Recent questions tagged Java

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java - How to convert a float into a byte array and vice versa?

I am trying to convert a float into a primitive byte[] and vice versa: public byte[] floatToByteArray(final float value) ... (byte) (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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java - JavaFX 2.1 MessageBox

Good day! I am developing a program using JavaFX SDK. I wanted to have a message box like in C#: ... . Answers are very much 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 - Access static final variable using reflection

I have a Java class with a static variable package com.mytest public class MyClass{ public static final TextClass ... to access the object.) 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 create Flux from Mono

I have a Mono A. The Object A contains two lists. I want to create direct two Flux. Is this possible ... fromIterable(a.block().getList1()); 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 the max precision for double

I am trying to determine what the maximum precision for a double is. In the comments for the accepted answer in ... How do you determine 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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985 views

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java - unicode characters appear as question marks in IntelliJ IDEA console

I'm trying to write unicode characters (?) using System.out, and a question mark gets printed instead. How can ... to print from within the IDE. 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 - Regular expression: who's greedier?

My primary concern is with the Java flavor, but I'd also appreciate information regarding others. Let's say you have ... prints "<Oh><><MyGod>" 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 it possible to parcel a generic class?

I'm trying to create public class MyClass<T extends Parcelable> implements Parcelable. I'm having trouble implementing ... > is nonstatic. André 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 this program using Collections.sort only fail for lists of size 32 or more?

The following program throws the following exception: java.lang.IllegalArgumentException: Comparison method violates its general ... } } } 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 - JFileChooser select directory but show files

I feel like there should be a simple way to do this but I can't figure it out. I have a JFileChooser that ... there an easy way of doing 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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703 views

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java - Why am I getting package javax.crypto does not exist

When I compile a class using javax.crypto.Mac I get this error message? package javax.crypto does not exist ... , but jce seems special? 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 - How to convert SOAPBody to String

I want to convert SOAPBody to String. What is the best way to do it? Should i first convert it to xml and ... can jsut convert it into String. See Question&Answers more detail:os...

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

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149 views

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java - Parsing an XML stream with no root element

I need to parse a continuous stream of well-formed XML elements, to which I am only given an already constructed ... and java.xml.* packages)? See Question&Answers more detail:os...

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

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248 views

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java - Set DatePickerDialog title permanently

I have a problem when I'm trying to set DatePickerDialog title permanently. DatePickerFragment.java public class ... for my English. Patrick 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 - Abstract class as parcelable

Basicly I have the following structure in my app: It would be straightforward to implement such a structure ... have to implement a CREATOR See Question&Answers more detail:os...

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

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138 views

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java - What does UseContainerSupport VM parameter do?

What does this option do in docker file? ENTRYPOINT java -XX:+UseContainerSupport $JAVA_OPTIONS -jar /myapp.jar Will ... still not clear to 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 - Copy InputStream, abort operation if size exceeds limit

I tried to copy an InputStream to a File, and abort the copy if the size of InputStream is greater than 1MB ... reused in a copy file operation. See Question&Answers more detail:os...

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

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865 views

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java - error: an enum switch case label must be the unqualified name of an enumeration constant

error: an enum switch case label must be the unqualified name of an enumeration constant error: duplicate case label no ... builder.show(); } } See Question&Answers more detail:os...

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

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189 views

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java - Fast implement wrapping (delegate methods) in Eclipse?

Is there some template or something to implement iterface methods with accessing to wrapped member? For example, suppose I ... ; } and so on. See Question&Answers more detail:os...

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

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320 views

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java - Maintain file permissions when extracting from a zip file using JDK 5 api

I am using java.util.Zip and java.util.ZipEntry to successfully extra a zip file's contents to disk. I would like ... "correct" 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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739 views

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java - Jackson date-format for OffsetDateTime in Spring Boot

I'm trying to output an OffsetDateTime from my Spring application, and have in my application.properties these ... in my Spring 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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196 views

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java - @Autowire strange problem

I have a strange behaviour when autowiring I have a similar code like this one, and it works @Controller public class ... it be a Spring bug? See Question&Answers more detail:os...

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

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226 views

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java - @override annotation

Do I need to put @Override annotation when I implement an interface (not override an abstract class)? ... does @Override annotation achieve? See Question&Answers more detail:os...

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

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110 views

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java - Comparing Class objects

I have to compare a Class object against a list of pre-defined classes. Is it safe to use == or should I ... it like an enum in this situation! See Question&Answers more detail:os...

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

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142 views

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java - Equality in Kotlin

I'm learning Kotlin, with a C++ and Java background. I was expecting the following to print true, not false. I ... ("Charlie", "Parker")) } See Question&Answers more detail:os...

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

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193 views

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java - How to make JOptionPane.showConfirmDialog have No selected by default?

I implemented a Save As dialog in Java that prompts the user if the file already exists, and I want the No ... } super.approveSelection(); } }; See Question&Answers more detail:os...

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

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145 views

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java - Is there a way to make sure classes implementing an Interface implement static methods?

First of all, I read erickson's useful reply to "Why can't I define a static method in a Java interface?". This ... new double[]{1,2,0});. 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 - Quickest way to clone a GregorianCalendar?

I'm trying to make a deep copy of an object, including a GregorianCalendar instance. I'm always wary of ... missing some simple shortcut 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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