Java
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Java – number of processor cores and size of thread pool
Many times, I've heard that the number of threads maintained in the thread pool is better than the number of cores in …… -
Multithreading – multi core CPUs share MMus and page tables?
On a single - core computer, one thread executes at a time At each context switch, the scheduler checks whether the ne…… -
Java – persistence. 0 was not found during Maven testing xml
I'm trying to load the test database in the test database for the Maven build process of integration testing persisten…… -
Java – JSF CDI: dialog scope bean [S] best practices
I am currently learning JSF 2.0 and am very happy with the existence of this session scope function, which is very use…… -
Algorithm – track the median of the extended array
Interview questions: The following edit gives you an array You make 2 stacks, one minheap and the other maximum heap N…… -
Java – persistent connection with JDBC to MySQL
I have an application that uses JDBC to connect to MySQL In some cases, the JDBC connection is idle for hours (or even…… -
Imposing constraints or restrictions on method bodies in Java
Context (Edit) Some clarifications are needed, so I will try to summarize the impact >The goal of the project is to…… -
Java – the ability to get progress on future objects
Refer to Java util. Concurrent package and future interface. I noticed (unless I was wrong) that the function of start…… -
java-ee – Web. XML: invalid content found starting with element JavaEE
I encountered this error on the eclipse ide <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http:/…… -
Java – is this vague method error eclipse Juno wrong?
I've been playing eclipse Juno today From Helios, this is a good upgrade Everything is fine except for a new compilati…… -
Java – how to forge initialcontext using default constructor
All, I try to do some unit tests in some old java code (no interface, no abstraction, etc.) This is a servlet using Se…… -
Java – creates an N by N diagonal matrix using basic logic
I want to create a matrix of N size, where n is a globally defined constant value. Now I just want to create a matrix …… -
Java – stop long running threads accessing the database
I started a few threads, but I didn't have a reference signal, a stop signal or something I am using a ThreadGroup and…… -
Prepared declarations collected in the in clause of the datastex Cassandra CQL driver
I am trying to run the following query SELECT edge_id,b_id FROM booking_by_edge WHERE edge_id IN ? I bind Long's Java …… -
Why does the same code work differently in Java?
I wrote the following code in Java and C, but the output of these programs is different Can you describe it This is ja…… -
Libgdx collision detection with tiledmap
I'm trying to implement a collision detection system by tiling maps I have a 2D Pokemon style game with a tiled map Sp…… -
Java – custom string class creation
I tried to use Java. Net in my eclipse workspace Lang package to create a custom class string Now I'm confused 1) why …… -
Java – dagger 2
Using dagger 2, I tried to inject singleton objects at multiple locations within a single range However, it seems that…… -
Java – how to deal with underflow in scientific computing?
I'm studying probabilistic models. When reasoning about these models, the estimated probability may become very small …… -
Java – after reasoning, l must be specified as long, F and D as float and double
Here are a few related questions According to the title, why should you specify the variable type as long or float, do…… -
Java – how do I call a parent private method from child?
See English answers > How can a derived class invoke private method of base class? 7 public class A{ private in…… -
java – Mockito ClassCastException
The method I want to test has a for loop and the logic of each element in blist: class A { void someMethod(){ …… -
Java – timer – how to calculate the difference between two dates using joda time?
I want to use joda time to get the difference between P (start time) and Q (end time) twice P and Q may be different d…… -
How to use byte array as a short article in Java
I have a byte array with size n. this array really represents n / 2 with different sizes Before writing an array to a …… -
Java – mongodb selects all fields, groups them by one field, and sorts them by another
We have a collection of 'messages' for the following fields _id | messageId | chainId | createOn 1 | 1 …… -
Java – liquibase inserts bit column, mysql, column with too long data
In liquibase, I define a table with a column of type bit (1), <changeSet author="foobar" id="create-configuration-t…… -
java. io. StreamCorruptedException: invalid type code: AC
See English answer > StreamCorruptedException: invalid type code: AC1 private ArrayList<Cheque> cheques = nul…… -
Java – which file is the eclipse deployment assembly configured in?
I don't seem to be here The configuration was found in the project file I'm looking for a way to programmatically chan…… -
Java – lists all possible subsets
I have a list of elements (1, 2, 3), and I need to get a superset (no duplicate elements) of the list So basically I n…… -
Java – how do I call a parent private method from child?
See English answers > How can a derived class invoke private method of base class? 7 public class A{ private in…… -
What happened to Emacs Java?
First of all, I don't want to start a religious war here. Forgive me for telling you a little story first I initially …… -
Java – is there any 2D game engine better than libgdx?
I started programming with libgdx a few months ago, and I found many basic tutorials I like the cross platform nature ……