Recent questions tagged Java

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java - Why Invalid conversion requested ERROR CODE: 17132?

I am trying to get last inserted row id while inserting using JDBC prepared statements. I have an auto increment ... PRIMARY KEY(MEETING_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 - Creating a File from byte array

So - I've got a third party library that needs a File as input. I've got a byte array. I don't want ... byte array (without writing to disk)? 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 make JTable column contain checkboxes?

Preface: I am horrible with java, and worse with java ui components. I have found several different tutorials ... 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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java - JSF 2 : Is it possible to inherit @ManagedBean?

I have a Bean ,with a @ManagedBean annotation, defined like this : @ManagedBean @SessionScoped public class Bean ... a managed 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 - Eclipse doesn't find javax.swing

Eclipse cant find the import javax.swing.JOptionPane Where is it located and how can i include it? import javax.swing.JOptionPane; See Question&Answers more detail:os...

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

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313 views

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java - When is there need for Some<E extends Some<E>> instead of Some<E extends Some>?

NOTE: This question is not Enum-related, so it's not duplicate. Enum's are forced to compare only-with-itself ... Animal with Cat, not itself. 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 - Maven: lifecycle phase to run a program?

I can use Maven to compile and test a program mvn compile mvn test Is there a lifecycle command to simply run ... which will run the program? 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 - Fabric/Crashlytics NoClassDefFoundError only on certain devices

I'm seeing a crash in Google Play related to Fabric/Crashlytics. This happened after I updated from ... .handleMessage(ActivityThread.java:1297) at android.os.Handler.dispatchM...

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

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java - Difference between requestFocusInWindow() and grabFocus() in Swing

I would like to know the difference between requestFocusInWindow() and grabFocus() methods. Both of them work fine for grabbing ... ; } }); } } 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 - Multi-Threading error when binding a StringProperty

I have a question about multi-threading and the binding of a StringProperty. I have a class CacheManager, ... help 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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394 views

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java - How do I remove white-space from the beginning of a string?

How do I remove white-space from the beginning of a string in Java without removing from the end? If ... whitespace value is reached. 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 - How to determine an incoming connection is from local machine

I have a SocketServer accepting incoming connections. For security reasons I should only allow local connections ( ... } Thanks, Mohsen See Question&Answers more detail:os...

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

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478 views

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java - checking if a point is inside a specified Rectangle

ok, so i'm doing an assignment for a Java class and one part of the assignment is to find out if a ... with some GUI or graphics programming. See Question&Answers more detail:os...

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

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445 views

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java - Android - Can you update a Cursor for SQLite results?

One of my methods returns a Cursor from some SQLite query results. As I'm navigating through the cursor, there ... record ID from the cursor? See Question&Answers more detail:os...

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

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409 views

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java - setTextViewText not updating widget

Shown below is a simplified version of my class. I am having trouble in the onReceive method which isn't updating ... (context, intent); } } See Question&Answers more detail:os...

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

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521 views

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java - Load a font from JAR for FOP

I have a TTF font in fonts directory in the JAR with my application. myapp.jar / fop / config.xml font.ttf I ... in the PDF file I am rendering? See Question&Answers more detail:os...

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

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401 views

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java - CardView setCardBackgroundColor won't work

I have made an adapter of CardView through the RecyclerView for me to use the same template of card for this ... (R.id.acad_year); status_icon = (ImageView) itemView.findViewById...

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

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677 views

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java - OpenGL is not supported by the video driver

When I use this code: import com.badlogic.gdx.backends.lwjgl.LwjglApplication; import com.badlogic.gdx.backends.lwjgl ... driver. any 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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511 views

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java - How to convert JTextField to String and String to JTextField?

How to convert JTextField to String and String to JTextField in Java? See Question&Answers more detail:os...

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

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306 views

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java - Is it possible to have hidden data for each item in the list?

JComponents can obtain hidden data using setName() and getName(), right? What about JComboBox items? (I'm referring to ... best way to do 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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526 views

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java - Can't Select Home Directory for JDK because IntelliJ can't see it?

My system is Linux Mint 18.3 Cinnamon 64-bit. I've installed IntelliJ-IDEA and Default-jdk (openjdk-8-jdk) using ... sure 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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447 views

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java - Android Alert Dialog unable to find view

I'm having trouble getting an AlertDialog to pass text back to the activity that calls it. It seems the issue ... string back to the 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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779 views

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java - The absolute uri: http://www.springsource.org/tags/form cannot be resolved in either web.xml or the jar files deployed with this application

Currently, I use a 'Maven' project where I put in my pom.xml the current dependencies to use Spring ... files deployed with this application See Question&Answers more detail:os...

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

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638 views

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java - How to encrypt zip file using zip4j

I want to create password protected ZIP: // Set the compression level parameters.setCompressionLevel(Zip4jConstants. ... file inside 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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432 views

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java - Hashmap and hashtable in multithreaded environment

I am really confused on how these 2 collections behave in multithreaded environment. Hash table is synchronized ... value simultaneously right? See Question&Answers more detail:os...

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

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419 views

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java - Does JPA/Hibernate save even when not calling persist

em.getTransaction().begin(); StringData sd = em.find(StringData.class, key); System.out.println("Old value: " ... on when something is saved? See Question&Answers more detail:os...

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

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743 views

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java - AtomicBoolean vs Synchronized block, whats the difference

I am trying to understand the difference between the two following code blocks AtomicBoolean ab = new AtomicBoolean(false) ... ) they are safe?, See Question&Answers more detail:os...

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

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537 views

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java - Change focus to next component in JTable using TAB

JTable's default behavior is changing focus to next cell and I want to force it to move focus to next ... component instead of next cell? See Question&Answers more detail:os...

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

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