Java
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Java – Custom swing components: questions about methods
I'm trying to build a new Java swing component. I realize that I may be able to find something that can meet my needs …… -
How to add a thread and other threads in Java?
I have a main thread to start 10 other threads I want to finish the main thread only after all other threads stop So I…… -
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…… -
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 – find coordinates in circles
I'm using Google maps under Grails for mashup. Users can create geonces by selecting points and radii on the map This …… -
Java – do not modify the list, but still get concurrentmodificationexception
This is not a typical concurrent modificationexception problem until you look at another concurrent modificationexcept…… -
Java – pass the file as a command line parameter and read its line
This is the code I found on the Internet to read the file line. I also use eclipse and set the file name as SANSHIN. I…… -
How to edit template documents (form letters) from files using Java?
This is my first time playing Java. I need to be able to replace some words in the template Sample template – "Dear pu…… -
Java – commons exec: when I call the executor Suspend when execute (commandline);
I don't know why I try to capture the output of the process through commons exec, and then I continue to hang I have p…… -
Java – when to use getinstanceof instead of constructor
A few months ago, I attended a speech hosted by representatives of two independent software development companies It i…… -
Java – similar to camera Parameters. Gethorizontalviewangle() and camera Parameters. What is the Android Camera2 API of getverticalviewangle()?
All this is in the title, but in the now deprecated Android camera API, there are two methods: camera Parameters. Geth…… -
Java EE – Liferay 7 service builder does not automatically update the database
In my Liferay 7 project, service builder can well generate the file tables SQL (with complete SQL), but it will not be…… -
In Java, if only the last numeric item is replaced, what is the best way to sort an integer array?
This is an array of integers Solution Take the last element as an insertion sort -
Java – dagger 2 activity injection does not work
I'm trying the new dagger 2. This is my first time to implement it, but I can't make it work I think I got the concept…… -
Can Java modules call C modules?
Just out of interest, can I call the C module from the Java module? If so, what should I do? Solution Yes, you can do …… -
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…… -
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…… -
Java – deletes the last known entry in HashMap on map
OK, so this is a different bit I have a new HashMap private Map<String,Player> players = new HashMap<String,P…… -
Using interfaces in Java New problems
Suppose you have a displaceable interface and a class circle that implements displaceable Displaceable has a method ca…… -
Java – what happened to “2017-9-21 23:59”?
I used a calender for one minute at a time But something strange happened on the date of "2017-9-21 23:59" The date ca…… -
Java method links are converted on a single line
I need to add the two values together and store them in the HashMap object as long long total = currentRowContents.get…… -
How to perform memory analysis on remote Java Web Applications
I know we can use tools like jpprofiler Any ideas? Solution You have visualgc, which is not very advanced, but you can…… -
Java – how to find an executed SQL query that does not return anything?
import java.net.URL; import java.net.URL; import java.net.URLConnection; import java.sql.*; public class searchlink{ p…… -
Java – why use the “this” keyword in constructors and setters?
Constructor is used to initialize a value and assign it to class variables when creating class instances, right? publi…… -
Java – Method override
class A class A { int i=10; void show() { System.out.println("class A"); } } class B extends A { int i=…… -
Java – why doesn’t my rating bar change the user’s touch?
I tried to add a rating bar to my campaign But I can't add or delete stars on the user's touch What should I add? <…… -
Java – when using batik in webapp on tomcat, “sax2 driver class org.apache.crimson.parser.xmlreaderimpl not found”
This may be related to the classpath problem, but I'm not sure yet because I don't have this error on some machines Th…… -
Java – lint found a fatal error when assembling the release target
I am compiling my application for publishing, and I receive an error saying: <issue id="UnkNownId" severity…… -
Default class extended by all classes in Java
In Java, by default, do all classes extend the default class? Example: if I have a simple class, such as: Class A { St…… -
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 – 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…… -
MD5 uses iso-8859-1 string hash in Java
I am implementing a digital payment service interface called Suomen verkkomaksut Information about payment will be sen……