Java
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Is java “public static void main (string [] args)” the only way to create a main method?
I wonder if "Java main method" is the only way to create a main method in Java Java main methods: Solution The JVM nee…… -
Java – isn’t it bad to import unused packages?
For example, when you work in a team with the same file, you can only partially understand the different packages requ…… -
Java – ACL security in spring boot
I encountered a problem setting ACL through Java configuration in spring boot application I created a small project to…… -
Java – why does the clear HashMap method clear the map added in the array list
I'm trying to reuse the same HashMap, such as the following example to populate the list First, I add some values to t…… -
Java – why does kotlin use = = for structural equality and introduce = = = for reference equality
In general, every design decision made by kotlin feels great in itself and provides a good java transition As a java d…… -
Java – collect results from parallel streams
I have a code like this: List<Egg> eggs = hens.parallelStream().map(hen -> { ArrayList<Egg> eggs = …… -
Switch statement found in Java method Does the method need to return something?
I was reading some Java textbooks trying to learn a new language, and I encountered this method private String monthNa…… -
Java-8 – Java prevents a lot of if and replaces it with design patterns
I use this code in my application and I find it very ugly for (final ApplicationCategories applicationCategorie : appl…… -
Laravel 5.3 – ClassLoader. Errorexception in PHP line 414
I'm using laravel 5.3 I just installed the intervention / image package in my project Everything is normal, but I enco…… -
How do I find the smallest BigDecimal field in a collection using a Java stream?
I want to use the Java stream to iterate over the list and find the lowest price for BigDecimal The following instruct…… -
Struggling wildcard in Java
I have a very basic question The following code cannot be compiled (assuming Apple extensions fruit): List<? extend…… -
Replace values that appear more than once in the vector in R
I have a value vector x <- c(1,2,3,4,5) For each occurrence, I want to replace it with the value in vector Y: y <…… -
Java – understanding TreeSet returns 0 during comparison
I created a student class like this: public class Student implements Comparable<Student> { private String f…… -
Java – is there a functional difference between initializing singletons in the getInstance () method or instance variable definition
Are there any functional differences between the two methods of implementing singleton? public class MySingleton { …… -
Java – throw exceptions in finally and catch blocks
There is a problem with the exception thrown in catch. Finally, stop: class MyExc1 extends Exception {} class MyExc2 e…… -
What does Java – compareto() actually return?
The CompareTo () method in Java returns a value greater than / equal to / less than 0 But value itself is my problem W…… -
java. Lang. illegalargumentexception “Dao fields cannot be set using spring 4 and Hibernate 4”
I'm trying to follow the tutorial (Using STS): Everything goes well except execution Here's what I got during deployme…… -
Combining values with Java 8 streams
If I have a list with integers, is there any way to build another list? If the header difference of the new list is lo…… -
Java – how to use reduce only to find the minimum value in the list?
I want to use reduce only to find the minimum value in list < integer > This is my original idea: List<Intege…… -
Java – can I create a file in my S3 lambda function?
I am creating a Java function for AWS lambda, which imports a file from AWS S3, as shown below: InputStream videoObjec…… -
Java – Jackson – serialize Boolean to 1 / 0 instead of true / false
I have a rest resource to receive a JSON object, which is a mapping from a user ID to a Boolean value, indicating whet…… -
Java – build executables from different jars
I wrote a program that contains various Java libraries used in the program I used NetBeans to make the jar file of my …… -
Java – @ suppresswarnings annotation benefits
@Is the suppresswarnings annotation for clearer code, or is there any performance improvement or advantage by adding i…… -
Java – spring resttemplate send list get list
I want to use spring's resttemplate to provide services. In terms of my services, the code is as follows: @PostMapping…… -
Java – Test and launch the spring boot application
I have a JUnit test. After the test, start a spring boot application (in my example, the main class is springtestdemoa…… -
Java – exception in JUnit interrupt
See English answers > JUnit exception testing 5 For example The testappleissweetandred test calls the following – t…… -
Java – two different variables that get the same value
I am currently working on a small java application, but I have a problem I created two different variables, but after …… -
Java return returns blank
I'm trying to create a Java method that returns the sum of two values X and y Currently, when I run the code, the outp…… -
Leiningen: create an executable jar to run without Java – jar
I tried to understand how to package a command - line application written in clojure for distribution I don't want use…… -
Read stream from S3 using clojure / Java
I have a large file on S3. I hope to decode and parse it when downloading I happen to use clojure Amazon library, but …… -
Java – improve code that breaks down faster?
I want to finish this code faster It returns all the factors (prime) of a long number If longnumber is specific, it ob……