Java
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Java – use the stream to find objects in the list
See the English answer > why filter () after flatmap () is "not completely" lazy in Java streams? 6 // returns [i,j…… -
Implementation of counting using group in Java 8
I am looking for the implementation of group by, and then filter it according to the count in the lambda expression se…… -
Java – hibernate subquery
I have a problem creating subqueries using hibernate Unfortunately, the subqueries class has almost no documentation a…… -
Java hash map thread visibility
I fully loaded a Java HashMap during initialization, but after initializing multiple threads, the HashMap will read th…… -
Java – why does the spring task scheduler wait for the last task to complete?
I have the following task scheduler settings: <bean id="Task" class="foo.bar.Task" /> <bean id="TaskSchedule…… -
Focus debugging in Java
Question: I'm trying to debug some focus related issues in my Java Swing application. Sometimes, some components seem …… -
Java: can integer = null be set?
If this parameter exists in the database, I have a function that returns the ID number If not, null Is this begging fo…… -
How do I unit test the javanica @ hystrixcommand annotation method?
I am using javanica and commenting on my hystrix command method, as follows: @HystrixCommand(groupKey="MY_GROUP",comma…… -
Delay multiple TCP connections from Java to the same machine
(see this question in serverfault) I have a java client using socket to open concurrent connections to the same machin…… -
Using Java IO seeking bytearrayinputstream
How to find (change location) bytearrayinputstream (Java. IO)? This is obvious, but I can't seem to find a way anywher…… -
Java – GWT and enumeration issues
I have an enumeration in the client of the GWT application. When I try to run it, I receive an exception related to se…… -
Java – hashcode, implementation and relationship with HashMap
So I asked another related question here: Java string hash function with avalanche effect, but now I have a different …… -
UTF-8 encodes Java strings into properties
I have a single UTF - 8 encoded string, which is a series of key - value pairs that need to be loaded into the propert…… -
How do I create a key pair in Java based on a password?
I want to allow Alice to create a public / private key pair so that Bob can send her confidential messages However, I …… -
Java – unit testing, static and factory
I'm implementing a model in Java. It needs to iterate a set and go through some identification stages. It involves loo…… -
Java – @ size, @ length and @ column (length = value)
What is the difference between the validation check of the following three fields? @Entity public class MyEntity { …… -
Java – how to map a set of string objects using JPA annotations?
@Entity @Entity public class TestClass implements Serializable{ private Integer id; private Set<String> …… -
How do I turn the monitor on and off in a Java application?
How do I turn the monitor on and off in a Java application? If you want to know why, this is a self-service terminal s…… -
Java – how to bind two parameters using play 2.0 routing
I'm learning play 2.0 (using the Java API) and want to have a double / float parameter (location coordinates), like ht…… -
Using multiple SSL client certificates with the same host in Java
In my java application, I need to use SSL to connect to the same host, but I use a different certificate every time Th…… -
Java – is there any way to create a basic array without initialization?
As we know, Java always initializes arrays at creation time That is, new int [1000000] always returns an array with al…… -
How can the Java – @ Autowired annotation be used for private fields?
See English answers > what is reflection and why is it useful? 21 Solution It applies to reflection Here you can fi…… -
Java – does any program recognize that it crashed last time?
What is the best way to let the (Java) program recognize the crash when it was last run, and display a message "it loo…… -
Java – is it acceptable to use the hamcrest matcher in non test code
I tried to find a clear answer to using hamcrest matchers in non - Test code I have done some research and have some c…… -
Java – what is the reason for the failure: “jarsigner: failed to try to rename {file} to {file}. Org” sign up with ants?
I received an error: When trying to sign a set of cans with ants in eclipse Ant build works well in this project and h…… -
Multithreading – prevents / removes threads from publishing messages to the main UI thread
My problem is that if a thread quickly publishes messages to the main UI thread, and if I update the UI at that time, …… -
Java n-dimensional array
I need to be able to have an n-dimensional field, where n is the input based on the constructor But I'm not even sure …… -
Java – spring MVC: Form: RadioButton of Boolean attribute
I just want to know how to use Boolean values in spring MVC forms I try to use this Code: My jsp: <form:radiobutton…… -
Concurrency – can a single process run in multiple cores?
Can a single process run different threads on different cores? (I think they can) @ h_ 301_ 3@ In this case, different…… -
Use the latest JRE instead of the old java version. Can I guarantee that it will work?
Suppose I have a java project encoded in Java 1.5. I use a newer version of Java, but set the target to 1.5 If the cod…… -
Java – find the largest connected component in the adj matrix graph?
I try to find a way to find the largest connected component in adj matrix graph For example: 0000000110 0001100000 000……