Recent questions tagged Java

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java - How to identify square or rectangle with variable lengths and width by using javacv?

I'm developing project using java to identify components using opencv package but I'm new to javacv and I just ... one help to accomplish 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 - deep copying a graph structure

I have a graph class with Node's, where each Node can connect to others: public class Node { List<Node> ... this in a simple way? 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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java - Is it better to use a TreeSet or ArrayList when using a custom comparator

I have implemented a graph. I want to sort a given subset of vertices with respect to their degrees. Therefore, ... if it is more efficient. 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 - Encryption with AES-256 and the Initialization Vector

I have a question relating to the use of an Initialization Vector in AES encryption. I am referencing the following ... . Thank you in advance. 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 - Jackson: parse custom offset date time

I have a model which has a timestamp property: class Model { @JsonProperty("timestamp") private OffsetDateTime timestamp; ... can I 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 Access package private Class from a Class in some other package?

I have following classses Hello.java package speak.hello; import java.util.Map; import speak.hi.CustomMap; ... as requested by @StephenC 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 code a server/client video and audio streaming application?

I have to create a client/server system to stream video and audio. It would be very simple. Like youtube ... clarify my ideas. Kind regards. 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 make ThreadPoolExecutor command wait if there's too much data it needs to work on?

I am getting data from a queue server and I need to process it and send an acknowledgement. Something like this: ... queue is full of 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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java - How to install android market on emulator for all api's

How can I install android market and other apk's on the android emulator. I tried some solutions, but they don't seem to work, or are unclear. 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 - Android -- How does Google+ instant upload work?

I was playing around with the new Google+ application on the Android and I had a technical question that I ... are greatly appreciated! 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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java - Type parameter vs unbounded wildcard

From Effective Java Chapter 5 (generics): // Two possible declarations for the swap method public static <E> ... second is recommended? 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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java - Using two (or more) objects as a HashMap key

I want to store certain objects in a HashMap. The problem is, usually you just use a single object as a key ... and clean way to implement that? 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 - CellTable with custom Header containing SearchBox and Focus Problem

I am trying to implement a CellTable with a custom Column Header which displays a SearchBox (simple ... (searchTerm,searchUpdater)); 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 - About reference to object before object's constructor is finished

Every one of you know about this feature of JMM, that sometimes reference to object could receive value before ... fields of f are final? 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 - Do we ever need to use Iterators on ArrayList?

Yesterday, when I was answering to question getting ConcurrentModificationException error while using iterator and remove ... using Iterator. 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 - Encryption using AES-128 in Android and IPhone (Different result)

I am trying to encrypt some text using the AES algorithm on both the Android and IPhone platforms. My problem ... between .Net and iPhone? 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 - Android camera2 capture burst is too slow

I am trying to modify the android-Camera2Basic code to capture a burst of pictures. However, I can't get the delay ... 10) unlockFocus(); } }; 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 - What is the point of Authentication tokens on REST services

What is the value of using a authentication token when using a REST webservice instead of sending a username, ... is the real value 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 - Write log file using org.apache.commons.logging

I'm writing an application where I need to write log to a file using org.apache.commons.logging library, but i ... me? Thanks & best regards. 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 - Streaming XPath evaluation

Are there any production-ready libraries for streaming XPath expressions evaluation against provided xml-document? ... xpath expression. 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 - Spring scheduler shutdown error

During development a SPRING based scheduler in a tomcat container, I always get this logoutput at undeploy webapp or ... </property> </bean> 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 - Memory consumed by a thread

I need to monitor the amount of memory consumed by threads spawned by my application. The idea is to take corrective ... ().runDummyJobs(); } } 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 - Hibernate: Cascade Type

Let's I have entity A and entity B. Entity A have @OneToOne relationship with B. I want do next: if I ... (cascade = {CascadeType.ALL}) ? 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 - Hotspot JIT optimizations

In a lecture about JIT in Hotspot I want to give as many examples as possible of the specific optimizations that ... a vote for every example. 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 - LinkedList: remove an object

Is this a valid way to find and remove item from a LinkedList in Java using a for each loop, is it possible ... obList.remove(ob); break; } } 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 Spring Security with JPA

I am new to Spring. We are using spring security feature. Database connectivity: eclipselink implementation of JPA. ... Thank you in advance. 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 - Spring data and mongodb - simple roll back with spring within @Transactional

I have 2 repositories, one for mongodb (DocumentRepository) and the other for hibernate entity (EntityRepository ... (Transactional annotation) 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 Flying Saucer to Render Images to PDF In Memory

I'm using Flying Saucer to convert XHTML to a PDF document. I've gotten the code to work with just basic HTML ... for any help you can provide! See Question&Answers more detail:os...

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

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