Recent Posts
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Java hashcode () conflicts for objects that contain different but similar strings
When verifying the output data of the program, I determined that the hash codes of two different objects are the same …… -
Java – synchronized vs readwritelock performance
I try to prove that synchronized slows down when there are many readers and only a few authors Somehow, I proved the o…… -
Java – generics and inheritance?
See English answers > java: can't to generic list mylist 4 public static void main(String... args) { List<C…… -
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 – 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 <= …… -
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 – 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…… -
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 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 thread stop Notifier
My task is to use multiple threads to perform decompression I did it with the following structure // A class for Unzip…… -
A Java object is not an instance of a declared class
public class SendEmailImpl public class SendEmailImpl { private boolean isValidEmailAddress(String email) …… -
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…… -
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 …… -
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>…… -
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…… -
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…… -
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…… -
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…… -
Java – static and non static overloads to each other
Are these two functions overloaded class yogi{ public static void fun(){ System.out.println("Fun"); } …… -
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 – 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…… -
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 – 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…… -
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 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 …… -
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 – 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…… -
java – spring data redis master slave config
Here is my jedis configuration @Bean public JedisConnectionFactory getJedisConnectionFactory() { JedisConnectionFa…… -
Java – HashMap can only be copied through hashcode()
See English answers > Why do I need to override the equals and hashcode methods in Java? 28 Therefore, whether K is…… -
Java – how to insert millions of data into a database
I tried to insert a million records into the database table I want to create at least three threads, each thread trigg…… -
Java – the synchronization in the constructor makes it happen before
I have a question about how to ensure that objects are thread safe through the JAVA memory model I've read a lot that …… -
Parallelism in rxjava – filters
I have some very simple code and read a bunch of strings & application filters I want the filter to run on multipl……