Recent questions tagged java

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java - Deleting all the rows in a JTable

I need to remove all the rows in my JTable. I have tried both of the following: /** * Removes all the rows ... remove all the rows. Any ideas? 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 define a custom AuthenticationEntryPoint without XML configuration

I've been struggling for a few days now. I'm kind of new in Spring Boot, and like the idea of not ... custom one that only returns the 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 - P in constant declaration

In java.lang.Double, there are the following constant declarations: public static final double MAX_VALUE = 0x1. ... seen a P 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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java - Why is equals() not called while adding to HashSet and hashCode matches?

When I run this code why only hashCode() is called not equals method while my hashCode() implementation generate ... Hello-hashcode Ho size=1 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 - Log4j2 configuration not found when running standalone application built by shade plugin

I have application which when I run from maven log4j2 it is working: mvn exec:java -Dexec.args=... but ... I just need to specify arguments 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 - Program does not terminate immediately when all ExecutorService tasks are done

I put a bunch of runnable objects into an ExecutorService: // simplified content of main method ExecutorService ... this is normal behavior. 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 do I add an Implementation-Version value to a jar manifest using Maven?

I'd like to add an Implementation-Version line to a manifest in my jar file that reflects the POM version ... jar plugin. 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 - Eclipse Organize Imports Shortcut (Ctrl+Shift+O) is not working

Eclipse used to import missing packages when I press Ctrl+Shift+O. The shortcut key has stopped working when ... snapshots for your reference. 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 - Invalid use of argument matchers

The simple test case below is failing with an exception. org.mockito.exceptions.misusing.InvalidUseOfMatchersException: Invalid ... (dlrBAC); } 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 purge tomcat's cache when deploying a new .war file? Is there a config setting?

I have a simple hello, world servlet application that I am just playing around with, and pushing it out to ... some and havent' gotten anywhere. See Question&Answers more detail:os...

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

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113 views

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java - NoClassDefFoundError when using Powermock

I'm running a junit test case using the PowerMock test runner. I'm using the following command line to execute it: java ... .. How can I fix 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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java - return in for loop or outside loop

Today, someone attended me to bad use of the return keyword in Java. I had written a simple for loop to ... Can somebody give me an explanation? See Question&Answers more detail:os...

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

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476 views

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java - Maven JAR Plugin 3.0.2 Error: You have to use a classifier to attach supplemental artifacts to the project instead of replacing them

Maven JAR plugin (version 3.0.2) keeps throwing the following error, even for a single invocation of the jar goal: ... Maven version is 3.3.9. See Question&Answers more detail:os...

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

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312 views

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java - Delete files older than x days

How can I find out when a file was created using java, as I wish to delete files older than a certain time ... when it is in the above format? See Question&Answers more detail:os...

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

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334 views

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java - Circular View path error Spring boot

I am very new to Spring. I am trying to build a MVC application using Spring Boot which shows a list of ... Also, I am using Eclipse Kepler. See Question&Answers more detail:os...

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

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243 views

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java - Call Main thread from secondary thread in Android

How to call Main thread from secondary thread in Android? 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 - Howto add another test source folder to Maven and compile it to a separate folder?

I have the default src/test/java folder for our unit tests. A separate folder src/integration/java is ... * from the integration phase. See Question&Answers more detail:os...

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

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286 views

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java - Espresso: return boolean if view exists

I am trying to check to see if a view is displayed with Espresso. Here is some pseudo code to show what I am trying: ... ).exists()){ ..... } 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 call getWindow() outside an Activity in Android?

I am trying to organize my code and move repetitive functions to a single class. This line of code works fine ... apply it inside an Activity? See Question&Answers more detail:os...

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

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180 views

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java - How to get biggest BigDecimal value

How can I get the largest possible value of a BigDecimal variable can hold? (Preferably programmatically, ... .valueOf(Double.MAX_VALUE) See Question&Answers more detail:os...

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

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139 views

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java - Declare final variable, but set later

I know this is fairly simple topic, but I really want to wrap my head around it. This is what I' ... Android - Activity Constructor vs onCreate See Question&Answers more detail:os...

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

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506 views

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java - File.mkdir or mkdirs return false - Reason?

Why file.mkdir is returning false? Google indicates that there could be several reasons (e.g. security, ... is SecurityException not thrown? See Question&Answers more detail:os...

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

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136 views

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java - ant depends vs. antcall

When defining sequential build steps I use the depends attribute of the target element. I have recently seen an ... Is one of them preferable? See Question&Answers more detail:os...

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

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901 views

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java - JPA - How to set string column to varchar(max) in DDL

With JPA, DDL-generation for the attribute: @Column final String someString; will be someString varchar(255 ... the columnDefinition-attribute? 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 - How can I parse a date including timezone with Joda Time

This snippet of code always parses the date into the current timezone, and not into the timezone in the string being ... what I'm doing 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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385 views

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java - How can I suppress javac warnings about deprecated api?

When I compile, javac outputs: Note: Some input files use or override a deprecated API. Note: Recompile with -Xlint ... does not seem to 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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199 views

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java - Is it ok to remove newline in Base64 encoding

My java application use base64 encoding which puts a new line ( ) after every 76 character. I need to put ... not introducing a hidden issue. 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 - Cannot start this animator on a detached view! reveal effect

I'm trying to create the reveal effect in my application but without success. What i want is reveal a cardview ... 's the real problem. 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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