Java
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How does Java 8 add custom elements to a collection?
Is there a Java 8 mode to perform the following operations? for(int i;i<=100;i++){ Person person=new Person(); …… -
Java – if the else statement has four results, but only two seem to work
So I'm studying my first project on programming Never tried any programming I want it to be able to choose between fou…… -
Java – why does changing an object in an ArrayList change it in all other ArrayLists?
I'm making a CPU scheduling simulator (for school projects) There is a problem with my roundrobin function When I do c…… -
Invoking non abstract methods in abstract class java
I have three classes This seems to be a basic problem But I can't find the answer through Google search public abstrac…… -
RX Java – share() and publish() What is the difference between autoconnect()?
In my opinion I thinkhare () and release () Autoconnect () is the same But in this code, the result is different Obser…… -
How do I resize JavaFX images?
I have a JavaFX scene. image. Image, I want to resize it, for example, scale it by a given factor What to do (not conv…… -
A better way to use Java 8
I convert the following code into Java 8 code I wonder if I'm doing it right or if there are other good ways Java 7 fo…… -
java – ！ list. Isempty() and list Size () > 0, same conditions?
I see such code if (!substanceList.isEmpty() && (substanceList.size() > 0)) { substanceText = createAmoun…… -
Java – how to perform a series of sorting operations (multiple sorting conditions) on ArrayList
I have an ArrayList of objects on which I want to run a series of sorting operations I want to sort them by name first…… -
Java – a system that players drop (basically gravity)
I'm making a game like Doodle Jump to make your players as high as possible Now I let my player work and move But the …… -
Java – a faster way to batch save using Hibernate?
I have a program that reads text files line by line, creates a hibernate entity object from each line, and saves them …… -
Executing UNIX system commands from Java problems
I encountered a strange problem when executing system commands from Java code Runtime. getRuntime(). exec(“system_prof…… -
Java – questions about polymorphism and overloading
I try to understand the concepts of polymorphism and overloading I have the following code as an experiment However, I…… -
Java – third party object whose design pattern is “toString”
I have a third-party object that uses from Java ToString method inherited from lang.Object This method is useless But …… -
java – super. Problems with paintcomponent (g)
This is a clip: protected void paintComponent(final Graphics g) { Runnable r=new Runnable() { @Override public …… -
Java – the problem of compiling JUnit test classes with ant
I'm working on JUnit with ant build There was a problem integrating XML files My test class is in the same directory a…… -
Java – opengl for space simulator
Together with several friends, we started this Java based project independent of amateur platform for space combat sim…… -
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Java – what’s wrong with my factory?
I have some code like this: public abstract class Foo { public static Foo getFoo() { return new FooImpl();…… -
java：new File(“”,“name”)！= new file(“name”)？ (file constructor with empty string)
We have noticed this today Since there is a file named "existing" in the PWD of java process (Windows) new File("exist…… -
Java – spring promotion_ Required transaction attribute?
In http://www.vermatech.com/code/SpringTransactionExamples.html In the first case study given, testModel.deleteAllCoun…… -
Java Swing: separating UI components from logical behavior – how do you handle this?
What do I do in NetBeans, for example: >Create a UI component class with the suffix swing component type, for examp…… -
Java – spring: how to ensure that a class is instantiated only by spring, not by new
Is it possible to ensure that only spring can instantiate a class instead of using the keyword new at compile time? (a…… -
Java color opacity
I have a way to determine the color based on certain values The method is as follows: public Color color(double val) {…… -
Java – graph: find an algorithm to determine the shortest path from one point to another in a rectangular maze?
I am trying to work out an appropriate algorithm to move from the start position to the exit position in the maze 10 3…… -
Java – how to create an optional binding in Guice?
This is my client: @H_ 403_ 8@ @H_ 403_ 8@ class Client { @Inject(optional=true) Service service; } Sometimes we d…… -
Java – findbugs wants readObject (…) private serialization. Why?
I run findbugs on some code and it says that the readObject (...) method must be private to be called for serializatio…… -
Java – how do I download new files only from the server?
I have many CSV files that I want to download from Yahoo Finance every day I want my application to read the creation …… -
How do I convert bufferedimage to / from an image?
I want to convert buffered image to Java awt. Image. My source image is TIF, so I use Jai to read it as planarimage: T…… -
Java simple sentence parser
Is there any simple way to create a sentence parser in normal Java The parser should not only focus on the white space…… -
Java – how to test Guice singleton?
Guice singletons is strange to me First of all, I thought IService ser = Guice.createInjector().getInstance(IService.c…… -
Java – is it easier to use foo when it is represented by the class ArrayList rather than the interface list?
I see a lot of grammar and don't understand the reasons behind it I think you usually want to use classes instead of i……