Recent Posts
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java – org. elasticsearch. client. transport. Nonodeavailableexception: no configured node is available: []
I run elasticsearch on docker, which is available locally $curl http://192.168.99.100:9200/?pretty { "status" : 200,…… -
Java – on COM sun. Using generics in codemodel
Use COM sun. Codemodel, I want to generate a generic LinkedList field I can create an original field using the followi…… -
Java me – J2ME app and browser on mobile phone
Recently, I started to develop J2ME app prototype I noticed how difficult it is to develop a nice user interface Consi…… -
Java: how to get the connection port from InetAddress?
I'm trying to use Apache Mina to build a socket server based on Java NiO I really need to know the port of the remote …… -
Java – how do I get the file list from the SFTP server?
I have a problem and hope to get a solution I also wrote some code, but I need to make some changes Question: I have a…… -
Java – structured stream exception when using additional output mode with watermark
Although I am using watermark (), when I run my spark work, I receive the following error message: From what I saw in …… -
Java – a faster way to find the key for a given value from the map?
I want to find the key of a given value from HashMap. At present, I have to pass all keys and check its value in the m…… -
Java-8 – Java 8: filtering and mapping on the same method output
We try to refactor the following code into Java 8: List<String> list = new ArrayList<>(); Iterator<Obj&…… -
java – boolean. Isinstance (true) is false?
problem Class objects of Boolean fields do not recognize other Boolean values as instances code public class Test { …… -
Java mail API: send e-mail through enterprise outlook account
I want my program to be able to send e - mail from my corporate outlook account I've seen many examples of JMA, which …… -
Java – sum of substrings of numbers
What is the best solution to find the sum of digital substrings? For example, sum (123) = 1 2 3 12 23 123 = 164 I thin…… -
10 Ethernet in Java?
Does Java 6 support 10 gig Ethernet out of the box? It doesn't seem to require Java changes, but I think I remember th…… -
How to round 0.0 to 0.00 in Java?
I use the following functions float val=0.0; DecimalFormat toTheFormat = new DecimalFormat("#.##"); float value=Float.…… -
Java – why does my jdialogs leak?
I have a JFrame from which I open a jdialog and another jdialog – menas from the dialog. I have three windows visible …… -
Base-n series generator for a given number in Java,
I want to create a program to generate a given base-n series, Is there any general mechanism to find these numbers so …… -
Java – hibernate comment, specifying column defaults
I have a domain object with the following comments @Entity @Table(name = "REQUEST") public class Request { /** …… -
Java – peek() actually sees the element flow through a point in the pipeline
My question is expressed in the simplest way: According to Javadoc: I have a 10 meter pipe, 3 to 7 meters away from th…… -
Java – abstract base class in dart
I've been programming in Java for nearly two years, but now I'm turning more to web programming, so I'm turning to Jav…… -
Java – why does the shift right operator produce zero instead of one?
I'm learning Java by myself. I practice in thinking in Java On page 116, exercise 11, you should move an integer right…… -
Java compiler replaces StringBuilder with concatenation
Here are some simple java code: String s = new StringBuilder().append("a").append("b").append("c").toString(); I compi…… -
I have the following java code problems
public class b { public class b { public static void main(String[] args) { byte b = 1; long l = 12…… -
Java – how to read a user’s char on the command line
How to read the user's char from the command line I am familiar with readint() There is no such thing as character Thi…… -
Java – is there any way to test 2-way SSL through the browser?
If so, how to set the authentication certificate and what files do you need? Yes pfx？ How would you install it in you…… -
Java – meaning of API
Anyone can tell me the meaning of API in the following paragraph, which is actually about transfer object: Thank you i…… -
Java – can multiple @ qualifier annotations be used in spring?
I have a set of beans that feature two properties They are basically serializers for different classes and purposes Fo…… -
Java – find two pairs from an array of integers in two elements
Two pairs: if there are two pairs of dice with the same number, the player scores the sum of these dice If not, the pl…… -
Java – switch statement, which defaults to the previously defined switch case?
I want to do something like this: int i = 0; switch(difficulty) { case 1: i++; break; case 2: i--; break; …… -
Java – looking for numbers greater than the average – why doesn’t my if statement work properly?
I'm testing a program that contains different text files of randomly generated numbers The Java program is built to ad…… -
Why should I use null (string []) in Java?
In some fragments, I noticed that the array is initialized by converting null values into string arrays, such as: Stri…… -
Java – refactoring a simple populated long method
I'm refactoring a method with more than 500 lines (don't ask me why) @ h_ 403_ 7@ public List<Hashmap> getProduc…… -
Java NullPointerException for null condition check
I have a very basic method as part of the binary search tree. If the current binary node has a correct child node, it …… -
Find a method in the Java logging framework scenario
Java has many frameworks / APIs to help you log in to your application: >The Java API has java util. Logging packag……