Recent Posts
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Java – put expensive resource creation in static blocks?
I am using JAXB version 2.0 To do this, I create a jaxbcontext object as follows: package com; import javax.xml.bind.…… -
Java – finds the second smallest integer in the array
In our assignment, we need to recursively find the second smallest integer in an array However, in order to better und…… -
Java – method. Java is called when a parameter in an array invoke()
I have the following interfaces: interface Foo { void bar(String a,int b); } I want to call foo reflexively Bar (on …… -
How to unpack streamex as a “normal old Java stream”?
Streamex is a powerful library, but sometimes I no longer need its superpower How can I get rid of streamex internal e…… -
Java – sort arrays by time
First, I use an array to get such information: // Tuesday array[2][1] = "tuesday"; array[2][2] = "20:00"; // Wednesda…… -
Java run static method in new thread
I just started learning Java, and I encountered a slight obstacle involving threads I have a static method. I want to …… -
Shift right in Java
I just stick to this little logic. I didn't do it right Int is 32 bits, so assume that binary 20 is like // 0000000000…… -
Java – uses an object as a variable in the constructor
I have a question about using objects as variables in constructors It may be simple, but I really can't think of what …… -
Java – if I call a static method, does the constructor run
I have a class named tile with a static method public static buffered image grass(). The class also has a constructor …… -
Symfony – marks a single doctor migration as run / executed
Is there a way to mark a doctor migration as "running" or "executed" because it does not appear as a migration that ne…… -
How does this multithreaded java code work?
In view of this, the Java code: class Account { private Integer number = 0; public synchronized void s…… -
How to do without system Exit Java program without exit? (from user input?)
This is my code I don't know how to exit the program with the return value Any ideas? This is the last step of my task…… -
Java – how do I rename a file to another file system?
I encountered a strange problem when using renameto() I don't know why I can't rename it / MNT / desttest, but I can r…… -
Destroy objects in Java
If I set a null object, will Java destroy the original object? For example: Foo f = new Foo(); // ... Foo b = f; If I …… -
Java – how do I change the value of jtextfield?
I'm trying to build a Java application using JFrame and swing. I have five jtextfield instances One of them is sum I n…… -
Java – when executing HTML Change the HTML link style in textviews after fromhtml
I'm developing an Android application I retrieve some data that looks like this: <a href="http://google.com/" title…… -
Read the value from the format string Java, groovy
I want to know how to read a single attribute from a formatted string in groovy or even Java I have a string containin…… -
Java – use the base64 class in JDK7
I tried to use the base64 class in JDK7, but the base64 I got could not resolve the error Why does eclipse throw this …… -
Where is the Union () method of the Java – spark dataframe class?
I am using Spark's Java connector and want to combine two dataframes, but the strange thing is that the dataframe clas…… -
Java – interfaces and abstract classes
I'm a little familiar with the difference between abstract and interface classes, but Solution The fields in the inter…… -
Java, convert date to string and return the date that generated the error
I tried to convert date to string and then back to date But I find that the last date is different from the original d…… -
java. Lang. outofmemoryerror: Java heap space error when executing millions of queries
In my application, I need to perform millions of queries on MySQL database The code is as follows: for (int i=0; i<…… -
Java – stack multiple bufferedimages together?
I have multiple transparent buffered image instances. I want to stack them together (that is, Photoshop layers) and ba…… -
Java – which method in jsoup can return modified HTML?
When I use jsoup to parse HTML files (stored locally) I modified some elements in the HTML file, so I want to save the…… -
Java – how to check that we use Oracle 8i database in JDBC?
In JDBC, how to check that we are using Oracle 8i database? Solution Connection connection = DriverManager.getConnecti…… -
Java – returns a static HTML without redirection in spring
So I want to return to the HTML page without sending a redirect The reason is that the URL in the browser is changed b…… -
Java – redraws JPanel only after window resizing is complete
I have a JPanel and I draw four rectangles on it Randomly select the color of each of these rectangles The color chang…… -
What is the main framework / library of Java AOP?
I know AspectJ, spring and JBoss Are there any other mature and widely adopted frameworks? Solution Google's popular d…… -
Java – http / 1.1 400 error request on httpget with basic authentication
I made an application for httpget My application uses its own certificate, so the server requires user login For certi…… -
Java eclipse Maven version control
Which of the following files should be versioned? Why? >Class files compiled from source code. > Other files gen…… -
Throw exceptions only in debug mode in Java
Even if there are problems, I want to avoid collapse That's why I don't want to throw exceptions that I know won't be …… -
GUI Java program requiring action event button
I am making a simple java program representing the Microsoft Word menu bar. I add an exit button in the file menu... I……