Java
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String concat speed in Java
I'm rapidly prototyping the SQL query instead of doing it in the right way. I just decided to attack it with a bunch o…… -
Convert Java char in string to lowercase / uppercase
I have a string called "original string", which contains a sentence with a mixture of uppercase and lowercase characte…… -
Java – is this a good if block?
Can these comparisons always safely create nullpointer exceptions? if( myObject == null || myObject.someMethod() == so…… -
How to use the between clause in Kohana ORM
I'm new to Kohana I'm using ORM to get data I want to build a query where the between clause exists as follows SELECT …… -
Java – how do I update jlabel text?
I'm making a hangman game, one of which I want to do is jlabel text, which uses ex. "__" Update, depending on the word…… -
Java – HashMap maps integer arrays by considering their values
Given the following code, I get a null (what I want is "1234") But I hope there is a mapping that can treat the key as…… -
java – Runnable. When can tostring() return duplicate strings?
this. When might tostring() return a duplicate string? public static void main(java.lang.String s[]) { for(int i=0…… -
Java – how to reference a wicket page with parameters
I need to send wicket links (e.g. by email) to reference instances in the system For example, a message might contain:…… -
Java – find the highest n numbers in an infinite list
I was asked this question in a recent Java interview The following is what I have done. If someone can provide a more …… -
Java – how to make Android media player play sound?
I don't know why it doesn't work. There are no recording errors in logcat, but I can't hear the sound public static vo…… -
PowerShell: replacing strings with hash tables
OK, so I set up a hash table whose name is to be replaced and the key is to be replaced, as shown below: $r = @{ "…… -
Java – how to write a method that accepts int variables and returns the maximum value?
I'm trying to write a method to compare three numbers and return the largest number This is my code, but it doesn't wo…… -
Drag and drop – JavaFX: changes the cursor during drag and drop
I want to change the cursor on my node during drag and drop, but the image does not change I call setCursor () in the …… -
Java – mouselistener / keylistener does not work (JPanel)
I'm working on a small project involving the mouse and key listeners in JPanel Unfortunately, when I use the mouse / k…… -
Java – set the size to TreeSet
Is there any way to provide size limits for treesets in Java collections, just as we do for arrays? anArray = new int[…… -
Another Java generic “incompatible type” compilation error
I was writing some code and encountered incompatible type compilation errors public interface Expression<T> { …… -
Java – BigDecimal number format
BigDecimal val = BigDecimal.valueOf(0.20); BigDecimal val = BigDecimal.valueOf(0.20); System.out.println(a); I want to…… -
Java – http / 1.1 400 error request on httpget with basic authentication
I made an application for httpget My application uses its own certificate, so the server requires user login For certi…… -
Java – how do I rename a file to another file system?
I encountered a strange problem when using renameto() I don't know why I can't rename it / MNT / desttest, but I can r…… -
Java – what is operator overloading, which is different from polymorphism?
I program in Java and have been trying to understand exactly what operator overloading is I'm still a little confused …… -
Java – finds the second smallest integer in the array
In our assignment, we need to recursively find the second smallest integer in an array However, in order to better und…… -
Java – change the application name in Android studio
This guy is a problem with Android studio I make a startup screen in manifest, and then I run the application in the s…… -
Java – how to use JSON simple to parse from JSON to map and preserve the key order
I'm using JSON simple and JSON simple lib to write configuration files, but I'm having trouble converting JSON strings…… -
Using parameterized (generic) Java classes and normal classes
If I need to write a class that handles' comparable 'data, I can do it in two ways: 1) public class MyClass<T exten…… -
Jsoup – search for elements by attribute value
So I'm not sure if this is feasible But I want to scan the XML document to find all elements with specific attribute v…… -
Java robot class – add focus to a specific running application?
I just want to find out if / how to let the Java robot class change the focus from a running Java application to a spe…… -
Java – the difference between declaring ArrayList under polymorphic and normal conditions?
What is the difference between declaring an ArrayList in such a polymorphism: List<Integer> iL = new ArrayList&l…… -
Java tags? Outer, middle, inner
Please don't worry about loops, but my question is about those keywords: external, intermediate and internal They are …… -
Java – iterative execution command list – which mode?
I wrote a java program that reads a file containing the commands to be executed (in my own language) Command is read a…… -
Java attempts to mutate in notifications
I have two tables and a module they all look at Basic – they should all update the module and update from it Is there …… -
Java – HTTP status – no resource exception found in 404 JSP
See English answers > JSP in / WEB-INF returns "HTTP status 404 the requested resource is not available" Index jsp……