Java
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Java ternary compared with large objects
Ternary operators are usually just a topic of philosophical discussion: a=b>5?1:0; More readable, faster, cooler if…… -
Java interrupts or exits a thread
I have a thread that performs several different tasks Each task depends on the success of the previous task If this is…… -
Inheriting a class without a parent type in Java
How do I inherit from other classes without using a parent type? For example, I hope that car can adopt all methods an…… -
Java chess: not sure how to clone correctly
I am writing a basic java chess game and have written the following classes: game, player, chessboard, square, pieces …… -
How do I convert UTC date strings and delete T and Z in Java?
I am using java 1.7 Attempt to convert: 2018-05-23T23:18:31.000Z become 2018-05-23 23:18:31 Dateutils class: public cl…… -
Is it correct to infer that the default method is used in the interface to make it like an abstract class in Java?
Since we now have default methods in the interface, is it more like an abstract class using both abstract and non abst…… -
Java – when we call a static final variable, why not execute the static block first
See English answers > static block in Java not executed class Test4 { public static void main(String as[]) { …… -
Java – spring boot with bluemix error: no buildpacks detected a compatible application
pace: >Use start spring. IO create a new project > run it locally – work > run gradle task jar > push jar …… -
The pre constructor initializes the properties of variables in Java
In Java, you can initialize programming variables before calling constructors public class StockGraph extends JPanel {…… -
Java – collect results from parallel streams
I have a code like this: List<Egg> eggs = hens.parallelStream().map(hen -> { ArrayList<Egg> eggs = …… -
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 – why does a new string with UTF-8 contain more bytes
byte bytes[] = new byte[16]; byte bytes[] = new byte[16]; random.nextBytes(bytes); try { return new String(bytes,"U…… -
Model view controller – JavaFX includes fxml in fxml without controller
I am writing an application using JavaFX My scenario is defined in different fxml files Because I tried to use MVC mod…… -
Java Stream Collectors. Tolist() does not compile
Anyone can explain why the following code can't be compiled, but what about the second code? Do not compile private vo…… -
Java-8 – optional, do not handle null elements
When I experiment with optional < T >, I do not process null elements, so in the following example, it throws Nu…… -
How to add a scrollbar in JavaFX
I'm trying to add a scrollbar to H@R_869_2419 @Yes Scrollbar was added, but I didn't scroll How can I make it work? pu…… -
Java – get all rejected additions to set
I'm not very good at hashsets. I want to know if I can use them The addall method retrieves duplicates deleted by hash…… -
After adding the default method in Java 1.8, does the interface remain completely abstract?
After adding the default method in Java 1.8, does the interface remain completely abstract? I'm sorry if I can't state…… -
The list of Java objects is sorted by specific objects, not by
I have the following jsonarray trying to sort it So, to convert my jsonarray to ArrayList, then sort them and convert …… -
Cannot add an object of type T to the list in Java
I've been learning generics in Java Although I understand the concepts of type inference, parameterized classes and me…… -
Java – Android retro fit: missing method body or declaration abstraction
I'm writing an Android application that will use retrofit to make API requests I have such a helper class: public clas…… -
Java – boxed Boolean equivalent
Quick question: are you sure this code is always true? Boolean b1 = true; Boolean b2 = true; System.out.println(b1 == …… -
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…… -
How to initialize 2D string array in Java
I know how to declare arrays. I've done this: String[][] board1 = new String[10][10]; Now I want to do this. By defaul…… -
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 …… -
Lambda – iterates over two lists using a Java 8 stream
How do I write the following in a Java 8 stream? int total = 0; for (ObjectA obja : rootObj.getListA()) { for (O…… -
How to make Java wait for user input
I'm trying to make an IRC robot for my channel I hope the robot can get commands from the console In order to make the…… -
Java – why is the difference between specific dates (03 / 12 / 2018) not the exact number of days?
I'm facing a strange problem with Java (versions 6, 7, 8) In this code, I try to calculate the date difference between…… -
Java – spring data JPA cannot be configured: the specified class is an interface
I have started using spring data JPA Unfortunately, I can't configure it I have entity class and repository interface,…… -
How to create a string representing Java as if it were an unsigned 64 bit value
My component was passed a long value, which I later used as a key in the cache The key itself is a string representati…… -
The Java iterator gets the next one without incrementing
I write the following loop in Java for each loop that I want to access the current and next elements of the link list ……