collections

问题 Hey i am using brooklyn theme in my shopify website. I have different products will color variants . When i click on collection page i want to show all color variants of that products as separate products. I am googling since last night any help please. 回答1: Look at the codes below. <ul class="colorlist"> {% for option in product.options %} {% if option == 'Color' %} {% assign index = forloop.index0 %} {% assign colorlist = '' %} {% assign color = '' %} {% for variant in product.variants %} {

问题 When trying to adopt the style of implementing a listener using anonymous or nested class in order to hide the notification methods for other uses than listening (i.e. I don't want anybody to be able to call actionPerformed). For example from java action listener: implements vs anonymous class: public MyClass() { myButton.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e) { //doSomething } }); } The question is if theres an elegant way to remove the listener

问题 As an address of a variable (i.e. int a) in C can be obtained by &a . How can this be done in Java? For Eg. The elements of a linked list are non-contiguous. How can we print the address of the elements of a linked list created using the Collections Framework? If the above thing is not possible, how can we show that the elements of an array are contiguous whereas that of a linked list are not? 回答1: There is no element in the java language that allows you the get the address of anything and

问题 For a given type of Map , are there any guarantees that iterating over the Collection views returned by the keySet , values and entries methods are iterated in the same order? Background: I'm wondering whether transforming public static void doSomethingForEachEntry(Map<String, Integer> someMap) { for (String key : someMap.keySet()) { doSomething(someMap.get(key)); } } to public static void doSomethingForEachEntry(Map<String, Integer> someMap) { for (Integer value : someMap.values()) {

问题 This question already has answers here : Is List<Dog> a subclass of List<Animal>? Why are Java generics not implicitly polymorphic? (17 answers) Closed 3 years ago . I have tried both these pieces of code but I am getting errors for both. Attached below are both pieces and both errors that I am getting. I would appreciate any insight as to why this is happening. Example 1 static List<String> list = new ArrayList<String>(); public static void main(String[] args) { func(list); } private static

问题 Rich made vector, map, and set functions, while list, and sequence are not functions. Why cannot all these collections be function to make it consistent? Further, why don't we make all these compose data as a function which maps position to it's internal data? If we make all these compose data as function then there will be only function and atom data in clojure. This will minimize the fundamental elements in that language right? I believe a minimal, best only 2, set of fundamental elements

问题 Rich made vector, map, and set functions, while list, and sequence are not functions. Why cannot all these collections be function to make it consistent? Further, why don't we make all these compose data as a function which maps position to it's internal data? If we make all these compose data as function then there will be only function and atom data in clojure. This will minimize the fundamental elements in that language right? I believe a minimal, best only 2, set of fundamental elements

问题 I have this code: private void timer_Tick(object sender, EventArgs e) { timer.Stop(); for (int i = 0; i < TOTAL_SENSORS; i++) { DateTime d = DateTime.Now; devices[i].Value = float.Parse(serialPort.ReadLine()); if (chart1.Series[i].Points.Count > MAX_POINTS) { //see the most recent points } chart1.Series[i].Points.AddXY(d, devices[i].Value); } timer.Start(); } This part of my code is the timer's tick event where i draw a chart and i need to update it every tick.I keep adding points and when

问题 The multiple answers to question "Multi value Dictionary" propose to use an immutable class as TValue in Dictionary<TKey, TValue> Class. The accepted Jon Skeet's answer proposes a class Pair with readonly properties and @teedyay's answer to use the immutable Tuple. What is the rationale (or the possible benefits) of such approaches? And collateral question: Why to make TFirst and TSecond readonly if the respective properties First and Second do not have setters anyway: private readonly TFirst

问题 The multiple answers to question "Multi value Dictionary" propose to use an immutable class as TValue in Dictionary<TKey, TValue> Class. The accepted Jon Skeet's answer proposes a class Pair with readonly properties and @teedyay's answer to use the immutable Tuple. What is the rationale (or the possible benefits) of such approaches? And collateral question: Why to make TFirst and TSecond readonly if the respective properties First and Second do not have setters anyway: private readonly TFirst