Recent Posts
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Java – running startup. Java in Linux SH rejected [closed]
I tried to run Tomcat 6 in Linux when I called startup SH, I'm in Catalina See this error in out /home/***/apache-tomc…… -
Java – how to create a circle with numbers?
I'm using andengine to program Android games I want to create a circle with numbers, as shown in the figure below: Sol…… -
Java – just run unit tests. What source code has changed?
I run unit tests and selenium tests on Jenkins CI server As we all know, testing takes a long time to run in large pro…… -
Java – scanner and inputstreamreader
Does anyone happen to know the performance difference between the following two methods of reading input files? 1) Rea…… -
Java – JPA does not generate “on delete set null” FK restrictions
I have two related terms JPA notes Alarms and status An alarm can have a state What I need is to be able to delete a s…… -
Java – use random What is the importance of setseed?
When writing Java programs, we use setseed. Com in the random class Why do we use this method? Can't we use random wit…… -
How to create a file in Java?
I'm trying to implement the following operations in Java. I don't know how to: /* * write data (Data is defined in my…… -
Java – how do I check if BigDecimal is in a scale independent manner in a set or map?
BigDecimal's equals () method is also relatively large, so new BigDecimal("0.2").equals(new BigDecimal("0.20")) // fal…… -
java. sql. Timestamp comparison error?
See English answer > java sql. Timestamp created from java. util. Date,why always before() it? two Date d1 = new ja…… -
Java – error upgrading Cordova application
For security reasons, I'm trying to get from Cordova 3.5 0 update a phone app to Cordova 5.1 one W/System.err( 1672): …… -
Java – what happens when you look in a HashMap or HashSet when the object hashcode changes
In HashMap, the hash code of the provided key is used to put the value in the hash table In HashSet, hash codes are us…… -
Java – “when creating a simple RMI application,” ClassCastException: $proxy0 cannot be converted “error
I am creating my first very simple RMI client - server application This is the code: Interface "communication" package…… -
What is the order in which initialization blocks and variable definitions are executed? (in Java)
I understand the order in which initialization occurs This is my hypothetical order: *Once per 1. Static variable…… -
Java – EJB and CDI and entity boundary control mode
I try to understand CDI and EJB and entity boundary control (ECB) patterns My understanding of ECB mode is that bounda…… -
Java – when excel (. Xlsx) is converted to PDF (. PDF) using open office, there are missing worksheets and page size problems
I have created an application using jodconverter and open office to convert excel (. Xlsx) to PDF. The application wor…… -
Java – attempt to read NullPointerException of parcel string []
When I create an object from parcel, when I try to read back a string [], I get a NullPointerException This is my code…… -
Java – get random elements from a sequence collection
I talked about an API and gave me a Java util. A collection of iterators This means I can iterate over it, but I can't…… -
Java – I can do it without commons logging Using Apache httpclient in the case of jar
I'm trying to use Apache http client.asp in my project No logging for this application is required here So I can do it…… -
Java – session variables in ServletRequest
I need to access session variables through a filter I don't even know if it's possible In fact, the problem comes from…… -
Java – always keep the mutable objects sorted in the TreeSet
I noticed that TreeSet does not keep mutable objects in sort order if the object property value changes later For exam…… -
Java – different “getdocumentelement” and “getfirstchild”
I have the following document objects – document MyDoc MyDoc holds an XML file myDoc = DocumentBuilderFactory.newInsta…… -
Java – autocomplete jtextfield and arrow keys
I'm trying to use javax swing. JList builds a javax swing. Jtextfield, used for automatic completion, such as Google W…… -
Java – establish a two to many relationship in JPA / hibernate
I have the following physical relationship issues The game must have two (only two) team objects "Team" can have many …… -
Java – add the click handler to the horizontalpanel in GWT
How to add a click handler to the horizontalpanel? It uses adddomhandler () in the newer version of GWT, but I had to …… -
Is declaring many of the same anonymous classes a waste of memory in Java?
I recently browsed the following code snippet in the current code base and added the comments you saw there I know thi…… -
What do comments in Java – IntelliJ source code mean?
When looking for the source code of the IntelliJ idea Community Edition project in GitHub, I found the following symbo…… -
Java – how do I check the JDK version in oracle?
We have a Java class in Oracle database. Recently, an error was raised in a line of code in this class: static BASE64E…… -
Java – try to log in to XMPP server with smack result and “unauthorized” in SASL
I tried to log in to the XMPP server using smack When I try to log in, I receive the following error message: I have b…… -
Java – GC Optimization: for vs foreach
I've been trying to optimize some of my code and got a strange conclusion about fors In my test case, I created a new …… -
Java – Mozilla rhino tutorial
Any one can provide a good tutorial for Mozilla rhinoceros What I want to do is use JavaScript to validate the form in…… -
Java – will the result of modifying getter affect the object itself?
I have a question about using getter methods in Java My question is: Will the actual array list object be modified ("t…… -
Java – passing space delimited system properties through shell scripts does not work
I have this bash file: #/bin/bash PROP="-Dprop=foo bar" java $PROP -jar Foo.jar Therefore, what I want to do here is……