Recent Posts
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Invoking non abstract methods in abstract class java
I have three classes This seems to be a basic problem But I can't find the answer through Google search public abstrac…… -
Parallel programming with threads in Java
Let's say that in Java, using executorservice, I create a 4-thread thread pool and submit it to say 10 tasks, which me…… -
Java – why does it want the method to be static?
I'm building my first game. I rely heavily on various tutorials and guides on the Java website. I have a problem packa…… -
How to effectively convert java code to Python?
I would be glad if you could tell me how to translate code from Java to python Solution If you want to translate java …… -
Java – dynamodbmapppingexception: mapping without hash key
When writing dynamodb Java application, if the table and its data model are not configured correctly, you can receive …… -
Java – mockito: wanted but not referenced
I have the following test methods: MyClass myClass= Mockito.mock(MyClass.class); Mockito.when(myClass.methodUsedInMeth…… -
Can generic types be extended to multiple classes in Java?
I'm trying to write a method using generic parameters in Java. I want to limit it to one of three possible classes (fi…… -
Java – JUnit asserts double arrays
How do I assert that two double arrays contain the same elements There are some ways to assert that integer arrays and…… -
Date – how do I get the start and end times of a period?
I have an enumeration timeframe with values such as yesterday, lastweek, nextmonth, etc I'm trying to write a method t…… -
Why double in Java for a long time?
SSCCE： public class Test { public static void main(String[] args) { Long a = new Long(1L); new A…… -
Java – create arrays using a for loop
Whether it is possible to create arrays in a similar style in Java, I have been searching and can't find anything int[…… -
Java – accepts only a few characters of EditText
I need to implement EditText on Android, which only accepts a specific range of characters, namely: "s, a, Q, W, R, B,…… -
Java – compare the efficiency of two o (n) algorithms
I'm studying linked lists, and the problem is - write a function to print the middle items of a given linked list (ass…… -
The Java iterator gets the next one without incrementing
I write the following loop in Java for each loop that I want to access the current and next elements of the link list …… -
Java – get all rejected additions to set
I'm not very good at hashsets. I want to know if I can use them The addall method retrieves duplicates deleted by hash…… -
Inheriting a class without a parent type in Java
How do I inherit from other classes without using a parent type? For example, I hope that car can adopt all methods an…… -
Java – why does changing an object in an ArrayList change it in all other ArrayLists?
I'm making a CPU scheduling simulator (for school projects) There is a problem with my roundrobin function When I do c…… -
Redundant wording in Java array and ArrayList declarations
A typical ArrayList declaration in Java has the following types: ArrayList<Object> name = new ArrayList<Objec…… -
Why do I get Java Lang.illegalargumentexception: wrong number of parameters when calling method with varargs using reflection
See English answers > wrong number of arguments error when invoking a method class Sample{ public void doSomet…… -
When using java 8 update101, HashMap Entries cannot be cast to collection
After updating to Java 8 update 101, I encountered an exception in the following code It works well with Java 8 update…… -
Java – how to resolve jar conflicts at run time?
I have two jars in conflict They all contain a class with the same package name and class name For the same reason, I …… -
The Java – mybatis – mapped statements collection already contains values
When registering the mapper class when my server starts, I throw the following error message, [artifact:mvn] 2016-05-0…… -
Java – why does the dropwizard configuration not work?
Recently, I changed the dropwizard version of HVDF project from 0.6 2 to 0.8 2. Once I try to run the application, I g…… -
Java – interpretation of V – > V > 5
I have a given function call, and Java gives me an error because the object cannot be compared with int (of course...)…… -
AWS SQS Java. Not all messages are retrieved from the SQS queue
I've been trying to use AWS SDK for Java to retrieve all messages from the SQS queue I have learned about the distribu…… -
Java – manifest merge failed – access to Google Maps V2
Hello, I'm building an application through the stackskills lollipop tutorial in Android studio I'm fully following the…… -
Java – number of clicks to hear the activity button from within the clip
I just started learning fragments. I have an activity, that is, 1000 lines of code, which I have converted into fragme…… -
Java – Dropbox V2 uploadbuilder: “string ‘path’ does not match pattern”
I'm trying to use Drop@R_817_2419 @The V2 API uploads my application data files (SQLite and preferences) from my Andro…… -
Java cache array length calculation in loop
See English answer > what is the cost of calling array Length 8 int[] someArray = {1,2,3,4} for (int i = 0; i <…… -
How to create a string representing Java as if it were an unsigned 64 bit value
My component was passed a long value, which I later used as a key in the cache The key itself is a string representati…… -
How to add a scrollbar in JavaFX
I'm trying to add a scrollbar to H@R_869_2419 @Yes Scrollbar was added, but I didn't scroll How can I make it work? pu…… -
Java interrupts or exits a thread
I have a thread that performs several different tasks Each task depends on the success of the previous task If this is……