包含标签：Java 的文章
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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 …… -
Java – MVN jetty: running failed to find my loginservice
I set up a dock security domain as follows (for MVN jetty: run) POM xml <plugin> <groupId>org.mortbay.…… -
Put the object into Java util. In properties
I'm trying to understand why I implemented Java util. Properties. It has two interfaces: getproperty / setproperty, wh…… -
How to make the java desktop application of the installer multi platform?
How do we make a jar file installer that can run on multiple platforms Is there any simple way because I don't know mu…… -
Java – how do I get all the files indexed by Lucene?
I created a Lucene index I want to get all the files, just sort according to the fields, no search criteria! Solution …… -
Java – what does “container” mean in the context of programming?
I'm learning spring. The term "spring container" often appears in this article However, I know that "container" is not…… -
1 field of multiple regex @ patterns?
I tried to apply multiple @ pattern annotations to a single field: @Pattern(regexp = "(?=.*[0-9])",message = "Password…… -
Java wrong time zone
I have an instance of Java that seems to use a completely incorrect time zone Instead of using the Australia / Sydney …… -
Pop up and start JPA2 hibernate – enable L2 cache
I use spring boot 1.2 5 and JPA 2 annotation entities (and Hibernate as the underlying JPA Implementation) I want to u…… -
How to display images in Java applications
I want to display an image in my java application I found a code that downloads images from web server and displays th…… -
Java immutable classes are much slower
I need some complex math libraries, so I hesitate to use immutable complex libraries and variable complex libraries Ob…… -
Comparing doubles in Java gives strange results
I really don't understand why the following happens: Double d = 0.0; System.out.println(d == 0); // is true System.out…… -
Best practices for Java methods to return multiple values?
See English answers > how to return multiple objects from a Java method? twenty-three Solution 1 private boolean aM…… -
Even if the file is unreadable, Java can return file length()
I have a file that I have banned every license No one should be able to read documents, right? Actually, if I run File…… -
Java – unparseable Greek date – simpledateformat
I'm trying to use simpledateformat to read a string representing a Greek date and time (such as "28") Μαρτίου 2014,14:…… -
Multithreading – Delphi threading using trestrequest
I am new to restrequest tool I hope someone has solved the problem of waiting for asynchronous calls to complete I hav…… -
Java, how to split string and shift
How to split a string 2 characters and shift My string is = todayiscold My goals are: "to", "od", "Da", "ay", "Yi", "i…… -
Java – use gson to modify JSON instead of POJO
I want to modify a JSON content without converting it to POJO I am using gson library The following are use cases: Str…… -
Java – collect all values of the set field
I have a collection with a field type of set with some values I need to create a new set that collects all these value…… -
Java – combines immutablelist and varargs of guava
I want to create a constructor that will use one or more integers and save it as a field immutablelist According to Bl…… -
Java – DBCP: removeabandoned vs evicted
I didn't figure out the difference between removeabandoned and deported I read somewhere that removeabandoned has been…… -
. Net – tracks changes in complex object graphs
I started thinking about tracking changes in complex object graphs in disconnected applications I've found several sol…… -
Java – query two related tables (joins)
This is the first table in hive – it contains information about the items we are buying CREATE EXTERNAL TABLE IF NOT E…… -
Function objects in Java
I want to implement a JavaScript method in Java. Is this possible? Say, I have a person class: public class Person { …… -
Java – why do I need to add artifact jsr305 to use guava 14?
When looking up the information of stack overflow, I saw a question similar to mine, but there was no real answer here……