Recent questions tagged Java

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java - Why my method being called 3 times after System.in.read() in loop

I have started to learn Java, wrote couple of very easy things, but there is a thing that I don't ... printed only once. Thanks 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 - What does Graphics.setXORMode(Color) do in simple terms?

Here is what I read about it but cant understand exactly what it does: One way to implement rubber-banding is ... . Please elucidate it for me 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 - Code difference between jfreechart XYLineAndShaperanderer, XYDotRenderer and XYSplineRenderer?

I'm trying to create simple XYSplineRenderer, but code only work if I write XYDotRenderer a = new XYDotRenderer( ... then I created new project. 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 useDelimiter() to join substrings

My method readDataFromFile() can read text files like: Bird Golden Eagle Eddie Mammal Tiger Tommy Mammal Lion Leo Bird ... name, 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 - Getting HTTP 500 when running servlet in Jetty

I have a servlet that was running fine until a few days ago. But the only thing that I've ... Problem accessing /. Reason: SERVICE_UNAVAILABLE 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 does my encrypted string looks like consisting of only question marks?

I'm encrypting a string in Java, and when I'm printing the encrypted data, I see only question marks. As an ... can I see only question marks? 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 Error while persisting TEXT datatype

Using hibernate and mysql 5.5, I am trying to persist String value in TEXT type column of ... .hibernate.engine.jdbc.BlobProxy@11e84b60" 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 - Send Images as Multipart with Other Params in Volley Request

I was sending a request to the server with two parameters using volley request and it was working fine. Now ... volley request. 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 - How to prevent JComboBox from becoming unresponsive when using a custom ListCellRenderer

I am making a font chooser using JComboBox and a custom ListCellRenderer. I want the JComboBox to display ... one prevent this unresponsiveness? 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 - KeyListener doesn't work when I add button to Jpanel

I found that, when I write "pnlMap.add(map[i][j])" keylistener won't work. map is set of JButton, pnlMap is JPanel. ... .add(map[i][j]); } } } 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 - KeyListener not working (requestFocus not fixing it)

I am trying to make my first game without the help a youtube video. I have watched many youtube series about making java ... = x ++; } } } 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 get SelectableChannel from an InputStream?

I want to read from an java.io.InputStream with a timeout. Apparently the correct way to do this ... /javax/comm/CommPort.html#getInputStream() 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 - Not able to open connection from PgBouncer (Connection attempt timed out)

We are using PgBouncer as the middle ware for connection pooling for our spring-based application. Within the ... (HikariPool.java:309) at 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 does input.nextint method have a as a leftover?

In the answer to this question I don't understand why the input.nextInt has a newline character as a leftover. ... () or other nextFoo()? 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 boot ConditionalOnBean annotation

There are spring boot 2.0.2 configuration @Configuration public class ApiConfig { @Bean @Profile("!tests") ... to @RestController? 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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223 views

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java - Simple Application using JNDI and DataSource without Server, ServiceUnavailableException, ConnectException

I'm reading about JNDI and DataSource. https://www.journaldev.com/2509/java-datasource-jdbc-datasource-example https:// ... .. 8 more $ 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

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java - JSF 2.0 Forbid calling action after failed validation in actionListener

I have a dialog for adding some data: <p:commandButton id="save" actionListener="#{adminNationalController. ... posible forbid calling action? See Question&Answers more detail:os...

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

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188 views

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java - Not able to invoke an @DELETE web service in REST/JERSEY

I am using Jersey Framework (JAX-RS implementation) for building RESTful Web Services. I'm not able to use the ... me on how to resolve 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 - JNA - Query Windows Processes

I'm trying to use JNA to return details on a specific Windows Process. Not exactly sure how to do this. ... winNT.CloseHandle(snapshot); } } 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't figure out error with ActionListener

The following is my program. the goal is to convert from a roman numeral to an Arabic number after a ... }//end inner class TextAreaHandler See Question&Answers more detail:os...

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

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268 views

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java - Incompatible types error with Fragments

I'm trying to add a fragment to my main activity. When I type fragment = new CrimeFragment(); I get an ... How do I fix this 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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182 views

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java - Retrieving data from firebase

I keep getting the stacktrace error below each time I implement GenericTypeIndicator<List<String>> t = new ... NativeStart.main(Native Method) 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 does Eclipse know that com.sun is a restricted API?

I'm using ClassPath.getAllClasses from Guava to find in runtime classes that implement a certain interface. When ... or hardcoded into Eclipse? 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 bytecode calls Object->getClass() at a direct field access

I decompiled Java (actually Dalvik) bytecode. In the beginning of a method, I access a field of an instance member ... = mAge; } } } 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 - GridBagLayout cant get layout right

I'm new to GridBagLayout but I tried to use the standard convention that I could find which was to draw out ... (but please explain your logic) See Question&Answers more detail:os...

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

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332 views

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java - No cached version of com.android.tools.build:aapt2:3.2.0-alpha18-4804415 available for offline mode

Using android 3.2 canary 18 and getting this error: No cached version of com.android.tools.build:aapt2:3.2.0- ... is deleted 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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263 views

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java - Detect current screen bounds

I am working on an application that has setDecoration(false) and I have a MouseMotionlistener so I can move ... vertical instead of horizontal. See Question&Answers more detail:os...

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

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254 views

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java - Setting locales in gwt.xml do not work

In my module xml file I have this: <module rename-to="UIGenerator"> <inherits name="com.google.gwt.http.HTTP" ... others! 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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