Recent questions tagged JAVA

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java - Use string in place of variable name

If you have a Java variable named xyz. Then later on I define a string which has the value of the ... setPreferredSize(new Dimension(40,30)); 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 - JUnit and junit.framework.TestSuite - No runnable methods

I've made some unit tests (in test class). The tutorial I've read said that I should make a TestSuite for ... ideas why this isn't working ? See Question&Answers more detail:os...

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

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627 views

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java - JFrame isResizable(false) sizing issue

I intended to make a JFrame with a ContentPanel of 600x600 and I wanted the JFrame to be not re-sizable. ... visible part of the panel/pane. 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 call a Delphi function that returns a string using JNA?

I'm working on calling functions from a Delphi compiled *.so file from a Java program. After some research it seems like ... version 2.4.4-3.1. 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 - Upload a file to AWS S3 pre-signed URL using Retrofit2

I'm trying to upload a file to Amazon's S3 using a pre-signed URL. I get the URL from a server which ... with a pre-signed URL using Retrofit2? See Question&Answers more detail:os...

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

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665 views

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java - Gson doesn't serialize fields defined in subclasses

For some unknown reason if I have: class A{ int stars; public int getStars(){ return stars; } public void setStarts( ... a B). How to do that? 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 - Sorting (names) using Merge Sort

having problem sorting repeated Strings, and here's my code.. i successfully sorted the first array but in the ... Soliel Darryl Zoom-zoom ... See Question&Answers more detail:os...

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

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702 views

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java - Calculating the Sum of values in a linked list

I got a programming question at an interview recently. There are 2 linked lists. Each node stores a value from 1 ... } return answer.next; } } See Question&Answers more detail:os...

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

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892 views

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java - Eclipse with $LD_LIBRARY_PATH

I have some library files built using JNI in the directory /usr/local/lib/. If i start the Eclipse from luncher, the ... 3.6.2, on Ubuntu OS. 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 run jar file form C# code

I am new to C# and tying to run jar file from C# code. But it seems that jar file is not opening and command ... ? Whats wrong I am doing here ? See Question&Answers more detail:os...

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

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821 views

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java - How to convert String into Byte and Back

For converting a string, I am converting it into a byte as follows: byte[] nameByteArray = cityName.getBytes(); ... would I convert it back? See Question&Answers more detail:os...

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

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815 views

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java - Generated column and table names in hibernate with underscore

how do I force hibernate to generate db schema such that it converts CamelCase into Underscores (using HBM)? Eg. ... time and prevent errors). See Question&Answers more detail:os...

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

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628 views

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java - OOP Access Modifiers: Compile-time or Run-time

I've heard that Access Modifiers Public, Private and Protected are just some Compiler Stuff, and they're not ... they handle Access Modifiers. See Question&Answers more detail:os...

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

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972 views

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java - How to resolve duplicate class error in gradle build?

I have tried to use ibm tone analyzer api for my project, but if I include the dependency I get this ... ) { delete rootProject.buildDir } See Question&Answers more detail:os...

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

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886 views

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java - Is System.out buffered or unbuffered?

Is System.out buffered or unbuffered? I read this is an object of InputStream and PrinterStream is the type ... they are written immediately. See Question&Answers more detail:os...

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

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896 views

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java - InetAddress.getHostAddress() ipv6 compliant?

Is InetAddress.getHostAddress() ipv6 compliant in JDK 1.6? Specifically I am doing InetAddress.getLocalHost(). ... ipv4 and v6 addresses? 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 checkbox value(s) from a Servlet

I have a servlet with MySQL database in it. It looks like this: here is the piece of code for it: out. ... Can anyone please help me with that? See Question&Answers more detail:os...

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

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689 views

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java - Using reflection to get a method; method parameters of interface types aren't found

How do I get a method using reflection based on a parameter value when the parameter type is an interface? ... List controller.addList(list); } See Question&Answers more detail:os...

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

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745 views

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java - Can Items in a JList be formatted as HTML

I would like to create a JList in Java so that each individual item is formattted using HTML tags, but I'm ... have any suggestions? Thank you. See Question&Answers more detail:os...

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

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623 views

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java - Image isn't creating using the BitmapFactory.decodeByteArray

Edit: When I save those bytes in the txt file and when I save it as png file , it shows the image ... images with windows default image viewer. See Question&Answers more detail:os...

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

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723 views

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java - CommPortIdentifier.getPortIdentifiers is empty

I am building a simple application that communicates through Serial Port using the Java Communication API javax.comm. ... could be? Thank You See Question&Answers more detail:os...

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

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799 views

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java - More Intelligent Eclipse "Open Call Hierarchy"?

If I have a Java project in Eclipse, I can right-click on a method name and "Open Call Hierarchy." Suppose I ... not showing those from B's? See Question&Answers more detail:os...

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

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1.3k views

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java - Unable to run tests with JUnit5 Console Launcher

I am trying to run a simple test with the JUnit5 console launcher. I tried several options, but it does not work. Can ... (2, 3 - 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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768 views

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java - Redefine Named Excel Range then Save using Apache POI

Using Apache POI, I'm able to find a named range: XSSFName[] ranges = new XSSFName[workbook.getNumberOfNames( ... the range is completely 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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737 views

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java - Why is some output in Eclipse console - red?

I have console output of different color in Eclipse: red and black. What does the color mean in this context? See Question&Answers more detail:os...

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

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889 views

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java - How to add a JComboBox to a JTable cell?

I am trying to add JComponents to JTable Cells. Do I Implement CellRenderer or CellEditor? See Question&Answers more detail:os...

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

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676 views

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java - substitution cipher with different alphabet length

I would like to implement a simple substitution cipher to mask private ids in URLs. I know how my IDs will ... is of course also helpful. See Question&Answers more detail:os...

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

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1.1k views

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java - Generic Generics: "Syntax error on token "extends", , expected"

public interface View{... public interface Control<V extends View>{... public class RemoteControl<C extends Control<V ... in a more elegant way See Question&Answers more detail:os...

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

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