Recent Posts
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Multithreading – passing qlist * to signals from qthread
In my QT application, I have a class called from an object running in a thread In my worker class, I created qlist, ju…… -
Java – how to add a map entry to the ArrayList?
I'm creating an ArrayList of map entry key value pairs In this way, I can store a large number of individual words (as…… -
Sonarqube and Java plug-ins are installed, and there are no rules under the quality configuration file
I have installed sonarqube 3.7.0 for it 3 and all related Java plug-ins Under the quality profile tab, I can't find an…… -
Java – why can’t I use multiple type parameters with wildcards?
For example, why can't I do this (I1 and I2 are two interfaces): List<? extends I1 & I2> myList; Note that I…… -
Java – JBoss application server and Servlet
I downloaded the latest version of JBoss. Com from JBoss website I created a dynamic web project and created a servlet…… -
Java – convert timestamp to UTC time zone
public static long getCurrentEpochTimeStamp(String timeStamp) throws Exception { public static long getCurrentEpochTim…… -
Java – OSGi / equinox, declarative services and deferred loading
I'm trying to use declarative services to create a service package to provide functionality for another package Howeve…… -
Java – AES encrypts Android < - > different results of IOS, and the message length is > 15 bytes
I had a real problem understanding the password / encryptor on both devices 1. If we use cipher AES to encrypt message…… -
Java – double quotation marks in Python, such as triple double quotation marks in Python
In Python, I can use: test = """My "cute" string""" Where double quotes are escaped Is there a way to simulate this in…… -
Java – I get a dead code warning when I try to write an if condition
I received a dead code warning: Topic topic = findTopicByID(point.getIDTopic()); if (topic != null) { ... } else i…… -
Java – StringBuilder using string instead of StringBuilder
I use StringBuilder instead of string in my code But when I look at its source code, the substring () method abstracts…… -
How do I add subcomponents and new properties to a custom JavaFX control?
I want to create a new JavaFX component and use it in fxml How do I define the usage possibilities and subtypes of thi…… -
Prestodb – Presto API options other than JDBC
In addition to JDBC, there are all other options for getting data from hive to the user interface through the Presto q…… -
Java – how to add a method to a source file without editing the source file?
I'm trying to add a method to the minecraft source file, but I have to figure out how to do it without actually editin…… -
Java – the watershed in opencv Android
I try to implement the watershed function of OpenCV on Android But my program always crashes where the watershed funct…… -
Java – delete duplicates from ArrayList?
How do I remove duplicates from ArrayList? I have getccnptags array as [Java, PHP, C, Java, PHP]. I get the hyperlink …… -
Java – is it correct to use ArrayList or LinkedList instead of list when declaring variables / parameters?
See English answers > type list vs type ArrayList in Java 15 public class foo { private List<String> fooT…… -
Failed to delete duplicates in array using ArrayList
I want to remove duplicates from the array by using the array list The code seems to work in all cases unless the stri…… -
JavaFX table columns have different fonts from CSS
I want to set different fonts (actually just italics) in a column of the JavaFX table col.setCellFactory(TextFieldTabl…… -
Java – traversal object array list
I am using native SQL to query with the following code private <T> List<T> executeNativeQuery(String query…… -
Java – headless painting
I want to draw JPanel as buffered image in headless mode (there is no GUI on the screen) final JPanel panel = createPa…… -
Java – c3p0 prepared declarations are closed for no obvious reason
I'm using c3p0 I created a collection as follows, cpds = new ComboPooledDataSource(); cpds.setJdbcUrl(...); /* connect…… -
Java – get JPopupMenu size before display
I click the right mouse button to display JPopupMenu I want the top right corner of JPopupMenu to be in the click posi…… -
Java – unable to get the selected item index in the custom arrayadapter on the listview
There is a problem with my android project because I can't get the selected project index from my list using my own ar…… -
Java – is there any way to set a “/ / $non-nls” comment for all strings in one line?
Does anyone know if you can set a / / $non-nls annotation tag for all strings in a line in Java... It might be like th…… -
Java – calendar gettime() returns only est
Calendar cl = Calendar.getInstance(TimeZone.getTimeZone("America/Los_Angeles")); Calendar cl = Calendar.getInstance(…… -
Using other modes except ECB and decrypting with DES will throw “invalidkeyexception: missing parameter”
I basically use http://www.avajava.com/tutorials/lessons/how-do-i-encrypt-and-decrypt-files-using-des.html The code en…… -
Java – how to delete all child rows when deleting a parent using Hibernate?
I have two tables // Accounts @OneToMany(mappedBy="accounts",cascade=CascadeType.ALL) @Cascade(org.hibernate.annotatio…… -
Java – swing JTable sorted by date
I want to sort jtables by date in a column, but only display dates in DD mm yyyy format So all entries are the same, b…… -
The DB2 Java stored procedure call returned an error sqlcode = – 440, sqlstate = 42884
I am making a simple stored procedure call to DB2 Although it calls the stored procedure, it always returns this error…… -
Java inaccessible wsdlexception when accessing WSDL through client stub
I'm trying to write a custom java client for exchange web services Exception in thread "main" com.sun.xml.internal.ws.…… -
Java backward compatibility description
I have a Java class file I compiled with JVM 7 I implemented Java 1.7 additions, such as string switchcase and diamond……