包含标签：Java 的文章
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Java – nullpointer exception in LinkedList when using for each loop
I encountered very strange Java behavior. I don't know whether it is a bug or not The code simply passes through the s…… -
Create a unique timestamp in Java
I need to create a timestamp (in milliseconds) in Java that is guaranteed to be unique in this particular VM instance …… -
Java – if called in the synchronization method, thread. Will yield() lose the lock of the object?
I understand thread currentThread(). Yield () is a notification thread scheduler that can assign CPU loops to other th…… -
Java – hibernate validator, custom resourcebundlelocator and spring
I tried to override the default resourcebundlelocator in Hibernate authentication 4.1 So far, it works perfectly, but …… -
Java – why does the attribute change listener instead of observable
I had problems with class design until I found observability (using the observer design pattern) and created a small a…… -
Java – how do I subclass ByteBuffer?
Therefore, the Java NiO architect does not create a ByteBuffer interface, but a ByteBuffer class. It is not a final cl…… -
Java – why does the following code compile without errors?
I am new to Java and try to understand the following The length of the array is different The code still executes with…… -
Java error when combining Lambdas and multiple catch clauses?
import java.io.*; import java.io.*; import java.net.*; public class Test { …… -
How to specify the encoding of Java source files?
I used strange Unicode strings in java test cases The compiler seems to interpret the file as ISO - 8859 - 1, causing …… -
Java – jarscan, which scans all jar files of a specific class in all subfolders
We are seeing an older version of the class being used, although we have the latest deployment To scan all jar files i…… -
Java – the deleted entity is passed to the persistent exception
I have such entities: I'm just trying to delete a file, such as entitymanager Remove (file); However, an error occurre…… -
What is the preferred way to get the frame rate of a JavaFX application?
This is a very simple question: What is the preferred way to get the frame rate of a JavaFX application? Google showed…… -
Java – change string constants in compiled classes
I need to change the string constants in the deployed Java program, that is, compiled Class file It can be restarted, …… -
Java – bypassing generatedvalue in Hibernate
It is possible to bypass the ID of @ generatedvalue in hibernate. We have a case where we want to use generatedvalue t…… -
How to delete data using sets in Magento ORM?
Now I'm deleting data $deleteCCL = Mage::getModel('crossdata/customccitem'); $deleteCCL->load($itemId); $delete…… -
Java jar ant include folder
My question is: how can I put files into subdirectories into my jar through ants? Now my code is: <jar destfile="${…… -
Can two Java interfaces be mutually exclusive?
I have two interfaces that should be excluded: interface Animal{} interface Cat extends Animal{} interface Bird extend…… -
Java – log4j2 why log4j?
I must miss something, but now I've been watching it for a few days, but why can you use log4j2 (not performance) befo…… -
Java – JUnit test passed, but pit indicates that the suite is not green
When trying to run pit mutation test, I received the following error: When I do the normal test build, the tests run w…… -
Java – spring: exception start filter springsecurityfilterchain
I'm using spring 3.1 Write an application with 2 - release The app server is Tomcat 7 This is my profile: web.xml <…… -
Java – how to use GridLayout to set component size? Is there a better way?
I'm using java to develop a bigger GUI, and I'm getting angry with the layout manager I have a "settings panel" that c…… -
How do I change the default class loader in Java?
Suppose I have three classes, classA, example ClassB and example ClassLoader. ClassA prints out HelloWorld and ClassB …… -
What are the security implications of deserializing untrusted data in Java?
Can I safely deserialize untrusted data if my code has no assumptions about the state or class of the deserialized obj…… -
Java – how to reschedule tasks using scheduledexecutorservice?
I saw this in Java docs: scheduledatfixedrate I don't want this to happen in my application Even if I see an exception…… -
Java – why is setname in the thread class assigned to a character array? Why not a string?
When I deal with the thread concept in Java, I have seen thread Java source file I noticed that the setname () method …… -
Java – which eclipse files are excluded from subversion repo
As a development team, we always like subversion and solar eclipse. We checked everything and everything was fine Unti…… -
Java – addfirst method of arraydeque class
java. util. The code for the addfirst method in the arraydeque class is public void addFirst(E e) { if (e == null)…… -
Java – a better way to design this algorithm?
I'm working on a more complex version (the vehicle moves in X and Y directions) I did this example to get a better way…… -
Java – interpret scientific symbols as int or float?
If I use scientific symbols (such as 1e9) to encode a number in my code, the type of the number will be (int, long, fl…… -
Java – MySQL jconnector on COM myql. jdbc. utils. ReadAheadInputStream. Spend 50% of the time in fill()
I'm profiling my application, which uses spring hibernate MySQL Java connector Visual VM shows that when 1000 parallel…… -
java. text. Strange behavior in simpledateformat, expecting yyyymmdd to give yyyy MM DD
When using simpledateformat to parse strings to dates, I encountered a very strange behavior Consider the following un…… -
Java – OutputStream outofmemoryerror when sending http
I tried to publish a large video / image file from the local file system to the HTTP path, but after a period of time,……