Java
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How to use array type generics in Java?
In Java, I want to create a function that accepts any type of content list and then returns an array of the same type …… -
Does the latest Cassandra support openjdk?
In the GitHub readme, it says > = 1.7 (openjsk and sun) was tested But when I look at Cassandra daemon Java, there …… -
JavaFX – how do I have tabpane populate its parent?
My tabpane seems to fill its width horizontally, not vertically My solution now is to do this: stage.getScene().height…… -
Java – can we initialize an object with the help of the constructor of another class?
Can we initialize an object with the help of the constructor of another class? class1 object = new class2(); Solution …… -
Java – print out the elements in the array that occur the least
I get an array of size 10. I want to write a program to print out the elements with the least number of occurrences an…… -
Java – custom Jackson unmarshalling behavior
I use Jackson fasterxml to ungroup JSON There are two kinds of properties in my object: input properties and calculate…… -
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 – 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 – does programming with JDK 7 allow applications to run on JRE 6?
I program in eclipse I will never change eclipse's default compilation settings or anything else If JDK 7.0 is install…… -
Java – calculate which side a line is on
I need to figure out how to calculate which side of a line I am looking for a very fast and simple collision algorithm…… -
Java – dynamically create groovy classes
Given a class name, I want to dynamically create a groovy class and add properties and methods to it I use to create n…… -
How to embed Base64 images into e-mail using JavaMail
I'm trying to send email from JavaMail using embedded Base64 images (IMG ALT = 'image PNG' SRC = 'data: image / PNG; B…… -
Why is user-defined exception class preferred / important in Java?
When we have system defined exception classes in Java, why do we need to create user-defined exception classes? Becaus…… -
hazelcast – java. lang.NoSuchMethodError：com. google. common. util. concurrent. MoreExecutors. sameThreadExecutor
Try: mancenter-3.1 3. When war is deployed to my Weblogic 12, I receive the following exception Fullstacktrace is: org…… -
Import local Java classes into clojure
I understand the general idea of importing Java classes in clojure, as follows: (import 'a.random.Class) However, supp…… -
Timestamp and time zone conversion in Java and MySQL
I am developing a Java application with MySQL database on a server located in a different time zone from me. I am tryi…… -
Java – Jersey records all response times of the service
I have a Java application and I want to record all execution times of each rest service How to measure the execution t…… -
R. Do all x elements exist in Y
In R, how to test the elements of a vector that does not exist in another vector? X <- c('a','b','c','d') Y <- c…… -
Java – compare 2 integers, strange behavior
See the English answer > why is 128 = = 128 false but 127 = = 127 is true when comparing integer wrappers in Java? …… -
Java – how do I set alerts that are always displayed?
Now, I just want to get some kind of battery status indication when the user accesses the application For example, if …… -
Java – reload via array
So suppose I have an array of length 5 (let's call it myArray [5]) If I add 4 to myArray [3], such as myArray [3, 4], …… -
When should I use POJOs (not EJBs) in Java EE applications?
I am currently learning Java EE I use Oracle Java EE 7 tutorial According to section 34.1.1 of this tutorial In Sectio…… -
Java – how to replace a JPanel with another JPanel in the same location?
I have a JFrame of about four frames After a given action, I want to replace one panel with another in the same positi…… -
Java – reduce the recording of the same exception
Is there any smart way to reduce the record of "equal" exceptions? For example: java.lang.IllegalArgumentException: Wr…… -
Java – algorithm for bucket lookup of hash code
See English answers > What hashing function does Java use to implement hashtable class? 5 When the lookup is comple…… -
Java – JBoss wildly and Jersey web service deployment error jbas011859: naming context is read-only
I am using Jersey servlet (1.18.1) to process Java Web services projects When I deploy my ear file to JBoss wildfly (8…… -
Java – protects int, visible only to the specified method
Is there any way to make me invisible to other methods in the same class? private int i; private void updateI(int i) …… -
Java – how to fix com mysql. jdbc. exceptions. jdbc4. Mysqlnontransientconnectionexception: no operation is allowed after the connection is closed Exceptions?
This is a query for my records public void saveTotal(JTextField txtGtotal,JTextField txtPTotal) { try { Re…… -
The Java 8 stream aggregates a map
I tried to do something that seemed straightforward, but so far I have no luck I have a list of maps from a bunch of p…… -
Java string finder – how do I switch case sensitivity?
I have a method to search the file for the string you give it and return a count But I have a case sensitivity problem…… -
Java – missing datasource explorer in eclipse Kepler
I recently downloaded eclipse Kepler Datasource Explorer is missing in this version of Kepler Datasource Explorer can …… -
Java – bitwise OP unexpectedly becomes negative
Can someone explain to me why I got these results? public static int ipv4ToInt(String address) { int result = 0; ……