Java
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Do not rely too much on the expired monitoring of redis!!
Redis expired monitoring scenario In business, there is a need to wait for a certain time to execute a certain behavio…… -
This is an article from Alibaba’s internal technology forum
This is an article from Alibaba's internal technology forum. The original text has been unanimously praised by Alibaba…… -
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Java access rights
public Classes in the same package or in different packages can be accessed freely private Can only be used in this cl…… -
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Application of Java this
package java04; public class DemoPersom2 { public static void main(String[] args) { Person2 person = …… -
Java replacement regular expressions do not work properly
Why doesn't this line of code work? It should replace all punctuation with nothing m = m.replace("[\\?\\.;:'\"]","") A…… -
The easiest to understand example of volatile keyword in Java
I am reading the volatile keyword in Java and fully understand its theoretical part But what I'm looking for is a good…… -
Implementation of Java JDBC interface
In JDBC, in order to connect and execute statements in dB, we mainly use connection, statement and resultset as interf…… -
What are JAVA memory management best practices?
I'm taking over some applications from former developers When I run the application through eclipse, I see a lot of in…… -
Java – attach a single action listener to all buttons
I have a program with many buttons, all of which will perform the same function I wonder if there is a way to attach a…… -
Java – play multiple sound clips using clip objects
I'm developing a program that contains a large number of JButton objects. I hope each object has its own Wav file In a…… -
Reverse single linked list Java
How to reverse a singly linked list in blocks of some given size in O (n) time in place? 4 public void reverseList(){ …… -
JAVA_ What is the reason for the existence of the home environment variable?
Many Java based applications need to set up Java_ Home env variable What is the purpose of this variable? Solution An …… -
Java – abnormal behavior of the zoom in and zoom out function of JfreeChart?
I observed that the functions of "zoom in" and "zoom out" were completely different from those expected For example, w…… -
Java – is there a way to run methods / classes only when Tomcat / wildfly / GlassFish starts?
I need to delete the temporary files during Tomcat startup and transfer them to the folder containing the temporary fi…… -
Java – populate JfreeChart timeseriescollection from MySQL DB?
I'm trying to create a chart in my application that will return the temperature in a few months This chart is a JfreeC…… -
Return date type in Java format
See the English answer > change the format of date Java [closed] Example: original date: 2018 / 01 / 01t15:00.00 00…… -
Java – unable to get okhttp’s response body. Tostring() to return a string
I'm trying to get some JSON data using okhttp, and I can't figure out why when I try to record response body(). The re…… -
Java – how to read PDF stream in angularjs
I get the following PDF stream from the server: How do I read this stream in angularjs? I try to open it as a PDF file…… -
Java – can I sort two lists into each other?
I prototype in Python and I use the zip function. I don't know how to do this in Java Basically, I have two lists (one…… -
Java – compile to a specific JRE using eclipse
I have two questions about compiling projects into specific jres in Eclipse: 1) Project Properties Window > java bu…… -
Java – Hibernate: myinterceptor #onflushdirty will never be called
Question: why never call myinterceptor #onflushdirty? I extend abstractentitymanagerfactorybean in XML configuration &…… -
Copy text to clipboard using java
I want to copy text from JTable cells to the clipboard so that it can be pasted into other programs, such as Microsoft…… -
JApplet creates a ball that bounces and gradually drops in Java
public class Circle extends JApplet { public class Circle extends JApplet { public void paint(Graphics g) { …… -
Java – double click: enlarge Android MapView?
After some work, my route application works normally Can you give me a hint? Solution Implement gesturelistener to rec…… -
What is the purpose of using java layout manager?
It seems that whenever I try to create a program, I always use setlayout (null); Commands in Java because I like to ab……