包含标签：Java 的文章
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Java – play frame JPA problems with save()
I'm trying to save a simple object in the database, but it gives me some problems This is my object class: @Entity @Ta…… -
Java – does the implementation of hasmap store key value pairs in the linked list
I read in a book that when we place an element in a HashMap, it is stored internally in a bucket My question is >Do…… -
How to set expiration date in Java
I'm trying to write some code to correctly set the expiration date of a given date For example, this is what I have Da…… -
In Java, when the ThreadLocal object is modified, will the change be retained in the next request?
In a typical web application, when a request enters, the filter looks for the context object in the HTTP session If it…… -
Java – installing J2ME applications in Samsung Mobile
We develop J2ME applications for low-end mobile devices that support Java, such as Nokia S40 phones In our application…… -
Java general problems
The following code compiles, but if I uncomment the comment line, it won't. I'm confused why HashMap does extend abstr…… -
Java – subclass inheritance using different packages?
Thanks for the great answer about inheritance Another question: Subclasses can always inherit protected members of the…… -
Java – get the IP address of the Android device when connecting to the 3G mobile network
When I connect to WiFi, I can get the IP address of Android phone However, when you connect to a mobile network such a…… -
Java – what is the best way to verify multiple instanceof with basic types (for example, switch case)?
I searched the answer here, and every post I found is actually the "fragment" I am looking for I want to find a better…… -
Java – spring hibernate JDBC batch size
I have several scenes. I think it's a little unclear from hibernate documentation Data class: class HibernateDao { …… -
Java – I received this warning: com sun. org. apache. xml. internal. serialize. Outputformat is a proprietary sun API and may be removed in future releases
My code is OutputFormat wOf = new OutputFormat( "XML","ISO-8859-1",true ); Help me solve this warning Thank you in adv…… -
How to adjust the scroll bar using the images zoomin and zoomout in swing
I want to adjust the scroll bar when the images zoom in and zoom out. My image display on JPanel and JScrollPane conta…… -
Java – get content from HTTP request even without content length header
I'm testing a client that sends me an HTTP request with content but no content length title How do I extract this cont…… -
Logical comparison between Java synchronized keyword and spring @ transactional annotation
In one of the demonstrations on spring / Hibernate transactions, I made an opinion that @ transactional has many logic…… -
Java – project Euler #11
I recently started using java to test my skills I have problem 11, so that all previous problems are correct There is …… -
Java – IllegalStateException: unable to overwrite guava map Reasons in put
I use to create a map new MapMaker().softValues().maximumSize(cacheSize).makeMap(); This seems to work, but after depl…… -
Operating system event handlers using java
I have a java process as a daemon that monitors directroy on the file system. Once a newy file is added to the java pr…… -
The fastest way to find strings in text files using java
What is the fastest way to check whether a file contains a string or number? Solution Take a look at the scanner class…… -
Generating random unique sequences in Java
I have a series of numbers, for example, that's it [1,3,5,7,9] It is possible to generate 5! This is a unique sequence…… -
Java – add custom attributes to JTree nodes
I need to store some data in the JTree node Can I add custom attributes to the node to save my data? Solution You can …… -
Java – cannot map control backspace to keystroke
I can't map the control backspace key to keystroke The following is meaningless to me import java.awt.event.KeyEvent; …… -
Java – save JPanel graphics
I'm not sure how graphics work in Java, so I can't debug my problem This is a quick code that will demonstrate my prob…… -
Java – when the direction changes, the activity will continue to restart
How can I prevent the activity from restarting when the screen rotates or the user slides the keyboard on the phone? I…… -
Java regular expression – matches all strings except a few
I have these strings in the array. I want to iterate over the array and find matching data (check one row for each mat…… -
Java – finds the longest prefix of string s, which is the substring inverted by string s
Is there any way to use the linear time algorithm to find the longest prefix of string s, which is the substring of th…… -
Java – runs background jobs without affecting the rest of the GUI
I'm looking for help with general methods I have written some java code to view unread messages in my mailbox on butto…… -
Java EE – Java se or Java EE (standard or enterprise)?
I started doing a lot of Java EE development work Can I install Java EE on my home machine instead of JRE? In addition…… -
Unit testing – use findall to generate simulated Grails methods for missingmethodexception
def retrieveEatenFood(String token,String addedDate) { def retrieveEatenFood(String token,String addedDate) { …… -
Is there any way to create a variable number of arrays using loops in Java?
I wonder if there is a way to create arrays in Java based on variable numbers Therefore, if I need to create 10 arrays…… -
Java server client thread problem
Hello I created a thread because I created a client socket when connecting, and it runs through the whole session The …… -
java – String. format：2 => 02
String formatted = String.format("%d:%d",2,5); String formatted = String.format("%d:%d",2,5); I will output 2:5 But I …… -
Java – draw polynomials
I just want to know how to draw polynomials like x ^ 2 * x ^ 4 Solution If your environment has good Unicode Fonts, yo……