Recent Posts
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Draw a beautiful circle in Java
I'm using java graphics and I've been getting ugly This is what my java program does This is the same thing done in MA…… -
Java – Google cloud messaging: when IOS app is in the background, it will not receive alerts
I have followed this tutorial https://developers.google.com/cloud-messaging/ios/client Implement GCM on my IOS applica…… -
Is there any reason for “Boolean. True. Equals (x)” in Java?
I encountered this code in one of the projects (this is in Java) if (Boolean.TRUE.equals(foo.isBar())) Foo#isbar() is …… -
Java – using variables in JSTL parameters
Is there any way to specify variables as parameter names in JSTL, that is: <c:set var='myVar' value='dynamicParamet…… -
Declare enumeration variables in Java beans
I need to declare an enumeration variable as a class member and define a setter and getter for it like a java bean Som…… -
How to get the decimal value of Unicode characters in Java?
I need a programming way to get the decimal value of each character in the string so that I can encode them as HTML en…… -
Java – implement the equals method using CompareTo
General question: when implementing the override of a default equals method in Java, how should the implemented Compar…… -
Why is this possible in Java: this getClass(). getClass(). Getclass()… Etc
Why is this possible in Java: this.getClass().getClass().getClass().getClass()... Why is there such infinite recursion…… -
Tools for monitoring java thread execution
I have a Java Web application running on a Tomcat server (Linux) In the production environment, I encountered some per…… -
Java – I should use “_activity = this;” Are you?
I should use "_activity = this;" Are you? I see multiple references in the sample code_ activity. So I decided at rand…… -
Java converts strings to XML and parses nodes
See the English answer > how to parse a string containing XML in Java and retrieve the value of the root node? 6 Do…… -
Java – why do generic types have the same signature?
I have the following generic classes: class Or<A,B> { Or (A a) {} Or (B b) {} } Why do I get the following e…… -
Declare mat in opencv Java
How to create and assign a mat using java opencv? The C version starting from this page is Mat C = (Mat_<double>…… -
Java – keylistener does not work properly after clicking the button
I have a keylistener attached to my framework in Java. I can detect the key when the key is pressed, but strange thing…… -
Java – deadlock on synchronized (string intern())
My user sun JDK 1.5 ThreadPoolExecutor (24,24,60, timeunit.seconds, new linkedblockingqueue()) Soemtime I use the JDB …… -
java – org. springframework. jdbc. Incorrectresultsetcolumncountexception: incorrect number of columns: expected 1, actual 38
I'm using jdbctemplate to retrieve beans from DB This is my way public List<trackerv3Livedata> getTrackerData()…… -
Date java was installed using calendar
I want to know if there is an existing enumeration that contains all working days in Java I'm using calendar to handle…… -
Jbas015852 cannot index class java Lang.illegalstateexception: unknown token
This error occurs when deploying to the local JBoss server Is there any way to solve this warning? The explanation of …… -
How to simulate javax servlet. ServletInputStream
I'm creating some unit tests and trying to simulate some calls This is what I have in my working code: String soapRequ…… -
Java regular expressions replace all words without replacing all words
I have been using this regular expression in Java for many years and can't make it work: (?:^| )(?:the|and|at|in|or|on…… -
Java – the difference between string [] A and string…… a
What is the difference when we write string [] A in the main method and string? a？ public static void main(String[]a)…… -
Why does the switchcase statement in Java work like this?
See the English answer > why can't I switch on a string? 13 Solution Usually, the problem of language design comes …… -
Java – swing – JTable – sets the color for the selected row, but not for the cell
I try to make my table select the entire row when you click a cell (this can be done by turning off column selection),…… -
What is the difference between FileInputStream and bufferedinputstream in Java?
What is the difference between FileInputStream and bufferedinputstream in Java? Solution Main differences: >Buffere…… -
Java – toArray (t []) method in ArrayList
When I implemented it through ArrayList, I found a strange piece of code in the toArray (t []) method public <T>…… -
java – Apache Hadoop setXIncludeAware UnsupportedOperationException
I tried to run Apache Hadoop 1.21, but I got this exception: Failed to set setXIncludeAware(true) for parser org.apach…… -
How to force a program to always run the first iteration of a while loop?
I am writing a program to implement the algorithm I found in the literature while(solution has changed){ updateSol…… -
Java – get font, size, bold, etc
I can't find anything to access windows fonts or predefined fonts and sizes So for my java program, I have one JCombo@…… -
Java – can we use @ Autowired in JSP? If so, what?
I am building a web application using spring and hibernate Solution If you are using spring MVC, you can pass your ser…… -
Check each bit in the byte array with Java?
So I have a byte array, and I have a function to check whether the nth least significant bit index of the byte array i…… -
Java ServerSocket connection restrictions?
I'm using sockets for some tests. I've encountered some strange behaviors: after the 50th client socket is connected, …… -
java – Apache Hadoop setXIncludeAware UnsupportedOperationException
I tried to run Apache Hadoop 1.21, but I got this exception: Failed to set setXIncludeAware(true) for parser org.apach……