Java
-
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 -
Java transformation
Including upward transformation and downward transformation Upward transformation @ h_ 301_ 6@ -
-
How to quickly create millions of test data
scene During SQL optimization or query performance test, we need a lot of data test to simulate. At this time, a probl…… -
A large number of GCs in the company’s online virtual machines have led to a surge in STW and CPU — a process of cocooning and positioning
background There is a Tomcat service on the company's online, in which about 8 microservices are merged and deployed. …… -
Application of Java this
package java04; public class DemoPersom2 { public static void main(String[] args) { Person2 person = …… -
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 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 – 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 – 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 – 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…… -
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 – how do I get the start and end ranges from the timestamp list?
I have such a timestamp string: 2016-01-14T22:43:55Z 2016-01-15T00:04:50Z 2016-01-15T00:44:59+08:30 2016-01-15T01:25:3…… -
Java – use jinternalframe and some buttons
Can we use jinternalfame with buttons in the main frame? Of course, the framework contains jdesktopane How about this …… -
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…… -
Java – what is the best practice for rounding floating point numbers to 2 decimal places?
See English answers > how to round a number to N decimal places in Java 29 I need to round the floating point value…… -
How to add shortcut keys to JButton in Java?
I have a JButton and I want to assign a shortcut to it Just like I press delete it on the keyboard, just click JButton…… -
Java – how to insert objects in an ArrayList at a specific location
Suppose I have an ArrayList of an object of size n Now I want to insert another object at a specific location, assumin…… -
Java splits strings into arrays
See English answers > java string split removed empty values 6 String values = "0|0|0|1|||0|1|0|||"; I need to put …… -
How to add rows and columns to JavaFX 8 tableview
I saw an example of adding rows to tableview on the Internet, such as using the person class in Oracle documentation B…… -
Erlang processes and Java threads
I'm reading "elixir in action" book by SA š a Juri ć, And in the first chapter: Isn't that true for Java threads? I me……