Java
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Overhead and code speed (java.io.file array and java.lang.string array)
Just trying to sort out a small category I have here At present, I am developing an application involving collecting t…… -
Java – CompareTo may return 0 instead of TreeSet / treemap
I need an ordered set of objects and am currently using TreeSet My problem is that CompareTo of objects usually return…… -
java. util. zip. Zipexception: duplicate entry with firebase
I'm building an application using firebase, but I got a duplicate class error I checked all dependencies, but I couldn…… -
java – DataOutputStream#writeBytes(String)vs BufferedWriter #write(String)
I want to create an HTML file for my report You can use bufferedwriter #write (string) to create the content in the re…… -
Java – randomgenerator – lost 50% of aircraft simulation
I'm working on a problem that I'm a little confused The problem is, suppose you were a general of the British air forc…… -
In Java, is there a more concise method for if statements with a large number of |
I know this problem is basic, but I'm looking for a less clumsy method. The following if statement: if ((sOne.Contains…… -
Collections. Binarysearch (list, K key) clarification Java
In view of the following declaration, it is taken from this Oracle Java Tutorial and related to the binarysearch() met…… -
Java – performance difference between post increment and pre increment operators?
In Java, does the use of post increment and pre increment operators have any performance impact? Example: i++ ++i Sol…… -
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 – 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…… -
Java – what does the syntax “final string… Args” mean / do?
This should be a fairly simple question I looked around and couldn't find any topic about this grammar, and "..." made…… -
Java – how to create a class that I can’t change and implement an interface?
I have a class from another closed source library, but I want to be able to use its interface The reason is that I don…… -
Java – ‘for’ loop can be replaced by ‘foreach’
My code is: ArrayList<People> people = new ArrayList<>(); // people.add(...); // people.add(...); …… -
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 does eclipse actually run JUnit tests?
I encountered a difference when running JUnit tests in eclipse and ant This is the scenario: Everything runs as expect…… -
Get image path JavaFX
I want to get the pathname of the current image loaded in my image object I have the following code: Image lol = new I…… -
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 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…… -
When the mouse clicks, Java draws a circle
I'm writing a program that draws a circle when I click the mouse So far I have written the following code import java.…… -
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…… -
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…… -
Java – the dropwizard does not record custom recorders to files
I have a dropwizard application. I configure the logger appender as a file, as shown below: logging: level: INFO …… -
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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 …… -
Java – return files in spring MVC rest
I have the rest service code. The following code returns a file. Now the problem is that I get an original response in…… -
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…… -
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 – use appbarlayout Behavior. Dragcallback to control the scrolling of the collapsed toolbar layout
I want to be able to enable and disable scrolling on the collapse toolbar Who can tell me how to use appbarlayout Beha…… -
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 – 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 – get components from JList by clicking the location
How do I get components from JList by clicking on a location? I have my own list cell renderer, I insert some panels a…… -
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 (……