Recent Posts
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Java – mongodb upsert exception invalid bson field
This exception: Exception in thread "Thread-1" java.lang.IllegalArgumentException: Invalid BSON field name id at o…… -
Is java heap memory continuous?
I've seen people comment that Java heap memory is continuous, and people say the opposite So, can someone give me a fi…… -
Java – spring AOP: @ annotation (annotation)
I (of course) try to maintain the project with many structures I don't know very well In trying to figure out the use …… -
Java – gradle always executes println from any task
I have a simple build Gradle (or build. Gradle for any task with println) println GradLeversion.current().prettyPrint(…… -
Java – httpclient publishing progress and multipartentitybuilder
I tried using httpclient 4.3 3 and multipartytybuilder achieve progress when uploading files So I actually execute a p…… -
Java – multiplication overflow of two ints results in negative numbers
Consider this fragment in the Java language specification class Test { public static void main(String[] args) { …… -
Are the following incremental code threads safe in Java?
Java code: public class IncreaseTest { public static int value = 0; public synchronized int increment() { …… -
Java – how to group / classify a large number of JUnit tests
In our project, we currently have a large number of JUnit tests, which are divided into three categories: unit, integr…… -
Java converts GIF images to PNG format
I have to build a java servlet to receive images and return images converted to PNG format How can I do this? Thank yo…… -
Java – how to write init scripts
Hi, I'm using 64 bit Fedora 10 Linux I have created a sample Java application Now I want to write an init script for t…… -
Java – Android – weird escapeutil.unescapestring crashes
We encountered a crash when receiving JSON strings from our application server. We think that additional escape will b…… -
Android BuildConfig.VERSION_ Name returned null?
I want to display my version name on the login screen, but it always returns null. I defined my versionname in the gra…… -
Android – non export activity: start on the simulator; SecurityException on mobile phone
There is a non export activity in my project If I try to start it on my phone using ADB: adb shell am start -n "packag…… -
Java: scheduling tasks at random intervals
I'm new to Java. I'm trying to generate a task that runs every 5 to 10 seconds, so any time interval between 5 and 10,…… -
Why does Java’s schedulewithfixeddelay use runnable instead of futuretask Packaging runnable?
Why does Java's schedulewithfixeddelay use runnable instead of futuretask to wrap runnable? It can be easily displayed…… -
Java – get button name from actionlistener?
I have browsed the Internet, but I can't find the answer I am using the for loop to create 36 buttons called A1, A2, e…… -
Java gets the file extension without substring
How to get a file extension in Java without using stupid lastIndexOf ('.') and so on? Solution The Apache commons libr…… -
Java – mockito throws an outofmemoryerror in a simple test
I try to use mockito to simulate the database pool (only for retrieving data), but it will run out of memory when runn…… -
Generate Java dump when OUTOFMEMORY
I have a program that should eventually generate OUTOFMEMORY public class VeryLargeObject implements Serializable { …… -
Java – null is a good way to check a long list of parameters
Suppose that all parameters of the same type for some methods are long I have similar operations on each parameter (if…… -
Java – improved main screen algorithm
I'm trying to make a good java program to generate prime numbers from 1 to n (mainly for project Euler problems) At pr…… -
Layout – how do I get the buttons to populate the JavaFX gridpane?
Java swing has a GridLayout that allows you to specify the size of an array of widgets, such as 3x4 The widgets then p…… -
Java – how to split without regular expressions
In my java application, I need to use the same "target" to find the index and split the string in both cases The goal …… -
Close the Java program correctly when jdialog is the main window
I have a jdialog as the main window in my application (initially it was a JFrame, but it showed in the taskbar that I …… -
Java – invariance and readability
So I have been reading effective java written by Joshua Bloch and noticed two points I encountered in my work Point 1:…… -
Java – should I always use generics?
I created a unit test: new Callable() { @Override public Object call() throws ..... I received a warning in E…… -
Java – how to generate an IP address range given the start and end IP addresses?
How do I generate a series of IP addresses from the start and end IP addresses? Network example "192.168.0.0/24": Stri…… -
Java – set the most important bit by bit
I want to find the most important bit set to 1 I've tried all possible ways from & oring all bits from 1 to 31, it…… -
java. Lang. class and equal
According to the Javadoc of the class But when I ran down there int[] intArray = { 1,2 }; out.println(intArray.getClas…… -
How to use webdriver selenium to get the value of the “style” element
I want to check whether the value of a style element is greater than a specific value (that is, is it > 666px?), Bu…… -
How to create a reordering tableview in JavaFX
I have a JavaFX tableview I want to allow users to click and drag to reorder table rows I can't seem to find any way t…… -
Java – Jackson, serializing a referenced attribute
When serializing Java objects with other object references, I only need to serialize one attribute of the nested objec……