Recent questions tagged Java

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java - How to sort String array by length using Arrays.sort()

I am trying to sort an array of strings according to their length using Arrays.sort(), but this sorts the strings ... JDK 1.7 & JDK1.8. 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 wildcard address in InetSocketAddress mean?

In the docs for the constructor InetSocketAddress(int port) it says: Creates a socket address where the IP address is ... used in socket.bind()? 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 - compile error: cannot find symbol: In, StdIn and StdOut

The code is from http://algs4.cs.princeton.edu/11model/BinarySearch.java.html for Algorithms textbook. import java.util. ... (key); ^ 4 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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java - apache commons configuration loads property until "," character

I want to load configuration (apache commons configuration) from a properties file. My program is: ... character. Any ideas? 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 - Android - Send Telegram message to a specific number

I'm trying to send a Telegram message to a specific number from within my Android app. Right now my code launches ... .LENGTH_SHORT).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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java - "Warning: Do not place Android context classes in static fields; this is a memory leak (and also breaks Instant Run)"

Similar question have been asked here, here and here but the context is quite different from this and moreover the ... knows 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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java - How to persist a lot of entities (JPA)

I need to process a CSV file and for each record (line) persist an entity. Right now, I do it this way: ... shouldn't have to worry about 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 - How to remove bad characters that are not suitable for utf8 encoding in MySQL?

I have dirty data. Sometimes it contains characters like this. I use this data to make queries like WHERE a.address ... ? I use Java. 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 - Spring Reactor: Mono.zip fails on empty Mono

I am using Spring Reactor 3.1.0.M3 and have a use case where I need to merge Mono's from multiple sources ... object instead of having to cast? 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 return actual html file using JAX-RS

so far, I'm returning html my home page by: @GET @Produces({MediaType.TEXT_HTML}) public String viewHome() { return ... do I do this? 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 - Using Spring Security, how can I use HTTP methods (e.g. GET, PUT, POST) to distingush security for particular URL patterns?

The Spring Security reference states: You can use multiple elements to define different access requirements for different ... the URL pattern? 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 - Reading JSON Content

I'm using jsoup to scrape some HTML data and it's working out great. Now I need to pull some JSON ... not parsing properly with Gson. 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 - Spring MVC, forward

Is there any difference between public class Controller1 extends AbstractController { @Override protected ModelAndView ... } } 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 - Are all final variables captured by anonymous classes?

I thought I knew the answer to this, but I can't find any confirmation after an hour or so of searching. In ... t able to find the answer there. 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 - Do I need to close files I perform File.getName() on?

I'll be having lot of files in a directory. I'll be just getting the file names using File.getName() and ... operation in it. Is this correct? See Question&Answers more detail:os...

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

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199 views

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java - GET HTTP request payload

I am designing an API and I wonder if it is fine to send a JSON payload on a GET request? In this ... you? Based on the above considerations. 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 - how to add all required dependencies for hibernate?

I have downloaded the zip from the Hibernate website and we have a folder which contains all required jars. ... all required libraries 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 - final variable case in switch statement

final int a = 1; final int b; b = 2; final int x = 0; switch (x) { case a:break; // ok case b: ... have done final int b = 2, everything works. 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 - Get date representation in seconds?

I am using an API which requires a date parameter as a number of seconds, an int. My problem is that I ... int parameter which the API requires? 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 content-encoding being set to UTF-8 invalid?

Hi I have a client that is trying to POST to us with the following http headers: content-type: application/x ... some light into this matter? See Question&Answers more detail:os...

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

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324 views

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java - How to transpose List<List>?

I have a following ArrayList, [Title,Data1,Data2,Data3] [A,2,3,4] [B,3,5,7] And I would like to ... Any hint would be much appreciated. 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 - JAXB XMLAdapter method does not throws Exception

I am using JAXB XMLadapter to marshal and unmarshal Boolean values. The application's XML file will be accessed ... to resolve this problem? 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 - Convert a string to GregorianCalendar

I have a string from an email header, like Date: Mon, 27 Oct 2008 08:33:29 -0700. What I need is ... () to return -7 * milisInAnHour. 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 - convert vector to jobject in C++/JNI?

I am using Java native function - public native ArrayList<String> parseXML(); In C++ my native function - ... vector type) to jobject type? 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 there any way to add a MouseListener to a Graphic object?

Is there any way to add a MouseListener to a Graphic object. I have this simple GUI that draw an oval. What ... on the oval. 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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262 views

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java - How do i find out the JDK version Eclipse is using?

I see JRE all over the place, but i can not be sure which JDK is compiling my code. How do i find out? 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 - ActionBarSherlock library is full of errors after being imported

Okay, I'm trying to get ActionBarSherlock working, so I imported the library by: Creating New Project > Create ... /menu line 123 Java Problem 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 Security @AuthenticationPrincipal

I've been trying to get @AuthenticationPrincipal to work properly with a custom User class. Unfortunately, the ... 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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