包含标签：Java 的文章
-
Unexpected negative number in Java
import java.util.*; import java.util.*; public class Prac9FibonacciNumbers { public static void main(String[] arg…… -
RX Java – cancel observable in rxjava
I have an observable object that is performing a download However, when I click the button, I want to cancel the obser…… -
Multithreading – parallel execution of computationally expensive mappings
I'm new to the reactivex Library (I use its Scala variant, RX Scala) I have an observable that sends values at a high …… -
Symfony – @ uniqueconstraint and @ column (unique = true) options differ at the doctrine ORM level
At the database level, there is no difference in defining uniqueness with one option instead of another, as shown belo…… -
Java – how to link an object to a thread so that wait() and notify() work
In Java, object and thread are separate classes Although we have wait () / notify () methods, the Java object source c…… -
Java – neo4j connection string
I use neo4j as the graphic database of my research papers. It is difficult for me to put neo4j2 3.1 connect with simpl…… -
Java – inheritance aware class for mapping to replace the ‘instanceof’ series
I'm looking for some magical class map utilities that give a type and return the value associated with that type or it…… -
Java – what’s the difference between creating objects in these two ways?
I want to know the difference between these: 1-) JFrame frame = new JFrame(); JLabel label = new JLabel("example"); fr…… -
Java – the difference between defining variables inside and outside a loop
In terms of style or performance, is it better to define variables inside or outside the loop? For example: int var; f…… -
Java – moves characters in a string to the left
I'm a novice at stack overflow. I have a lab problem with a programming class that has been avoiding me The problem re…… -
Set the timestamp to the current time in Java
I'm trying to set the current date and time in the Java ee7 web application to my Apache Derby database I use time sta…… -
Java imageio grayscale PNG problem
I have a grayscale image (actually "Lena") and I want to try it out I regard it as 512 × 512 PNG files, 216 kinds of g…… -
CPU – what is a clock interrupt?
I can't find the correct definition of this on the Internet >Does every clock tick happen? > Does it happen ever…… -
Java – use the stringtokenizer to return the rest of the string
After watching it for more than an hour, I can't seem to find a way to achieve this If I do StringTokenizer sTokenizer…… -
Java hashtable non constant time operation
I am currently learning the hash table in Java. I have questions about the operation and performance speed of the hash…… -
Java – is webdriver a class or an interface?
Starting with selenium docs, webdriver is an interface, but in eclipse, org openqa. Selenium packages are displayed in…… -
What is a good use case for Java beans?
I just saw the Java beans specification I think using only getters, setters and empty constructors will make the code …… -
Java – invalid from phone number with us number
I am a novice of twilio and try to send text messages using Java API As I saw in other sof posts, I posted my first lo…… -
Implicit type conversion of Java – lambda expressions
Consider the following courses: public void method() { test(() -> { }); } void test(Runnable a) { System.o…… -
Java – use the same fragment multiple times in the same activity / layout
Not a 100% term, so please be patient I have an activity to compare two items side by side, one on the left and the ot…… -
Java – am I right? I’ve been collecting compiler errors
I'm not sure if I write correctly I checked my notes to make sure I used all the appropriate symbols, but I've been re…… -
Java randomization – (minus sign) and (plus sign)
Is there any way to add a plus or minus sign randomly? I have a program in which an elf moves on the screen. When you …… -
Java – JPA or hibernate generates (non primary key) column values instead of starting with 1
I want a JPA / Hibernate (preferably JPA) annotation that can generate the value of a column. It is not a primary key …… -
How to refactor this HashSet in Java
I'm new to Java I have a HashSet method. I want to know a better method to encode the following code: public HashSet&l…… -
Java – HashMap places duplicate values unnecessarily
I have the following code. I want to insert the result into the database, but now I just want to print out the key wit…… -
Java – eclipse Mars toolbar entries have several blanks
I have updated the moon from the moon to Mars, and there is a big gap in the toolbar entries Right clicking a toolbar …… -
Java: can wildcard array types be used as parameters and return types?
For example, consider a function that accepts the ArrayList of strings, splits it into string arrays, and returns the …… -
Java – selenium webdriver: cannot find element in iframe using TinyMCE editor
Maybe my problem is similar to this selenium webdriver cannot locate element within an iframe, and throws NoSuchElemen…… -
Java – how to encode stream findNth()？
And stream Similar to findfirst(), is there any way to write stream findNth()？ I'm practicing Java 8. 0 by rewriting …… -
Java – flyway 3.1 migration checksum mismatch The calculation of the checksum depends on the platform
I have exactly the same project source and SQL script on windows and Ubuntu clients and development platforms Cause: o…… -
Java – why does the @ requestmapping spring annotation in the controller capture more of what I want?
I have a simple spring controller and mapping: @Controller public class HomeController { @RequestMapping(value = "/hom…… -
Java – how to get the number of characters in jtextarea?
I have a jtextarea. I need to convert the character of each field to another character So I thought of a simple cycle:……