Recent questions tagged JAVA

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java - How to detect when the Battery's low : Android?

I want to close my app when the battery level of the device gets low. I have added following codes in ... missing? Any help 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 - Using ConcurrentHashMap, when is synchronizing necessary?

I have a ConcurrentHashMap where I do the following: sequences = new ConcurrentHashMap<Class<?>, AtomicLong>(); if( ... I think it is necessary. 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 imageview.setBackgroundResource() doesn't work

I have an imageview that should be changed on click public class Settings extends Activity implements OnClickListener { ... by xml layout file 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 tell ant to build using a specific javac executable?

How can I tell ant to use a specific javac executable from the command line? I have an installation of gcj, ... "well-behaved" in some sense. 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 - When is an OSGi fragment attached to host?

I have an OSGi bundle with persistence service (using hibernate) and a fragment, which contains configuration (xml ... Felix. auto.start level. 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 generate classes from XSD that implements serializable?

I need to generate many classes from my XML Schema (XSD) in a package (.jar). How can I configure these classes ... I'm using Eclipse and JAX-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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java - Is volatile read happens-before volatile write?

I try to understand why this example is a correctly synchronized program: a - volatile Thread1: x=a Thread2: a=5 ... 1 happens-before 2, 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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java - Creating tray icon using JavaFX

I want to write a tray icon via JavaFx, but I only find that can write by awt. Is there any way that ... like these tray icons from Windows 10: 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 - swagger date field vs date-time field

I am using swagger to test my rest api, one of the property of my entity class is a date ... /swagger-swaggersocket/ChiknyHZiP4 Please help. 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 - Usage of ?android:attr/ in backwards compatible apps

I'm trying to make my ICS (API level 15) app compatible with Gingerbread (API level 10), ... /dividerVertical ?android:attr/dividerHorizontal See Question&Answers more detail:os...

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

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494 views

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java - Point eclipse IDE to use another JRE / JDK other than one specified in JAVA_HOME

I am having two JRE / SDK in my development environment, however it was necessary in my situation to set ... my other 1.6 installation? 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 should I include a gradle dependency as `@aar`

Why should (or shouldnt) I include a gradle dependency as @aar, What are the benefits/drawbacks if any? As you ... :licensesdialog:1.7.0@aar' } 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 - Does the JVM have the ability to detect opportunities for parallelization?

The Java Hotspot can optimize the sequential code very well. But I was guessing that with the advent of multi-core ... is very hard to solve? See Question&Answers more detail:os...

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

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505 views

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java - Is String Deduplication feature of the G1 garbage collector enabled by default?

JEP 192: String Deduplication in G1 implemented in Java 8 Update 20 added the new String deduplication feature: Reduce ... Shipilev at 29:00. 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 @OneToOne @NotNull

Is it valid to declare @OneToOne and @NotNull on both sides of a relationship, such as: class ChangeEntry { ... both sides must be present. See Question&Answers more detail:os...

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

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221 views

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java - Deep Copy in JPA

I would like to make a deep copy of an entity in JPA. I found an interesting discussion here: http://forums. ... that they can share??? 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 - Understanding join() method example

The Java thread join() method confuses me a bit. I have following example class MyThread extends Thread { ... order are the threads terminated? 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 - Multiple version of dependencies in Gradle

i'm building a java project, using gradle for version control. I'm migrating from an old version of the ... versions of the same library? See Question&Answers more detail:os...

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

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265 views

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java - Is Concurrent Mark Sweep (CMS) a stop the world event?

I see many unloading of classes and my entire system will hang during that period of time.. [Unloading class sun. ... perm space is not full? 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 read properties file in spring project?

Before post this Question, I google to get Properties from Spring project(Its NOT web-based project). I ... define the application-context.xml See Question&Answers more detail:os...

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

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159 views

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java - permutations of a string using iteration

I'm trying to find permutation of a given string, but I want to use iteration. The recursive solution I found online ... .out.println(temp); } } See Question&Answers more detail:os...

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

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225 views

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java - Program output lost when passed through PsExec

(This is a question my coworker posted elsewhere, but I thought I'd post it here to see if I could hit a ... of input: Test END INPUT RECIEVED See Question&Answers more detail:os...

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

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426 views

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java - swt browser No more handles Error

I wrote a simple program. just a CTabFolder and a WelcomTab inherent from CTabItem. I want to fill my ... gain handle from Operation System See Question&Answers more detail:os...

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

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606 views

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java - Signature trust establishment failed for SAML metadata entry

In order to fetch metadata from a remote source, I defined an ExtendedMetadataDelegate bean as follows: @Bean ... Certification Authority)"); 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 - Drools Rule depending on Knowledge from JDK Map (not within non-JDK Class)

I'm trying to write the below Rule, which depends on Knowledge provided in the below main that uses just a ... message below. What is wrong? See Question&Answers more detail:os...

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

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250 views

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java - What's the difference between Stream.map(...) and Collectors.mapping(...)?

I've noticed many functionalities exposed in Stream are apparently duplicated in Collectors, such as Stream.map( ... they can be parallelized? See Question&Answers more detail:os...

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

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296 views

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java - JSF initialize application-scope bean when context initialized

I'm building a JSF+Facelets web app, one piece of which is a method that scans a directory every so ... bean initialized on web app startup? See Question&Answers more detail:os...

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

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336 views

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java - can't delete file from external storage in android programmatically

I am trying to delete a file located at the path /storage/714D-160A/Xender/image/Screenshot_commando.png What ... android.permission.STORAGE" /> See Question&Answers more detail:os...

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

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