Java
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How do I change the old for loop to intstream?
This for loop traverses the int array It changes the value of (index - 1) to the value of the current index So the res…… -
Java – use objects in your own constructors
Is it possible (or wise) to use an object in its own constructor? (sorry for the noob problem of improper production) …… -
Mutli thread in Java
When I'm at @ L_ 502_ There is a synchronized method in 0 @ and if multiple threads (such as 10 threads) try to access…… -
Java – use JUnit test in Android studio of firebase
I want to write unit tests for this class in Android studio, but due to the use of firebase, I have a problem creating…… -
In Java: what happens if I change a key in a HashMap to equal another key?
See English answers > changing an object which is used as a map key But what if I change the existing key to be equ…… -
Java – how do I delete elements from a hash table using their values instead of keys?
I'm a novice in hash table. I just understand its basic operation Hashtable<Integer,String> ht = new Hashtable&l…… -
Java intelligently converts seconds into time
I want to create a library because I can't find one to convert seconds or milliseconds into time Well, I mean: 1) If I…… -
Assembly – vmovdqu what are you doing here?
I have a Java loop as follows: @ h_ 419_ 7@ public void testMethod() { int[] nums = new int[10]; for (int i = …… -
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…… -
Java – exception in JUnit interrupt
See English answers > JUnit exception testing 5 For example The testappleissweetandred test calls the following – t…… -
Java Math. POW does not work properly
See English answer > integer division: how do you produce a double? 10 System.out.println(Math.pow(16,0.5)); is 4.0…… -
Java filter list to generic type T
What should I do (without compiling): <T> List<T> getElementsOf() { return list.stream() .…… -
Java – Scala check optional string is null or empty
I'm new to scala. I want to learn how to add null and null checks to optional strings? val myString : Option[String] …… -
Java – x = x equals x = 2x 1: why?
The question is just curiosity: I want to know what the value of some int x is after the x = x line int x=10; x+=++x; …… -
Java – manifest merge failed – access to Google Maps V2
Hello, I'm building an application through the stackskills lollipop tutorial in Android studio I'm fully following the…… -
Why double in Java for a long time?
SSCCE： public class Test { public static void main(String[] args) { Long a = new Long(1L); new A…… -
Java – how to find duplicate rows and display the number of repetitions before them
Yes, it's a trivial problem, but I didn't find a duplicate problem Currently, from this collection (ArrayList): Java C…… -
Java – spring boot – the request method ‘post’ is not supported
Exception pagenotfound: request method 'post' is not supported in my spring boot application This is my controller: @R…… -
Why does Java enum need to check class and declaringclass in the CompareTo method
The type parameter E in enum is defined as < e extends enum < E > > So why do we need to check getClass ()…… -
Java – IIS 403 that prohibits the use of / in URLs
I have IIS (Microsoft IIS / 7.5) returned 403 Forbidden, I can't figure out why I narrow it down to / but only if it h…… -
Is java an import keyword for source or binary files?
I know I can use the import statement to include a class or group of classes in my java project For example, import Ja…… -
Why use bitwise or in catch blocks to handle exceptions in Java?
Why use bitwise OR here? try { //some errorprone code } catch(NullPointerException |NumberFormatExceptioon…… -
Struggling wildcard in Java
I have a very basic question The following code cannot be compiled (assuming Apple extensions fruit): List<? extend…… -
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 …… -
Modify BigInteger after Java partition
I've read a lot here and can't completely find out why this line is wrong: ArrayList <BigInteger> data = new Arr…… -
Changes of Java 7 for HashMap in Java 5
I am not a Java expert. I just experience the changes in the output of the following programs on Java 5 and Java 7 Doe…… -
Java – IntelliJ: search for checked exceptions, declare them in the method signature, but never throw them into the body
I have a fairly simple IntelliJ / tools question here: Thank you in advance Solution Open the settings and select edit…… -
How do I enable gzip for restcontroller?
See English answers > using gzip compression with spring boot / MVC / javaconfig with restful 8 @RestController pub…… -
AWS SQS Java. Not all messages are retrieved from the SQS queue
I've been trying to use AWS SDK for Java to retrieve all messages from the SQS queue I have learned about the distribu…… -
Date – how do I get the start and end times of a period?
I have an enumeration timeframe with values such as yesterday, lastweek, nextmonth, etc I'm trying to write a method t…… -
The Java list ` of ‘method is very confusing
When I look at a Java document It is very overloaded, and the number of all elements ranges from 1 to 10 It says: I do…… -
java – ClassNotFoundException：org. glassfish. jersey. internal. Runtimedelegateimpl was not found in the OSGi package with CXF dependencies embedded
This is related to jax-rs-2-0-change-default-implementation When I try to deploy webapp, I get the following exception……