包含标签：Java 的文章
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Java – spring data Mongo seems to ignore hosts in XML configurations
I'm trying to start and run a simple "Hello world" program using spring data and mongodb Spring seems to ignore the mo…… -
Java cannot open loop without calling Create a handler within the thread of prepare()
I've seen most of the related problems, but I can't find any solution This is my code. I don't know what I did wrong s…… -
Java – is initialization the same as null initialization?
If you declare such an object: Object x; Does it initialize to null? For example, is will (x = = null) true? Solution …… -
How to “refute” an object in Java
class DogOwner { class DogOwner { Dog dog; DogOwner(Dog dog) { this.dog = dog; } } class Dog { …… -
Java – OOP design – Private modifier
I thought I knew when to use the private keyword Encapsulation is the reason for this, so I try to keep all methods as…… -
Java observer update function
I have a class that implements the observer. Of course, it needs to have the update function: public void update(Obser…… -
Sort the object list based on different data members in Java
I have this course: public class Friend { private String name; private String location; private String temp; private …… -
Java – why is the value of “thread. Currentthread(). Isinterrupted()” false after capturing “interruptedexception”?
As a title public static void main(String[] args) throws InterruptedException { Thread thread = new Thread(new Ru…… -
Java – what type of encryption does 48 bit to 48 bit use?
I have a stack of 48 bit (6-byte) values and I need symmetric encryption These two requirements are: >The generated…… -
Java – contrary to C, why can’t you reduce method visibility when overriding?
See English answer > java, cannot reduce the visibility of the inherited method from object abstract class A { pr…… -
Java – how do I wait for CSS properties to change?
How do I tell selenium webdriver to wait on a specific element and set a specific attribute in CSS? I want to wait: el…… -
Too many Java – MySQL connections
I hate to ask a question that is widely asked on the Internet, but I can't seem to solve it I started a project after …… -
Java ThreadLocal singleton – what is it?
Laymen say, what does it mean when someone says that an object is a thread singleton in Java? I'm attending a lecture …… -
java – Arrays. Contains (int) error
May I ask why the following output is false? import java.util.Arrays; public class Test2 { public static void m…… -
Java – creating CDATA sections is confusing
I tried to create a CDATA section in the description field, but failed The code is very simple, but there is no CDATA …… -
Java – why does the execution order between printstacktrace () and other methods seem uncertain?
In the following code snippet, the printStackTrace () method is called in the catch block. After running the program, …… -
Java – PowerManager on Android devices WakeLock
I want to implement a wakelock in my Android application I have the following code in oncreat(): pm = (PowerManager) g…… -
Initializes a Java object instance that contains an array of objects
The following code is correct: public Sample mOboeSamples[] = { new Sample(1,1),new Sample(1,2) }; public Sample mGuit…… -
Java – declare int [] array without defining size?
This is my code: int[] primes = new int[25]; for (int i = 2; i <= 100; i++) { for (int j = i; j &g…… -
Is java – x Lang safe?
I often hear this question in discussions with Java developers They (Java developers) always ask if your choice is sec…… -
Java – helps create generic classes to avoid code duplication
I have a simple question. Try to use appengine to keep dry The following two functions are the same except for the obj…… -
Java – when using Grails sortedset, the first () element cannot be accessed from an empty list
I'm trying to dynamically create some Grails domain objects and then add a sortedset declared in another Grails domain…… -
Java – what are JPanel, JFrame, jlayeredpane and jrootpane
I am a novice in Java. When reading, I encountered various frameworks and panels. What is the confusion between JFrame…… -
Java – NullPointerException when trying to read parcel ArrayList
I have a class message that implements Parcelable It contains an ArrayList, and attachmentsdata is also one of my clas…… -
Java – why link string Will trim () throw an exception?
Sorry, if this is a stupid question, but I can't find an explanation I have a string like this: String str ="This is 5…… -
JavaFX – how to add a container in the anchor pane
I have a simple project that contains fxml. XML with a splitter So fxml is like this: <AnchorPane id="AnchorPane" p…… -
Java – how many elements does ArrayList add when it resizes itself?
Java's ArrayList dynamically extends itself when needed How many elements will it add when the extension occurs? Does …… -
Java – breaks a string into two at a hyphen
I get the string variable from the request String issueField = request.getParameter("issueno"); This may or may not ha…… -
java – Codingbat- Recursion1- count7
Anyone can program the next question for me (from codingbat – recursion1 – count7) Given a nonnegative int n, the numb…… -
Java – under what circumstances thread Is sleep () the best way to pause a thread?
Thread. Sleep () seems like a very useless concept to me, because the only way I see it work is in the following scena…… -
Override the list result type in Java
I want to compile some variations of this code in Java class X { List<X> getvalue(){...}; } class Y extends…… -
Java – get the class name with generic information
In the Java serialization problem, I want to save some class names. I have some problems with generic classes Any idea……