Recent Posts
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Use volatile to ensure the visibility of shared (but not concurrent) data in Java
I'm trying to implement a fast version of LZ77. I have a question for you about concurrent programming Now I have a fi…… -
Java – packed numeric array
I have a large array (~ 400.000.000 entries) with integers of {0,1,..., 8} At present, I use byte array and save 2 num…… -
Java – system Setout redirects back to standard output
System. Setout redirects standard output For example, FileOutputStream f = new FileOutputStream("file.txt"); Syste…… -
Java code for calculating the number of nights in the date range (00:00:00)
I'm trying to write a Java block to find noon in a specific date range For example: Start date: 05 / 01 / 2014 00:00:0…… -
Java – intentional loss of precision
When converting double to int: double d = 5.5; int i = (int) d; Variable "I" becomes 5 This is exactly what I want. Th…… -
Java – how to read and display large text files in swing?
It may sound a little complicated. I'll try to simplify my requirements At present, I am using the standard reading me…… -
Java – how does the competitive condition in toctou work?
The following code should be vulnerable to toctou attacks: public Period(final Date start,final Date end) { if (st…… -
Java – why are caps not sorted correctly here?
I'm trying to sort items in list < string > This is an unordered list and how it is currently sorted: Unsorted: …… -
Java – how to prevent JComponent cleanup?
I'm making a molecular design application I can draw lines and circles, but it clears the old lines every time I click…… -
Java general Observer mode to achieve the original type is not selected.
I'm currently trying to take advantage of the general implementation of observer mode in Java. I find it seems to work…… -
Java – gradle build dependency throws classnotfoundexception
I am currently writing my first gradle build script to help build a simple java application from the command line Here…… -
Java – datastex querybuilder insert statement
What is the correct way to build insert statements using querybuilder from datastex Java driver for Cassandra I'm usin…… -
Java – outofmemoryerror commented out from seemingly unrelated code blocks
Can anyone explain why the program throws an outofmemoryerror when the for loop is commented out? If it is uncommented…… -
How to build a copy function map in Java’s lambda API
From the Java. Net that maps a pair of enums to values util. function. In bifunction, I want to build an enummap that …… -
Java – StringBuffer class and Chinese character encoding
I wrote a method to return a string containing Chinese characters public printChineseMenu(){ StringBuffer buffer; …… -
A Java method that can only be called by its own class or other subclasses
I want my class to have a method that can only be called by itself or its subclasses The closest is protected access, …… -
Java – call thread What kind of corruption may occur when the stop method is used?
See the English answer > thread Stop () – deprecated 4 I just don't quite understand What does an inconsistent stat…… -
The Java compareto() method returns ClassCastException
Suppose I have an employee base class and a manager subclass, which extends employee Now suppose I create an object x …… -
Java – avoid using the final method when using mockito for unit testing?
Mockito is not allowed to laugh at the final method I don't want to change the implementation details just to make the…… -
Java – convert binary strings to binary
How to convert a string written as binary to binary (byte array)? If I have a string: String binary = "0000" I want th…… -
Java – URL encoding / decoding replacement space on file name, which needs to be replaced
My product is a web application Solution You can also convert spaces to See: URL encoding the space character: + or% 2…… -
Java – why do many projects only provide source code instead of downloaded jars?
I've seen a lot of projects, including resources provided by big companies such as elephant bird (twitter) and Akela (…… -
Synchronize queues in Java on multiple threads
I understand the concept of synchronization, but now I'm sure why it's implemented in this way, so I need a little hel…… -
Java – Error installing JDK
The following error occurred while installing JDK 1.7 on Windows 8 I downloaded the latest version of JDK from Oracle …… -
Java – the best layout / nested layout for this structure
I'm new to swing. I'm trying to create an interface, such as: ——————————The text text of the information text 124124 1…… -
Java: implicit conversion of object at compile time does not work, but reflection can be used
The following codes are given: import java.lang.reflect.Array; import java.lang.reflect.Method; public class Test { …… -
Do you need to explicitly close the Java keystore input stream?
When using FileInputStream to read the following in keystore, do you need to explicitly close the input stream to stop…… -
Java – click the close x button to close the frame
I have got the answer through link1 and link2, but it doesn't help because frame.setVisible(false); The following exce…… -
java – android. support. v7. widget. GridLayout cannot be instantiated
I'm trying to use GridLayout in my project, but ideally I use the Android support library, so I can locate a lower ver…… -
Mirrored shapes in Java (swing)
hello everyone, I have a lesson about drawing and manipulating shapes in swing GUI I have a problem. When I try to mir…… -
Java – a better way to implement an empty while loop to maintain control
I'm playing the background audio. I want the control of the program to remain stationary until the audio playback is o……