Java
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Java – calling a new thread inside is a constructor
Is it correct to create a thread and call its start () method in the constructor of the class? public class Server imp…… -
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Construct unique numbers for strings in Java
We require more than 10 million strings to be read / written in the file In addition, we do not want duplicates in the…… -
Primitive data types and portability in Java
I quote Herbert Schildt's Chapter 3 data types, variables and arrays: What do his last two lines mean? How to specify …… -
Java – unable to load jdbc driver Why? (spring, dormancy)
I created a program (spring hibernate) through Maven two weeks ago, and now it has a problem loading the jdbc driver (…… -
The problem of “while” in Java
I'm trying a few exercises in the Java programming book I have the following code: import java.io.*; import java.util.…… -
Java – spring 4 websocket remote proxy configuration
I managed to create a simple web socket application with spring 4 and stomp Please refer to my previous question here …… -
Java Sevlet Mapping. Welcome file list
On my web In the XML file, I have this <!-- WELCOME FILE LIST --> <welcome-file-list> <welcome-file…… -
Java – Sax parsing and coding
One of my contacts encountered Sax problems parsing RSS and atom files According to him, it's like text from an item e…… -
Java – how to dynamically calculate the color list?
In order to represent the object list with different colors in GWT widget, we need to dynamically obtain the color lis…… -
Arm64: ldxr / stxr and ldaxr / stlxr
On IOS, there are two similar functions, osatomicadd32 and osatomicadd32barrier I want to know when you need the barri…… -
Java – finds and counts specific words in a text file
Can someone help me with the code? For example, test txt： hi hola hey hi bye hoola hi If I want to know in test Txt h…… -
Java – FreeMarker – remove commas from milliseconds
Using FreeMarker, I want to display the date in milliseconds: ${mydate?long} But I get a comma separated millisecond a…… -
Java – using collections Frequency() prints some values
I have an array as follows: int[] array = {11,14,17,11,48,33,29,22,18}; What I want to do is find duplicate values and…… -
Java – ‘for’ loop can be replaced by ‘foreach’
My code is: ArrayList<People> people = new ArrayList<>(); // people.add(...); // people.add(...); …… -
Java – how do I limit the size of a table?
I have a SQL Server 2005 database I'm recording the data in the table I want to prevent the table data from getting to…… -
Java – how to “put” values into a HashMap using JSTL
I'm looking for key value pairing for HashMap using JSTL only Is that possible? I know how to retrieve key value pairs…… -
What does this class declaration mean in Java?
I just study trees and one thing I don't understand is class declarations: For example: class binarysearchtree < T …… -
Partition between integers in Java
I need to divide integers in Java, and the result should be a floating point number Can I use the / symbol? For exampl…… -
Java – the problem of implementing removeAll for a custom object list
There is a scenario in my code where I need to compare two lists and delete the objects in the second list from the fi…… -
Java – how do I configure the findbugs Maven plug-in to check only annotation violations such as @ nonnull?
I have implemented the answer to this question, so @ nonnull violation makes the build fail But the problem is, this i…… -
Java – why list Sort does not use the optional API
Java 8 introduces a new default method on the list interface to sort it Its signature is: void sort(Comparator<? su…… -
Java – start H2 database programmatically
I am writing a server - client application in Java. I need to implement a local database on the server. I decided to u…… -
Java – how many objects are created
I'm discussing how to use strings and stringbuffers in Java How many objects were created in each of these two example…… -
How to convert a Java Date object to a jruby time object?
Using J ruby, is there a good way to convert Java date objects to jruby time objects? I'm using the latest version of …… -
Java – why do static members make the language not object-oriented?
I'm learning Scala. I came across this statement in odersky's programming Scala Second Edition: I don't have enough ex…… -
Java generics and addall methods
Addall (..) in Java collection What is the correct parameter type for the method? If I do something like this: List<…… -
Java – what is the difference between T and T in the return type of a method?
I have a way, like this, public <T> T doSomething(Class<T> T) { return T.newInstance(); } I can do it like…… -
The Java – Weblogic management console is too slow
I have installed Weblogic 10.3 3. A simple domain is configured using the default configuration After starting Weblogi…… -
Java – why include class names when referencing static variables?
When doing some Java jobs, I answered a question by writing an instance method. In the method, I used some static fina…… -
Where can I find the Java source code for the Vigenere password?
In my application, I want to implement some encryption So I need the code for the Vigenere password Who knows where I …… -
Java – how to ignore unit tests when conditions are met?
I wonder if there are comments or methods that can only execute tests if pre conditionoin is satisfied? Solution You c……