collections

问题 In my unit test class, I am having two list. One is the expectedValue and other is returnedType . I am doing Collections.sort(expected); Collections.sort(returned); but how do I compare two list based on the type of value of one of its element? For example I have element sortOrder in both the list and it has values from 1,2 or 3 so how do i compare or say doing something like assertEqual(expected, returned) for both the list and make sure that both list has same elements and has same

问题 I needed to extend my question Map collection separate Object values Here is the code I'm working with cypher in java. I wrote a query (you can see it in the answer of my question Taxi sharing scheduling in neo4j thank you Brian for your help) after the query i wrote this code Result userData = graphDb.execute(query); ArrayList<Map<String, Object>> userNode = new ArrayList<>(); while(userData.hasNext()){ Map<String, Object> user = userData.next(); userNode.add(user); System.out.println("Key:

问题 I would like to know how to use Converters in Java Server Faces similar to Spring collection property editor Suppose the following model public class Group { private String name; List<User> users = new ArrayList<User>(); // getter's and setter's } And equivalent form <form ...> <h1>Group form</h1> <label for="name">Enter name</label> <input type="text" name="name"/> <label for="users">Select users</label> <!--value attribute stores userId--> <input type="checkbox" value="1" name="users"/>

问题 I have a collection that is binded to my Listview. I have provided options to user to "move up" "move down" the selected item in the list view. I have binded the selected item of the listview to my viewmodel, hence I get the item in the collection on which user want to do the operation. I have attached "move up" "move down" commands in my viewmodel. I want what is the best way to move up and down in the collection in the collection which is reflected in the list view. For example If the

问题 I am using ArrayList and I want an example of Exception in case if multiple threads try to access the same list without synchronization ? I done this in single threaded application in which if we remove an element from list while iteration it throws ConcurrentModificationExceptoin but I want to achieve the same in multi threaded environment. If anyone could give me an example of that would be highly appreciated ? package com.test2; public class ThreadTest extends Thread { List list = new

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: How to count occurrence of an element in a List Count occurences of word in ArrayList Assume I have a List the following values emp1, emp2, emp3, emp2, emp1, emp4, emp1 I need to get the number of times a string is repeated such as the following emp1 - 3 times emp2 - 2 times emp3 - 1 times emp4 - 1 times I am trying to implement this by using map. Is this the correct way or is there any better way? 回答1: You can

问题 I want to make a binding to a specific element in the Collection . But I cannot figure out how to write the Binding. This is the code: public class MySource { .. public string SomeProp; public ICollection<T> MyCollection; .. } this.DataContext = new MySource(); <TextBox Text={Binding SomeProp} /> <TextBox Text={Binding FIRST_ELEMENT_OF_THE_MyCollection} /> <TextBox Text={Binding SECOND_ELEMENT_OF_THE_MyCollection} /> <!--Ignore other elements--> Try to replace those binding strings, please

问题 I'm trying to use a custom collection to "connect" (or relate) two classes but I haven't been able to do it. Maybe I got the whole concept of the SqlAlchemy custom collections wrong, but let me explain what I am doing (and see if someone can give me a hint, or something) I have a Parent class (which some of you will remember from other questions) with a couple of connectors fields (kind of lists) in it. One of the connectors will store instances of a Child() class whose type is " VR " and the

问题 I have two copies of data, here 1 represents my volumes and 2 represent my issues. I have to compare COPY2 with COPY1 and find all the elements which are missing in COPY2 ( COPY1 will always be a superset and COPY2 can be equal or will always be a subset). Now, I have to get the missing volume and the issue in COPY2. Such that from the following figure(scenario) I get the result as : - Missing files – 1-C, 1-D, 2-C, 2-C, 3-A, 3-B, 4,E. Question- What data structure should I use to store the

问题 I am trying to sort a list against a custom order, I have already followed the stackOverflow link. The custom order must be as followed : "ST, SIT, JDC" which has been done with an array list in customOrder. and a data comming from database must be shown in a list following the above order, but the problem is that this is only work if the data from the database match exactly to this list, like if I have an exact word of "ST" or "SIT" then it do the job. but the data that I am getting from the