Java
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Is there a parallel processing implementation of HashMap for Java? Is it even possible?
Looking for the magical parallelhashmap class More succinctly, can you use multiple threads to speed up HashMap lookup…… -
Java – can multiple @ qualifier annotations be used in spring?
I have a set of beans that feature two properties They are basically serializers for different classes and purposes Fo…… -
java – boolean. Isinstance (true) is false?
problem Class objects of Boolean fields do not recognize other Boolean values as instances code public class Test { …… -
Multithreading – switch to parallel coding
We all write code for a single processor What do we need (software tools, logic, algorithms) to implement this transfo…… -
Java – split string – Cartesian
The following string is given: “foo bar-baz-zzz” I want to divide it into the characters "" and "-", keep their values…… -
Java – why do internal static classes extend external abstract classes?
I'm trying to extend some existing code that implements trees using composite patterns As expected, there is an interf…… -
Java – understand the “symbol not found” error
What is this mistake? cannot find symbol,symbol: method getstring(java.lang.String) Location: class InternalFrameDemo…… -
Why not use class for Java – t getInstance (final type)?
So I'm delving into Java and curious about the use of this type parameter <T>T getInstance Then arg Class<T&g…… -
E-mail module in Java?
Please suggest the best email module for sending email in Java Solution To further simplify the use of JavaMail, you c…… -
I can’t figure out my simple java homework
I have this programming task, which can convert between meters and feet, and between kilograms and pounds When I told …… -
Why does the Java ArrayList class return a Boolean value to add?
My teacher gave me this analogy to the method I was writing I still don't understand why the add method returns a Bool…… -
Default initialization of private fields in Java
Suppose I have a class named person: class Person{ private int num = 1; } When calling an empty constructor for th…… -
Java – what’s faster – storing data in lists or databases? (robot)
I am currently working on a school project (Android application). We should store user fee and income information in t…… -
Java EE App Server Hello World
I am very familiar with individual Java application development, but I will soon use Java EE application server develo…… -
How to create a random number with a combination of 5 digits and charter flights
I want to generate such a random number > ADF1845CFT > ADF1864ATY > ADF18AT65Y I successfully created a 5-dig…… -
Java – meaning of API
Anyone can tell me the meaning of API in the following paragraph, which is actually about transfer object: Thank you i…… -
Java-8 – Java 8: filtering and mapping on the same method output
We try to refactor the following code into Java 8: List<String> list = new ArrayList<>(); Iterator<Obj&…… -
Java – sort objects by multiple attributes
I've been studying things that require me to classify objects (soft drinks) according to three attributes - Software (…… -
Java – how do I know how many objects will be created using the following code?
For strings, I'm a little confused about the object situation, so I want to know how many objects will be created with…… -
Java – mockito’s spy object in spring
When I try to snoop on objects in unit tests, @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations …… -
Vector – gets the array value from the index set
I am looking for a generalization of the nth function Clojure remove item from vector at a specified location Solution…… -
Java – applet – how do I use this code using strings instead of characters?
I'm slowly trying to write a program that converts hexadecimal numbers to decimal numbers I'm not interested in readin…… -
Java – how do I pass parameters to a thread and get the return value?
public class CalculationThread implements Runnable { public class CalculationThread implements Runnable { int inp…… -
Java – wicket – which ORM?
I am looking for an ORM that is easy to use and integrated for wicket applications I'm thinking about hibernate Is thi…… -
Java – variables are instantiated in kotlin only when kotlin is empty?
It can be said that I have a variable: var myObject：MyObject？ = null It should be cleared somewhere: myObject?.clear…… -
Java – how to prevent HashMap or treemap from replacing previous values
If it already exists, how can I prevent HashMap or treemap from replacing the previous key value? In addition, I want …… -
How to create an autocomplete pop-up window in jtextpane in Java?
I am creating an SQL editor I am using jtextpane as the editor I want to implement autocompletion for table names such…… -
Java encodes the file as a Base64 string to match other encoded strings
private static String encodeFileToBase64Binary(String fileName) private static String encodeFileToBase64Binary(String …… -
Incredible little decimal best Java object
What Java object is best for storing tiny decimal values, such as 10 ^ - 25? When using minimum space, which object ho…… -
Java – is there any way to test 2-way SSL through the browser?
If so, how to set the authentication certificate and what files do you need? Yes pfx？ How would you install it in you…… -
Java – a faster way to find the key for a given value from the map?
I want to find the key of a given value from HashMap. At present, I have to pass all keys and check its value in the m…… -
Java – fast string search, such as startswith() is not equal to ()
I have a sequence list (a dictionary – 100k words) and many words are often searched in this list Therefore, performan……