Recent questions tagged Java

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java - Array of objects vs Object of Objects

The issue is to decided the trade offs between following notations: JSON based: "users": { "id1": ... or scalability is appreciated. 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 uninstall plugins in Eclipse 3.4.X or higher

The GUI for managing plugins in Eclipse got a bit of an overhaul in version 3.4.0. This GUI is accessed via ... with an option to remove them? 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 find an element with an ID in JavaFX?

I have an element with the ID history type of TableView. How can I find and access this object if I have the instance of Scene scene? 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 - Watching variables contents in Eclipse IDE

How can I watch the contents of several variables (for example, TreeSet's) simultaneously? I can watch contents ... that for several variables. 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 determine if the column name exist in the ResultSet?

As the ResultSet contains the data returned from the dynamic SQL, if there are any method to determine if the ... a column named "Column_ABC"? See Question&Answers more detail:os...

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

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311 views

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java - Table 'DBNAME.hibernate_sequence' doesn't exist

I have a SpringBoot 2.0.1.RELEASE application using spring data / jpa <dependency> <groupId>org.springframework.boot</ ... DB to fetch the ID . 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 - Eclipse Juno No Debug Toolbar?

I just upgraded to Eclipse Juno but I found there is no debug toolbar (Resume/Step into/Step over/Stop etc. ... Thanks! In the previous version: 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 implement an audio player for Android using MediaPlayer And MediaController?

I want to create an Android application that is a client for an Internet radio station. And I want it look ... .setData(u); startActivity(i); 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 - Tuning JVM (GC) for high responsive server application

I am running an application server on Linux 64bit with 8 core CPUs and 6 GB memory. The server must be highly ... place more often? and how? 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 - Superclass reference to subclass object showing same behaviour as subclass reference to subclass object

The following code in java, when run on elipse, gives same output even if we replace superclass s=new sub() ... its behavior in sub classes? See Question&Answers more detail:os...

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

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130 views

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java - Finding Points contained in a Path in Android

Is there a reason that they decided not to add the contains method (for Path) in Android? I'm wanting to ... way I should go about 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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364 views

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java - HowTo use https / ssl with Maven/Mortbay Jetty Plugin?

I would like to use ssl / https as described in http://docs.codehaus.org/display/JETTY/How+to+ ... .PKCS12Import jetty.pkcs12 keystore). See Question&Answers more detail:os...

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

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171 views

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java - Are static fields in Activity classes guaranteed to outlive a create/destroy cycle?

I frequently run into the problem that I have to preserve state between several invocations of an activity (i ... referencing an object before? 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 - print all root to leaf paths in a binary tree

i am trying to print all root to leaf paths in a binary tree using java. public void printAllRootToLeafPaths(Node node ... one figure it out... See Question&Answers more detail:os...

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

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270 views

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java - WebServices : bare vs wrapped?

I generate some WebServices out of some existing wsdl I use Maven to do this but some webservices are generated ... differences in the wsdls... See Question&Answers more detail:os...

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

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192 views

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java - How to save application options before exit?

I have made an application and i need to save some options before exit.(something like window dimension, ... ... exiting of course) 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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229 views

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java - Delete child from parent and parent from child automatically with JPA annotations

Suppose that we have 3 Entities object class: class Parent { String name; List<Child> children; } class Child { ... and mysql 5.1.30. 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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256 views

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java - Avoid Deadlock example

I am wondering what are the alternative ways to avoid deadlock in the following example. The following example is a ... { to.deposit(amount); } See Question&Answers more detail:os...

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

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166 views

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java - Is there a way to reuse builder code for retrofit

I am using Retrofit and in every task I have to do something like this: public class MyTask extends AsyncTask<String ... to make this code DRY? See Question&Answers more detail:os...

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

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258 views

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java - Performance of HashMap with different initial capacity and load factor

Here is my situation. I am using two java.util.HashMap to store some frequently used data in a Java web app ... completely open to that as well. See Question&Answers more detail:os...

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

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181 views

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java - Taking thread dumps in production

I am analyzing the differences between approaches for taking thread dumps. Below are the couple of them I am ... do it manually as required. See Question&Answers more detail:os...

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

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277 views

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java - What's the best way to define the words "class" and "object" to someone who hasn't used them?

My neighbor is taking "Intro to Java", and asked me to help explain a few of the first-day concepts. ... subjective; marked as community wiki.) See Question&Answers more detail:os...

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

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132 views

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java - Adding all Maven dependencies to Arquillian

How do you add all dependencies in the POM to arquillian? Maven.resolver().loadPomFromFile("pom.xml"). ... are there better ways? See Question&Answers more detail:os...

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

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175 views

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java - How do I run Firebug within Selenium WebDriver (Selenium 2)?

What's the best way to activate Firebug in Firefox when running Selenium 2? Edit: Ok, I realize "best" ... better until proved worse ;) See Question&Answers more detail:os...

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

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213 views

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java - Is Dalvik even more memory hungry than HotSpot in terms of object sizes?

I've been wondering how much memory does an Object occupy on Android. There are numerous resources (like this ... bytes compared to HotSpot? See Question&Answers more detail:os...

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

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317 views

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java - Configure embedded jetty with web.xml?

I am trying to generate both a war with my web application as well as a self contained jar file with embedded ... file from the embedded jetty? See Question&Answers more detail:os...

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

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122 views

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java - Update a file inside a JAR in a specific directory with jar command

So I've been looking high and low for an answer to this and obviously haven't found a satisfactory answer. ... on this is greatly appreciated! See Question&Answers more detail:os...

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

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127 views

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java - What is the point of using abstract methods?

What's the point of using "abstract methods"? An abstract class cannot be instantiated, but what about the abstract ... didn't find an answer. See Question&Answers more detail:os...

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

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