Java
-
Java class set framework map
Each element in the map contains a key object and a value object. Keys cannot be repeated and values can be repeated O…… -
-
-
-
Subclass instantiation super
Super calls the parent class construction, which must be written in the first line Call other constructs of the parent…… -
-
-
-
Summary of problems in upgrading JDK from old version to 1.8
Jdk8 upgrade FAQ JDK environment settings in IntelliJ Settings Click File > Settings > java compiler Select 1.8 …… -
Java class set framework
The objects in the collection are not sorted in a specific way, and there are no duplicate objects Operation results -
Application of Java this
package java04; public class DemoPersom2 { public static void main(String[] args) { Person2 person = …… -
Java – how to expand the page size of PDF to add watermark?
My web application signs PDF documents I want users to download the original PDF document (unsigned), but add an image…… -
Java – my Jasper template does not display text
I'm not sure why if I run my sample template, I can't see any text <?xml version="1.0"?> <jasperReport xm…… -
Java – swingworker is in the done method of another swingworker
First, I need to inform you that I'm trying to learn how to write code in Java It's a little difficult, but I believe …… -
Multithreading – JavaFX uses threads and GUI
There was a problem using JavaFX and threads Basically, I have two choices: use tasks or platform runLater. As far as …… -
Java – the specified DSN contains an architecture mismatch error
I received this error: An error occurred while trying to connect to the database using NetBeans and the Java programmi…… -
Can (a = = 1 \ u0026 \ u0026 a = = 2 \ u0026 \ u0026 a = = 3) be evaluated as true in Java?
We know it can in JavaScript. But is it possible to print a "success" message under the conditions given below in Java…… -
Java – Android flood filling algorithm
Who knows an iterative and effective flood filling algorithm? Or is there a way to implement recursive filling algorit…… -
Java – hibernate sequence does not exist
I tried to upgrade hibernate from 4 to 5.0 in my project using spring version 4.2 After upgrading, when I call the upd…… -
Java array, NullPointerException?
I declare two cards: Card card1 = new Card('3',Card.Suit.clubs); Card card2 = new Card('T',Card.Suit.diamonds); This w…… -
The java socket swingworker is running but has not received or transmitted a message
A few days ago, I tried to create a server - client or client server as an experiment to learn about sockets using thr…… -
Java – remove duplicate values from ArrayList
I have a string ArrayList in which I add some duplicate values I just want to delete duplicate values, so how to delet…… -
Java – sort rows by column in JTable
When you click a column heading on JTable, it sorts the rows alphabetically This applies to all my columns except one …… -
Java – the right way to update images using jlabels
I'm creating a GUI, and it's a fairly new swing and AWT I'm trying to create a GUI, set the background as an image at …… -
Java – this view is not constrained
I received the following error, I used Android studio 2.2 preview 3 I searched Google but couldn't find any resources …… -
Java – Android gets the date 7 days ago (one week)
How to get the date in android in this format within the previous week: SimpleDateFormat dateFormat = new SimpleDateFo…… -
Java – face recognition API
Using Java and Android, I tried to find a way to recognize faces with a given picture of the camera Any ideas? Does an…… -
Java – what is a stack mapping framework
I've been paying attention to Java virtual machine specifications (JVMs) recently, trying to better understand how my …… -
java – Google Guava vs. Apache Commons
I was looking for a bidirectional map implementation in Java and came across these two libraries: >Google guava (fo…… -
Java – minimize the jinternal framework without clicking a button
Is there any way to minimize / maximize jinternalframe without clicking the minimize / maximize button in the upper ri…… -
Java keylistener and keybinding
I want to write a calculator and have a problem I have created an action listener for all buttons, and now I want to b…… -
Javafx-8 – launching a JavaFX application from another class
I need to start a JavaFX application from another "container" class and call the function on the application, but ther……