包含标签：Java 的文章
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IO stream technology
Create and delete files: createnewfile(), delete() Create folders: mkdir() and mkdirs() List next level: lists the sub…… -
How to resolve file names in Java?
I have a java file path /opt/test/myfolder/myinsidefolder/myfile. jar I want to replace the file path with the root pa…… -
Java – how to add padding using container?
I tried to do some padding at the top, but how do I use the container? JFrame frame = super.screen.getFullScreenWindow…… -
How to use Qt5 to realize multithreading (I)
#include "thread_one.h" thread_one::thread_one(QObject *parent) : QThread(parent) { } void thread_one::run() { …… -
The value of Java jsonobject array is key
I'm new to Java, so it's a little confusing I want to get a string in JSON format What I want is { "user": [ "name","l…… -
Java hashcode() string conflict
I know little about hash codes I found that this code can print out collisions Can you tell me what collision is and h…… -
Java – allocate memory using thread
I wonder what happens if a local thread is declared in a method? Usually, after the function returns, all local variab…… -
How to solve this Java lang.ClassCastException：org. apache. tomcat. dbcp. dbcp. Basicdatasource cannot be cast to org apache. tomcat. jdbc. pool. DataSource？
I tried to use pool for database connection in Tomcat. This is my context: <Resource name="jdbc/slingemp" auth="Con…… -
Java – read from InputStream and write to OutputStream
This should be very simple. I searched Google, but I didn't see anyone mention the problems I noticed Everything I've …… -
How to set httppost header for client requests in Java and Android
I can't get Apache httpclient to send httppost header correctly I have no problem sending name value pairs and things …… -
Java – how to display ProgressDialog when using salvo for network operations
I work on an Android application and I am very interested in using the volley library to perform network HTTP calls Bu…… -
Java – abstract classes cannot be implemented from other packages
For some reason, I can't seem to implement an abstract class outside the package that defines it Abstract classes in P…… -
Java – find the smallest integer based on the input
I have a task to find the minimum, maximum and average number of user input Basically, they enter positive integers, s…… -
How to ensure that collections in Java contain only one type?
I want to make sure that the collection can only hold one type It can be said that there is such a method public Colle…… -
The most lightweight Java collection
If I want to create a Java collection and just want to fill it with elements and traverse it (I don't know the necessa…… -
Java – design GUI for J2ME applications
How to create J2ME application for mobile phone using GUI similar to menu displayed in java game? I've tried using Net…… -
Javac does not have openjdk-6-jdk installed
I've been trying out some different Java compilers over the weekend and decided to stick to javac this morning Then I …… -
Java – wait for all threads to complete before closing executors
This is a snippet of my code ExecutorService executor = Executors.newFixedThreadPool(ThreadPoolSize); while(conditionT…… -
Java – Maven compilation does not create class files
I have a 3-module Maven project with the parent POM When I run Maven clean compile test from the parent process It fai…… -
Java – how to add a second table to the database in SQLite?
I have a database exam guide. I have created a table_ Subject and now private static final String DATABASE_CREATE = "c…… -
For loops run forever in Java [copy]
See English answer > what is X after "x = x + +"? 17 @H_ 419_ 9@ @H_ 419_ 9@ public static void main(String[] args…… -
Implicit super interface in Java?
So we all know that all classes implicitly extend object How about the interface? Is there an implicit super interface…… -
Java – why can I unexpectedly create multiple instances of my singleton class?
According to my knowledge, singleton design pattern means that we can only create a single object of one class The fol…… -
Java – aliastobeanresulttransformer and hibernate sqlQuery
I have a fairly complex query (HQL or criteria queries have too many nesting levels), so I write it as sqlQuery I real…… -
Understanding generic types in Java
I have a general class that says: @H_ 404_ 8@ @H_ 404_ 8@ MyClass<T>@H_419_12@ 在这个类的方法中,我想测试T的类…… -
Java – how to get parameters from the URL in Liferay portlet?
I used something like feed in Liferay 6 JSP of out of the box portlet such as jspf: String articleId =null; HttpServle…… -
Java – ArrayList removeall() does not delete objects
I have simple ArrayLists for member classes: ArrayList<Member> mGroupMembers = new ArrayList<>(); ArrayLis…… -
Concurrency – can I receive results from one of multiple goroutines in go?
I just learned about Google's programming language go I'm interested in the concurrency support it provides and set ou…… -
Java – splits the list into sub lists according to the conditions of the stream API
I have a specific question There are some similar problems, but these problems are either Python or Java, or even if t…… -
Can you comment on my java game?
I have marked this question as a community wiki, so no reply points will be thrown I made this game, forest defender, …… -
Java – cannot inherit from final class
I just created my first Android library In another application, I want to extend a class from it But it shows an error…… -
Is there any way to declare a method “friendly” in Java?
I know you can set the property to public, friendly or private to specify its visibility Is there any way to announce ……