Java
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Java – how to create a new localdatetime with zero time zone?
new LocalDateTime(“1999-12-31T00：00：00Z”); When I try to create this date, I get: Exception in thread "main" java.la…… -
Java – you cannot set a custom dimension in Google Analytics properties of Android apps
Please find the tracking code below, GoogleAnalytics analytics = GoogleAnalytics. getInstance(this); Tracker t = analy…… -
Multithreading – Apache spark standalone mode: number of cores
I am trying to understand the basic knowledge inside spark and spark documents used to submit applications in local mo…… -
Java – multiple phrases in a pdfpcell
I want to add multiple phrases to a pdfpcell So, do this anyway? Please help. The code is like, PdfPCell cell = new Pd…… -
Data structure – hash table – implemented using binary search tree
From cracking the code interview, page 71: I know the basics of linked list, hash table and BST, but I can't understan…… -
Java uses regexp to split space?
I try to match and capture commands and parameters from the following inputs: !command param1 param2 I am using the Ja…… -
java – spring data redis master slave config
Here is my jedis configuration @Bean public JedisConnectionFactory getJedisConnectionFactory() { JedisConnectionFa…… -
Java – a common way to write duplicate arrays
For my programming task, I was asked to write a general copy method to copy from an array to an array of the same size…… -
How to split character vectors based on the length of the list
I have this character vector: a<-c("tanaman","cabai","banget","hama","sakit","tanaman","koramil","nogosari","melaks…… -
Java – the file was not found when trying to compile the telegraph source code
I'm trying to build an application like telegraph I downloaded their source code（ https://github.com/DrKLO/Telegram …… -
Address mapping of Java cassnadra object freeze annotation > >,
I tried to insert data into Cassandra (2.1.9) create table user{ name text,addresses map<text,frozen<lis…… -
Java – the difference between defining variables inside and outside a loop
In terms of style or performance, is it better to define variables inside or outside the loop? For example: int var; f…… -
Java – JPA or hibernate generates (non primary key) column values instead of starting with 1
I want a JPA / Hibernate (preferably JPA) annotation that can generate the value of a column. It is not a primary key …… -
Java – xpages: managedbeans often “lose” global domino session objects
I'm building a managedbean for the xpages application Currently, the bean is registered in the view - scoped faces - c…… -
Error passing volatile STD:: queue discard qualifier [- fpermissive] C 98
I have one volatile std::queue<int> requestQueue; When I try to call any of its methods (pop, push, empty, front…… -
Java – static and non static overloads to each other
Are these two functions overloaded class yogi{ public static void fun(){ System.out.println("Fun"); } …… -
Cannot instantiate a value of type java.util.linkedhashmap from a string value (‘{‘); there is no single string constructor / factory method
I have the following two classes: @JsonIgnoreProperties(ignoreUnkNown = true) public class ChangesJSON { @JsonPro…… -
Get the start time of the first 30 days in Java
I tried to get the current date and time for the first 30 days But it's nothing else new Date(System.currentTimeMillis…… -
Read file into array – Java
I'm practicing Java and watching the exercise online: But I'm in the situation I need Read the file again,and initiali…… -
Java regular expressions do not delete points
I am trying to delete "..." in the text and replace it with "." My code: System.out.println(TextHandler.class.toString…… -
Use a Java stream to connect the elements of two collections with separators
I have two ways to say: ImmutableSet<String> firstSet = ImmutableSet.of("1","2","3"); ImmutableSet<String>…… -
General functions in Java
I'm not familiar with some general syntax in Java public static<T> T foo(T... a) Can anyone explain its meaning …… -
Java – analog type conversion object
I have a simple method in the bean to handle cell editing events in the primefaces data table The method is as follows…… -
A Java object is not an instance of a declared class
public class SendEmailImpl public class SendEmailImpl { private boolean isValidEmailAddress(String email) …… -
Java thread stop Notifier
My task is to use multiple threads to perform decompression I did it with the following structure // A class for Unzip…… -
Java InputStream closed in thread
I tried to read from the InputStream in the thread The class that thread should run looks like this static private cla…… -
Java – valid anagrams code – one of 32 cases failed Through 31 cases
I tried to write a little code for the puzzle, and then I wrote onw String s = "anagram"; String t = "nagara"; Map<…… -
Java – moves characters in a string to the left
I'm a novice at stack overflow. I have a lab problem with a programming class that has been avoiding me The problem re…… -
How to refactor this HashSet in Java
I'm new to Java I have a HashSet method. I want to know a better method to encode the following code: public HashSet&l…… -
Java – is there a way to loop variable names?
For example, I have the following variables: //String Var1 = something,Var2 = something etc.. for (int i = 1; i <= …… -
Generic – rxkotlin: attempt to add custom error capture
I'm trying to write my own extension function for rxkotlin, which will make observable handle a specific error type (t…… -
Java – generics and inheritance?
See English answers > java: can't to generic list mylist 4 public static void main(String... args) { List<C……