Recent questions tagged Java

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java - How to enable debug in slf4j Logger?

How to globally enable debug for all the slf4j.Logger objects? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Using request.getRemoteAddr() returns 0:0:0:0:0:0:0:1

I am trying to print the IP adress of the logged user in my webApplication. If a user connects from another PC ( ... use?).Thank you a lot! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Cannot perform instanceof check against parameterized type ArrayList<Foo>

The following code: ((tempVar instanceof ArrayList<Foo>) ? tempVar : null); causes: Cannot perform instanceof check ... and how to fix this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to suppress all checks for a file in Checkstyle?

I'm doing an override for a third party class and I want to suppress all checks for it (since I'm only ... tried using "*" but that fails. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How instanceof will work on an interface

instanceof can be used to test if an object is a direct or descended instance of a given class. ... anyone explain how instanceof works? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Returning a value from Runnable

The run method of Runnable has return type void and cannot return a value. I wonder however if there is any ... in method. Is this possible? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Replace all double quotes within String

I am retrieving data from a database, where the field contains a String with HTML data. I want to replace all ... or something that I could use? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Display classes containing deprecation Android Studio

I updated my project to the latest Android APIs and the project now has multiple deprecated methods. Does Android ... make it easy on myself. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - IntelliJ IDEA Render error

I'm trying to set up IntelliJ IDEA for programming android but I can't render the main.xml. org.jetbrains. ... t know what's happening here. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Why is my onResume being called twice?

Basically, this is what I'm doing 1) Set AlarmManager to execute BroadcastReceiver (BCR) Intent intent = new ... this behavior can be prevented? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How can I know if Object is String type object?

I have to know if Object is String or any other class type, how can I do it? Currently I do it like below ... wasn't string, so just continue } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Difference between @Size, @Length and @Column(length=value) when using JPA and Hibernate

What is the difference between the validation check of the following three fields? @Entity public class MyEntity { ... one suits your purposes? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - BigDecimal to string

I have a BigDecimal object and i want to convert it to string. The problem is that my value got fraction and ... the number 10.0001 in string See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Getting error when trying to run new project in Android Studio 2.2.1

I just updated to Android Studio 2.2.1 for Mac. Then I updated the JDK to version 8. Tried to start a new ... for Mac. still got the same error. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Use the serialVersionUID or suppress warnings?

I want to create a class that, for example, extends HttpServlet? My compiler warns me that my class should have a ... What would you do and why? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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239 views

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java - long timestamp to LocalDateTime

I have a long timestamp 1499070300 (equivalent to Mon, 03 Jul 2017 16:25:00 +0800) but when I convert it ... TimeZone .getDefault().toZoneId()); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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170 views

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java - What's the point of Guava checkNotNull

I'm pretty new to Guava (let's be honest, I'm not "pretty new", I'm a complete rookie on that subject ... must be missing something. What is it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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172 views

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java - Spring @Value is not resolving to value from property file

I've had this working in some other project before, I am just re-doing the same thing but for some ... inside the properties file. Thoughts? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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502 views

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java - Method argument extends class implements interface

I have the following class and interface: public class BasicObject{...} public interface CodeObject{...} I want to ... CodeObject> clazz){...} See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to chain two Completable in RxJava2

I have two Completable. I would like to do following scenario: If first Completable gets to onComplete , continue with ... login(password, s)) } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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382 views

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java - Listing files in a specific "folder" of a AWS S3 bucket

I need to list all files contained in a certain folder contained in my S3 bucket. The folder structure ... directory, excluding sub-directories. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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123 views

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java - How do you get the length of a list in the JSF expression language?

How would I get the length of an ArrayList using a JSF EL expression? #{MyBean.somelist.length} does not work. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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404 views

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java - Cosine Similarity

I calculated tf/idf values of two documents. The following are the tf/idf values: 1.txt 0.0 0.5 2.txt ... should have same number of words? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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224 views

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java - Is it possible to generate reports dynamically using Jasper Reports without generating a jasper for each report?

I have to generate reports based on various parameters which would be provided dynamically. In certain contexts, the ... produced in the report? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Can @Resource be used to inject primitives in EJB3.0?

Using Glassfish, I can setup a string jndi entry: JNDI name: "com/xyzcompany/echo/EchoServiceBean/viewName" ... does the mapping. Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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301 views

1 answer

java - How to fix circle and rectangle overlap in collision response?

Since in the digital world a real collision almost never happens, we will always have a situation where the " ... the functions A and B. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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197 views

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java - Implementing a Patricia Trie for use as a dictionary

I'm attempting to implement a Patricia Trie with the methods addWord(), isWord(), and isPrefix() as a means ... and how would you implement it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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206 views

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java - Fast loading and drawing of RGB data in BufferedImage

In some Java code running on Windows, I'm reading some large blocks of RGB data from disk and want to ... ColorModel, Raster stuff. Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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