Java
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How do I manage the back buttons for multiple screens in libgdx?
What if there are some ways to manage the back button in libgdx? For example, in andengine, I implemented the followin…… -
Why does JDK also have math Random () and random classes?
Is it just because of the "large API syndrome" or random numbers that are more biased in some cases? If it is... I thi…… -
Java – draw a curved path on canvas?
How to draw a conic or triangular curve (such as sin (x)) on canvas? Solution Most drawing APIs do not provide such fu…… -
Javafx-2 – use JavaFX to check the collision of shapes
I tried to do some collision detection For this test, I use simple rectangular shapes and check their bound to determi…… -
Java – since migrating to spring boot 1.1 4. After release, @ value and application Properties problem
I have a problem because I moved to version 1.1 4. Spring launch of release Variables annotated with @ value have not …… -
Is there an underlying function in the Java – mongodb aggregation framework?
I tried to do some integer math in mongodb and encountered some problems Is there any way to round up or down doubles …… -
Java exception wrapping: bad practice?
From the PHP world, there is only one way to write exception handling I find the exception wrapper in java a little "u…… -
Java – keep the dead line alive
In an interview with me, I raised the following questions (a few years ago) I have argued that there is no way But he …… -
Reading JSON two-dimensional array in Java
Each news item has three contents: title, content and date To retrieve entries from the database, I want to use jsonob…… -
Java library for creating straight skeletons?
I have a 2D polygon with holes as input. I need to find its straight skeleton, as shown in the figure: http://www.cgal…… -
Is there any unordered and repeatable collection class in Java?
See English answers > does Java has multiset data structure like the one in C + + STL? 6 It seems that pool is a su…… -
Java – get the location of the swing component
I put some jpanels into another JPanel, and its layout is @ R_ 987_ 2419 @ layout and y-axis That's what I did, JPanel…… -
Java – is logback mature enough to replace log4j?
I have read similar questions, such as this and this But they're about four years old! In addition, I also read the lo…… -
Servlets – infinite loop when forwarding requests in Java servlets
I hope you can help me solve the problem I face: I created a simple web application using NetBeans Up to now, this is …… -
How to find the date of an object in Java
Suppose I have a class named "test" and I create an instance of this class. Can I know the creation date of this insta…… -
How to replace the missing project . settings . Import the Java project of the classpath file into eclipse
I got a java source code from the opensource project The source code does not have eclipse project specific files, suc…… -
java – org. apache. batik. dom. svg. Where’s svgdomimplementation?
In documentation for batik, it shows how to get the apache. batik. dom. svg. Svgdomimplementation gets an instance of …… -
Database application of Java, JDBC and JPA
I would like to introduce that I am looking for a novice for advice because I am trying to establish good habits The a…… -
Java – can I statically import private subclasses?
I have a private enumeration. Don't expose it outside class Anyway, can I statically import this type so that I don't …… -
Java Apache spark: long conversion chain leads to secondary time
I have a java program that uses Apache spark The most interesting parts of the program are as follows: long seed = Sys…… -
Java – find JDBC datasource in WebSphere 8.5
I want to use JDBC connection in my webapp, which is configured in WebSphere (like here: how to use JDBC in JavaEE?) I…… -
Java byte data type
In the sun tutorial, it says a byte: How does it save memory? What is 2's praise? Solution It saves memory by consumin…… -
Java – HTTP header is used to “accept” httpurlconnection get request
I have read some related questions, but unfortunately they didn't answer my questions because I had specific requireme…… -
Java – is there any way to make SharedPreferences global in my entire Android application?
Is there any way to make SharedPreferences global in my entire application? Now I use these lines in many parts of the…… -
Java – change the shape of the scatter point
I have thousands of points on JfreeChart's scatter chart //* I'm using shapeutilities, but when I use xyitemrenderer /…… -
Java – fileoutputstream: does the “close” method also call “flush”?
I really care about the flush and close methods In my code, I always close my fileoutputstream object But I want to kn…… -
Java – hibernate – forces container resource cleanup when a transaction completes
After several queries are executed, I get the following message from Hibernate: HHH000106: Forcing container resource …… -
Java – use Apache POI to thicken the entire line
I'm using Apache POI's HSSF workbook to write data into an Excel spreadsheet I want a whole line bold Can anyone sugge…… -
Download and write files using retrofit and rxjava
I'm downloading a modified PDF file. The way I download it is block I use the content range header to get a byte range…… -
Java array list problem
I have the following java code, int a[] = new int[] {20,30} ; List lis = Arrays.asList(a) ; System.out.print(lis.conta…… -
Java – how to disable echo when sending terminal commands using Apache commons net telnetclient
So, I have this class using org apache. commons. net. telnet. Telnetclient class It attempts to send a command and rea…… -
Java – what is dot casting?
In this Code: c = (char)(c - 'A' + 'a'); Why do we need a char? Is that foundry right? Suppose that C on the right sid……