Java
-
Java – get the inserted ID in the same statement
There is already an answer to this question: > how to get the insert ID in JDBC? six Thanks for your help. John pol…… -
How to delete elements in ArrayList from the indicated index
As shown in the figure, after running one method at a time, I want to delete the old item and prepare for the next cal…… -
Java – case insensitive checking of roles in HttpServletRequest
javax. servlet. http. The HttpServletRequest class has a method named isuserinrole I use it to check whether the user …… -
How to suppress the “picked up java_tool_options: – javaagent: / usr / share / Java / jayatanaag. Jar” message
I use Ubuntu 15.04 and Java 1.7 After updating to 15.04, whenever I enter any Java command, I will receive the followi…… -
Confusing the use of synchronization in Java: patterns or antipatterns?
I'm doing a code review of changes to Java products I don't own I am not a Java expert, but I strongly doubt that this…… -
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 – @ AspectJ cuts into all methods in the package
I have this working code for a specific package, but I want to configure it for all controllers, services and Dao pack…… -
Java – spring boot: persistence cannot be used
I've entered this stage, and - although I'm learning a lot - I'm starting to despair I've tried all the suggestions on…… -
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……