java:34) at java.lang.Thread.run(Thread.java:744) Inside getLastFinishedCommands I use public List<CCommand> getLastFinishedCommands(UserProfile player) { List<CCommand> returnList = new ArrayList

本文内容： LinkedHashMap概述 LinkedHashMap源码分析 LinkedHashMap概述 LinkedHashMap类似 于HashMap，区别在于采用迭代器迭代每个元素时，其顺序是按照插入次序或者是LRU次序。 其继承 关系如下： LinkedHashMap直接继承了HashMap，实现了Map接口。 LinkedHashMap用Hash存储所有元素，但迭代时却又可以按顺序遍历，这是如何做到的呢？ LinkedHashMap源码分析 看一下LinkedHashMap的属性 /** * The head of the doubly linked list. */ private transient Entry<K,V> header; /** * The iteration ordering method for this linked hash map: <tt>true</tt> * for access-order, <tt>false</tt> for insertion-order. * * @serial */ private final boolean accessOrder; 其中header列表记录着元素的插入或者LRU次序，所以很明显，LinkedHashMap能够迭代器顺序访问一定和这个header有关。其实确实是的

I'm attempting to pass a serialized LinkedHashMap between activities, and getting a confusing result/error when I deserialize the object. I serialize the object as follows: Bundle exDetails = new Bundle(); LinkedHashMap<String, Exercise> exMap = new LinkedHashMap<String, Exercise (workout.getExercises()); exDetails.putString(WORKOUTNAME, workout.getWorkoutName()); exDetails.putSerializable(workout.getWorkoutName(), exMap); iComplete.putExtra("wName", exDetails); startActivity(iComplete); That seems to work fine, the problem shows up in the next activity: Bundle exDetails = getIntent()

I have a response coming from a web service, data is in JSON form. JSONObject event:- { "15:00":{"type":1,"status":null,"appointment_id":null}, "16:00":{"type":1,"status":null,"appointment_id":null}, "17:00":{"type":1,"status":null,"appointment_id":null}, "18:00":{"type":1,"status":"1","appointment_id":5} } I don't know the key values, they are random. So when i iterate the data using iterator by fetching keys and hasNext() . It returns the data but changes the order of coming data. Iterator AppoinmentIter = event.keys(); while(AppoinmentIter.hasNext()){ String appointmentTime = (String

I use the following lines to sort a LinkedHashMap, but not all items are sorted, anything wrong ? LinkedHashMap<String,PatternData> statisticsMap; // fill in the map ... LinkedHashMap<String,PatternData> sortedStatisticsMap=new LinkedHashMap<String,PatternData>(); // Sort it by patternData's average ArrayList<PatternData> statisticsMapValues=new ArrayList<PatternData>(statisticsMap.values()); Collections.sort(statisticsMapValues,Collections.reverseOrder()); // Sorting it (in reverse order) patternData last_i=null; for (PatternData i : statisticsMapValues) // Now, for each value { if (last_i==i

So i want to pass a LinkedHashMap to an intent. //SEND THE MAP Intent singlechannel = new Intent(getBaseContext(),singlechannel.class); singlechannel.putExtra("db",shows1);//perase to startActivity(singlechannel); //GET THE MAP LinkedHashMap<String,String> db = new LinkedHashMap<String,String>(); db=(LinkedHashMap<String,String>) getIntent().getSerializableExtra("db"); This one Worked Like a charm with HashMap. But with LinkedHashMap i got a problem i got a runtime error here db=(LinkedHashMap<String,String>) getIntent().getSerializableExtra("db"); I get no error with HashMap. I also got a

I'm creating a very simple form validation utility for a sign up screen, and I'm running into some unexpected behavior concerning LinkedHashMap and a stream created from its entrySet . I'm storing validation results in a LinkedHashMap , with the following ordering of statements: Map<ValidationResult.SignUpField, Boolean> fieldStatuses = new LinkedHashMap<>(); fieldStatuses.put(EMAIL, isValidEmail(emailAddress)); fieldStatuses.put(USERNAME, isValidUsername(username)); fieldStatuses.put(BIRTHDAY, isValidBirthday(birthday)); fieldStatuses.put(PASSWORD, isValidPassword(password)); fieldStatuses