wildcard | 易学教程

Why declare a variable as a wildcard type

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问题 In the Java tutorials, it is sometimes written things like this : Set<?> unknownSet = new HashSet<String>(); While I understand the benefits of using type parameters and wildcards in class definitions and methods, I am wondering the following: What are the benefits of giving a variable a type that comprises a wildcard ? In real life, do people do that, and when ? 回答1: Wildcards are only really useful in method parameter declarations, as they increase the range of acceptable parameter types,

Demystify Wildcard for me

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问题 Why do I get a compile time error on this piece of code? public Interface Location { ....... } Class code... Map<Type, List<? extends Location>> locationsTypeMap = new HashMap<Type, List<? extends Location>>(); /** Code to add elements to the hashMap. */ newLocation = getNewLocation() while(mapHasElements){ Location.Type key = location.getType(); List<? extends Location> valueList = (List<? extends Location>)locationsTypeMap.get(key); //1 valueList.add(newLocation);/*Compile error*/ } On the

Is it possible to configure redirection with wildcard for Firebase hosting so that the wildcard parameter is interpolated into string?

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问题 I'm looking for a way to configure a redirection in Firebase so that the "pretty" url like https://customdomainname.com/story/asdf is redirected to the real path in Firebase which is generated like https://firebasestorage.googleapis.com/v0/b/myprojectname-12345.appspot.com/o/stories%2Fasdf.m4a?alt=media&token=574e6dee-f289-468d-99ad-6e5d2ac8d6aa . For doing that I have connected a custom domain to firebase so that now I see both the default domain and the custom connected domain (probably I

Use wildcard in src attribute of <script> tag?

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问题 Ok, stupid question and I don't think it's possible but, I have this markup at the top of my .aspx page... <%--Third Party Libraries, Plugins, Extensions --%> <script src="Libraries/Raphael/Raphael.js" type="text/javascript"></script> <script src="AutoComplete/jquery.autocomplete.js" type="text/javascript"></script> <script src="Libraries/jQuery/1.4.2/jquery.js" type="text/javascript"></script> <script src="Libraries/jQuery/UI/1.8.4/jquery.ui.core.js" type="text/javascript"></script> <script

When does Firefox throw ssl_error_bad_cert_domain with a wildcard certificate?

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I've searched through https://developer.mozilla.org/en-US/ and Google and still cannot learn exactly why Firefox would display it's "This Connection is Untrusted" screen/UI with "(Error code: ssl_error_bad_cert_domain)" under "Technical Details". Is it really as simple as "The SSL certificate common name does not match the fully qualified domain name (FQDN) of the webserver/website." ? If so, then why wouldn't an SSL certificate with the common name "*.subdomain.mydomain.tld" work with the website " https://subdomain.mydomain.tld " and throw this specific error? If so, then why wouldn't an SSL

Wildcard and Fuzzy query together in elastic search

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问题 I am trying to design a query in which, I can use wildcard and Fuzzy query together. According to me, query_string is used for wildcard searches and multi_match can be used for fuzziness. I want a query which will search on words :- "elast" : - provide results elastic and elasticsearch. "elasttc" :- also provide results as elastic and elasticsearch. Elastic search supports wildcard and fuzzy query together?? Thanks in advance... 回答1: { "query": { "bool": { "should": [ { "match": { "title":

How to use LIKE statement in sql plus with multiple wild carded values?

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my question is that currently if i want to query for multiple wildcarded values. I need to do something like this. select customername from customers where customername like '%smith' or customername like '%potter' or customer name like '%harris' or customername like '%williams'; So I wanna ask from the experts, is there any easier way to do this? Regards, Sanjan Create a table of your 100 names select customername from customers c inner join customersames cn on(c.customernamename like '%'+cn.searchForname) Can be a table variable if that helps. you can use regular expressions EDIT: You can

Batch to delete all files in a folder with a wildcard in the path

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问题 So what I'm trying to do is go into every folder in the following directory "C:\Documents and Settings\" and for every folder in it, regardless of the name, check if this path exists "C:\Documents and Settings\*\Local Settings\Application Data\CSMRpt\" if it exists then delete all txt files inside that director, if the path doesn't exists then do nothing and move on to the next folder inside "C:\Documents and Settings\" This is what I came up with so far: set PATH = "\Local Settings

Generics and wildcards in Java [duplicate]

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This question already has answers here : Is List<Dog> a subclass of List<Animal>? Why are Java generics not implicitly polymorphic? (17 answers) Closed 12 months ago . I have recently taken on a Java course about generics and wildcards. I am not able to grasp the difference between them and, sometimes, even the need to use them. Two questions, please: 1) An order has a list of products, and we have sheets and clips as products. public class Product {} public class Sheet extends Product{} public class Clip extends Product{} public class Order { //isn't this: private List<Product> products; /

mysql detail query string, like wildcard

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Not sure how to title my question... lol. Below is what i am needing. Values in my database look like the following: test_example-1, test_example-2, test_example-TD-1 The values can vary in length, "test_example-" is just an example, some of the values will have varying names. When i perform a query to grab all the values that look like this "test_example-" i get everything, because i am using the wild card value this way "test_example-%". However, i do not want the "test_example-TD-1" in the result. I only want the NON-TD values. So, how can i get all the "test_example-" without getting stuff