Recent questions tagged java

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java - RecyclerView: Inner classes cannot have static declaration

I am a little confused. I've set up a RecyclerView as per the tutorial on google/android site and I ... studio is complaining Any ideas? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Is it possible to create an URL pointing to an in-memory object?

I'm trying to extend my library for integrating Swing and JPA by making JPA config as automatic (and ... URL> findResources(String name). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - When to request permission at runtime for Android Marshmallow 6.0?

I am testing my app on Marshmallow 6.0 and it's getting force closed for the android.permission. ... the permission is required? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What does int.class mean

In java int, float and etc., are primitive types. Wrapper classes are used in case we need to use it with ... though it is a primitive type? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Finding all of the matching substrings, not only the "most extended" one

The code String s = "y z a a a b c c z"; Pattern p = Pattern.compile("(a )+(b )+(c *)c") ... only the most extended one, but also its children? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to pass ArrayList using putStringArrayListExtra()

Hi I want to pass an Arraylist from one activity to another. I use putStringArrayListExtra(), but ... startActivityForResult(list_intent, 2); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - locating file in a classpath

I'm trying to read in file content, ex : public void myMethod(){ FileInputStream fstream = new FileInputStream( ... .. end while end method See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - SpringBoot with Thymeleaf - css not found

First to say is that I've been searching for a solution for a while now and I'm quite desperate now. I cannot ... I know, that I'm not ignored. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Eclipse character encoding

I am using Scanner to scan a .txt document in Java. However, when I open the .txt document in Eclipse, ... the document is quite large. Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to Add/Update/Remove array elements in firebase firestore android using Hashmap? A Store Database

I want to make a collection of users, users will have multiple stores as documents, each document have ... ? FireBase Firestore DataBase Image See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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251 views

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java - Items not showing in the ActionBar with showAsAction=“always”

I'm new to Android programming and currently trying to get the Actionbar working. My problem is, that although I ... } Thanks for your help! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Java8 Transform list of object to list of one attribute of object

I want to use Java 8 tricks to do the following in one line. Given this object definition: @Getter @Setter ... one-liner for this transform? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Random string from string array list

I have list of countries in my array, I would like to pick random country from the list (using random probably?), ... Random r = new Random(); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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715 views

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java - Cannot retry request with a non-repeatable request entity

I'm using java-http-client library and Apache Transport with it on client side and Rails on server side. From ... should I do to avoid this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to read UTF8 encoded file using RandomAccessFile?

I have text file that was encoded with UTF8 (for language specific characters). I need to use ... occurred: java.io.EOFException See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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283 views

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java - Garbage collection - orphaned LinkedList links

Suppose you have references A -> B -> C -> D. When you delete the reference to B from A, you're left ... there any reason/benefit for doing so? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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481 views

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java - ProcessBuilder and Process.waitFor(), how long does it wait?

I am executing an .exe-file from java, using the ProcessBuilder class and the Process class. To explain what I am ... I am glad for any ideas. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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112 views

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java - Why do I get a NullPointerException when comparing a String with null?

My code is breaking on the following line with a nullpointerexception: if (stringVariable.equals(null)){ Previous ... it breaks! Any thoughts? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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245 views

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java - How do I print the variable name holding an object?

How do I print the variable name holding my object? For example, I have: myclass ob=new myclass() How would I print "ob"? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Read text file into an array

I want read a text file into an array. How can I do that? data = new String[lines.size] I don't want to ... println(data[i]); } abc.close(); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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203 views

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java - log4j and the thread context classloader

I'm a newbie to Java and just starting to figure out the concept of class loaders. Right now I am having some ... of using the thread's one? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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484 views

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java - Detecting mouse enter/exit events anywhere on JPanel

Basically there is a JPanel on which I want to know when the mouse enters the area of the JPanel and exits ... all components on the JPanel? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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148 views

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java - Is it possible to use jQuery inside of Vaadin framework?

As Vaadin is a Java web application framework, so is it possible to insert the jQuery javascript snippet in the Vaadin Java code? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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201 views

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java - How to add Class-Path to the manifest file with maven

When using the maven-jar-plugin I would like to add entry to the Manifest.mf So it will contain: Class- ... archive> </configuration> </plugin> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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193 views

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java - Do Robot methods need to be run on the event queue?

Robot is part of the AWT library, but it seems quite different from most all the rest of the library. I am ... event dispatch thread (the EDT)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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148 views

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java - Array of unique elements?

Given an array like the one below, I was wondering if there is an easy way to turn this array into an array with unique ... order: {5,1,2,3,4} See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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336 views

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java - Inject request scoped bean into another bean

I want to create a UUID that is unique in a request life cycle. To do this, I create a UUID bean ... ){ return new RequestContextListener(); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Spring-boot: required a bean named 'entityManagerFactory' that could not be found

I am developing a Spring Boot application using JPA and encountering this error. I am not certain if I am ... > authorities = new ArrayList<>(); authorities.add(new...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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