Java
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Java uses “extend” and range resolution / point operators?
I have encountered this problem while reading some code, and I have no idea what it means I tried to use Google search…… -
Serializing classes using byte arrays in Java
I have a class with byte array in Java When I serialize and deserialize class objects, the value of the byte array is …… -
Java – serialization [replication] of lambda
See English answer > unable to deserialize lambda 2 I have two completely separate projects that contain a class It…… -
Java – write a program to round a number to the next multiple of 10 given the following conditions?
MyApproach I created two functions in the first function, and I calculated the sum of all four numbers In the second f…… -
Java – malformed JSON: unexpected ‘<' in spring
I want to make JSON from JPA @ entity. I have @Entity @JsonAutoDetect public class Bar implements Serializable { …… -
Java – what exactly is system out？
I've noticed that system. Net has never been initialized through a jar file launched from the command line (that is, t…… -
Java generics – differences between method declarations
What is the difference between the following two method declarations: 1. <R> Stream<R> myFunc(Function<…… -
Java streams – how to use conditions on keys to translate all values in a collection map
I have a map Let's talk Map<Long,List<MyObj>> I want to create a long array in all myobjs, where the key (…… -
R: Checks whether multiple elements of the vector appear in the string vector
I'm trying to create a function to check whether all elements of the vector appear in the string vector The test code …… -
Java – the difference between 2D arrays
I want to know the difference between these loops in a 2D array: for (int r = row - 1,c = column - 1; r >= 0 &&…… -
What does OIO mean in Java?
Please forgive me for just starting to learn java network programming I just read netty in action and mentioned an OIO…… -
Java – NoSuchElementException when finding a match in the list
The following old-fashioned, simple code works normally (traversing the string list and returning true because it shou…… -
Instance initializer in java interface
Hey, I wonder if I can initialize the interface when making the implementer It's like a blank constructor in an abstra…… -
Java, Apache POI, memory leak and excel file
I need to read (15000) Excel files for my thesis I'm using Apache POI to open them and analyze them later, but after a…… -
Java – how to sort HashMap entries by comparing values, where each value is int []?
I have a HashMap defined as HashMap < string, int [] > The value is int [], where there are only 2 numbers What …… -
Java 8 Lambdas and concurrent interpretation
I'm reading Lambdas in Richard Warburton's Book Java 8 Lambdas He began to discuss the use of concurrency in modern CP…… -
Java – how many calculations must a computer perform in a binary search?
Here, I have an array: {1,3,5,6,7,8,9,11,13,14,15} It's simple. However, we will use binary search to search the index…… -
Java – the cron expression of the spring scheduler – runs only once a year
I like spring service @Scheduled( cron="0 0 7 * * SUN") public void doSomething() { // do something } I know you …… -
Java – error while trying to run weld se application – weld se container failed to initialize – bean archive not found
I created a simple java se application using weld se :compileJava UP-TO-DATE :processResources UP-TO-DATE :classes UP-…… -
Java – use mockito to simulate enumeration?
I need to simulate the following enumeration: public enum PersonStatus { WORKING,HOLIDAY,SICK } This is beca…… -
Java – how to insert millions of data into a database
I tried to insert a million records into the database table I want to create at least three threads, each thread trigg…… -
How do I start three tasks that will run sequentially in Java?
I'm trying to start three tasks: the first one will read some emails, generate some charts based on these emails after…… -
Convert Map > > to list using java 8
I'm trying to convert map < string, navigablemap < long, collection < string > > into list < string …… -
Java 8: how volatile fields work with lambda
I'm new to Java 8 and multithreading I tried this code below public class Test { public static boolean bchanged = …… -
How to convert a list into a map in Java 8 Map function in chain
See the English answer > java 8 grouping using custom collector? 3 class Passenger { String type; String firs…… -
java – NoClassDefFoundError org / apache / poi / ss / usermodel / Workbook
I'm running a shell script that calls Java classes to get some data from the database and use the data to create an ex…… -
Java – a concurrent collection that maintains the insertion order
I am looking for a concurrent list that can maintain the insertion order Does anyone have some good recommendations? I…… -
Java files: suppress hard coded text warnings?
Because I have to add a separator in textview (e.g., ",...), I will receive a hard coded text warning (don't conceptua…… -
Java – how do I detect if the MIME type is an executable?
I am using Apache Tika to detect the MIME type of the input stream http://www.file-extensions.org/filetype/extension/n…… -
Java – onclicklistener (Android studio) in the check box
This is part of my code, including Check@R_521_2419 @( Chck@R_521_2419 @No)： final Check@R_521_2419@ Chck@R_521_2419@…… -
Java – outofmemoryerror: compress class space
I received this error: "java.lang.OutOfMemoryError: Compressed class space" Until I figure out what trigger it is, I t…… -
Multithreading – Delphi pointer and memory release
I am using custom windows messages to exchange information from the worker thread to the form in the main VCL thread W……