Recent Posts
-
Java – Android – SQLite – select between date1 and date2
Mac OS-X Android Eclipse and ADT SQLite I'm new to creating Android apps. I've done a lot of research on it, but I hav…… -
Java – throw an exception or block it?
The question is whether it prefers to throw exceptions or prevent exceptions This is a game project The index out of b…… -
When Java calculates a conjunction (\ u0026 \ u0026), if Exp1 is false, does it Eval exp2?
I want to know whether to ensure that in Java programs, as long as the expression on the left (Exp1) evaluates to fals…… -
Can @ unique () be executed inside Java in xpages?
When I want a unique key for a file, I prefer @ unique() I like it based on user name and time Is there any way to get…… -
How to check whether ArrayList contains 2 values?
Is there a way to check whether a collection contains one or more values and has better performance than using the con…… -
Java: how to assign variables if the result is null?
This works: String address1 = HtmlUtil.escape(rs.getString("address1")); ... but I don't want to show "null" So I trie…… -
Invisible GUI? (Java)(Swing)
I'm studying this program, using swing Every time I export the program and run it, I try to set up the GUI JFrame can,…… -
Java – @ postconstruct is called multiple times for the @ conversationscoped bean
I have a @ conversationscoped bean with a start method, as follows: @postconstruct public void start() { if (conve…… -
You can overload the finalize () method in Java
I've read a method, and each method can be overloaded It's a method, of course But when searching, I also found that y…… -
Java – JBoss cannot handle more than 3000 requests
I created a client and server web service I thought about doing a performance test I tried a JMeter with a sample test…… -
Java – how to create an ordered set of objects based on specific fields?
I need to retrieve the sorted object list according to the sorting field; Their collection type is sortedset, but the …… -
Java – cq5 – sling CurrentPage in model class
In CQ JSP, just call CurrentPage Getpath () can easily access the CurrentPage object But I'm trying to delete any scri…… -
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…… -
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 – program execution and GUI
OK, so I'm designing a GUI Usually I have finished the GUI, which accepts a set of initial inputs and then triggers th…… -
Java – how to use math Random() gets the random number in the range
See English answer > math random,only generating a 0? 5 public class Tester{ public static void main(String arg…… -
Java – how to cascade and keep only new entities
I am not sure how to set JPA persistence correctly for the following entities (using eclipse link and transaction type…… -
Java – long press is not applicable to listview
I'm trying to set up a long press listener for listview: final ListView gallery=(ListView)findViewById(R.id.dialogView…… -
Java – how do I find all the first indexes in a string?
I use this source: String fulltext = "I would like to create a book reader have create,create "; String subtext = "c…… -
Java – cursorindexoutofboundexception: request index 1, size 1
This is me again. There is a SQLite problem with Android At present, I get a "cursor index out of boundary exception: …… -
Java – how to parse strings safely?
We know that using string join to form SQL query will make the program vulnerable to SQL injection attack I usually us…… -
Java EE – GlassFish: name of driver class missing data source
(scroll to the end to find possible errors related to this.) This connection pool seems to be correct, at least Ping i…… -
Java – what is the value of a week?
I want to use two long values, system Currenttimemillis() is compared with the pre - recorded long I want to see if it…… -
Java – returns a static HTML without redirection in spring
So I want to return to the HTML page without sending a redirect The reason is that the URL in the browser is changed b…… -
Java – error: unable to find or load the main class < < why do I receive this error?
I don't seem to be able to make this code work properly This is the mistake I keep getting: What caused this? Payroll3…… -
What string should I pass to Java lang.Long. Parselong() to return Nan?
Unfortunately, I can't use anything like long Nan, because the string is actually the return value from different C mo…… -
Java – which method in jsoup can return modified HTML?
When I use jsoup to parse HTML files (stored locally) I modified some elements in the HTML file, so I want to save the…… -
Java – org / codehaus / plexus / archiver / jar / jararchiver (unsupported major.minor version 49.0) – Maven build error
All in the afternoon, I received the above error while trying to build the project I'm sure this is related to the lat…… -
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 …… -
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…… -
Is the trimtosize() method of the Java array list redundant?
I don't think the trimtosize () method in Java's ArrayList is necessary My understanding is: Let's look at an integer …… -
Java – why a loop with a char because its index is infinite?
This cycle will continue indefinitely: char a = 100; for(a=100; a>=0;--a) System.out.println(a); Does this happ……