Recent Posts
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Java – regular expression patterns match all uppercase letters after colons
I need a pattern that matches words like apple: or pear: [A-Z] [:] will match R: but not the whole word, so it will gi…… -
Swing – why does eventlistenerlist traverse backwards in firefooxxx()?
I don't understand the basic principle of this code, which is taken from javax swing. event. Eventlistenerlist documen…… -
Why is the runtime exception “unchecked” in Java?
Why are runtime exceptions unchecked meaningful (not if they are checked)? Solution If you do not, you must use the tr…… -
Java – unable to connect to SQL Server database using JDBC
I am trying to connect to an existing database in SQL Server 2012n using NetBeans 8 Using the connection wizard, I sel…… -
Is there a ‘checked’ keyword equivalent to c# in Java?
Yes, this is a very simple piece of code, but I still want to know if there is a built-in alternative This is the code…… -
Java – order of static initialization blocks
I found a lot of posts on the static initialization block, but I tried to better understand the execution order and wh…… -
I shouldn’t do ` string s = new string (“a new string”)` In Java, even automatic string practice?
Well, this problem is an extension of this problem Java Strings: “String s = new String(“silly”);” The above question …… -
Java – spring rest security – protects different URLs in different ways
I use the rest API for basic authentication under spring 4 These rest services are located under / API / V1 / * * URL …… -
Java – how to make good GUI design in swing
Hello stackoverflow family I developed a Java Swing application, but I want to improve the design of my swing framewor…… -
java – SimpleDateFormat. Parse () – generates incorrect dates for different date formats
Here is my code for parsing dates using the simpledateformat pattern: String pattern = "yyyy-MM-dd"; SimpleDateFor…… -
Why is the scope of switch statements in Java unlimited?
Why in Java, the scope of variables is limited to switch blocks rather than case blocks For example, // Scope limited …… -
Java – JIT optimization and weak references
I have the following code: private final List<WeakReference<T>> slaves; public void updateOrdering() { …… -
Can I write variable names with hyphens in Java?
I use gson in my application I have the following JSON responses: { "success":true,"person-name": "John" } So I'm cr…… -
How to read comma separated values from text files in Java?
I have this text file, which contains the latitude and longitude values of different points on the map How do I divide…… -
Java – how to delete objects from the stream in the foreach method?
I have to use arrays: arra and ARRB Arra and ARRB are lists of different types of objects. The add function converts o…… -
Java – when I need to escape an HTML string?
In my legacy project, I can see that escape html is used before sending strings to the browser StringEscapeUtils.escap…… -
Java swing – JList custom cell rendering – capture operation
Whenever I create a custom cell renderer for JList, any elements I add to it will not respond to the operation For exa…… -
Is there a correct way to check the existence of files / directories in Java?
Code: String dir = //Path to the directory File saveDir = new File(dir); //Here comes the existence check if(!saveDir…… -
When to use flush () in Java?
import java.io. * ; import java.io. * ; public class Ser { public static void main(String args[]) { try …… -
Java – conditionally skip TestNG tests
I don't have much experience with TestNG annotations, but I'm trying to build a test suite using the TestNG framework …… -
Java – what features does EJB3 bring and how does EJB3 integrate with the spring framework?
I have never been involved in EJB work. When I started programming spring, it was already here. All my projects only u…… -
java – kryo. ReadObject causes NullPointerException with ArrayList
When I use kryo to deserialize the ArrayList object, I get a NullPointerException Caused by: java.lang.NullPointerExce…… -
Does every program in Java need a class?
Is this always the case? Solution Yes, you need at least one class to have a program, but no, you don't need any metho…… -
java – vert. How is x single threaded?
According to my understanding, every vert X instances will be assigned an event loop Event loops handle all requests a…… -
Java JTable does not display gridlines
I showed a JTable. In JPanel JTable is located in a scrolling window table.setShowGrid(true); Here is a picture: note …… -
Java: I have a large string of HTML and need to extract href = “…” text
I have this string that contains a chunk of HTML. I try to extract the link from the href = "..." part of the string H…… -
Java – how to read an integer separated by spaces into an array
There's a problem with my project because I can't get the correct start, reading integer rows separated by user spaces…… -
Java – mockito: how to test that a constructor is called?
I'm using mockito to test methods in Java applications How to test that the constructor is called once? I'm trying a s…… -
Java – print the inversion of any string without using any predefined functions?
How to print the reverse of string Java is an object-oriented language without using any predefined functions, such as…… -
Tricky Java programs
Look at the following code, please help me solve this problem class TestTrick{ public static void main(String arg…… -
Java – swing text editor, color and highlight
I am writing an application that users need to write a JavaScript script as input. Now I have a simple jtextarea, but …… -
Java: what is the difference between format specifiers% X and% H?
Looking at the specification page, I see that% h calls integer Tohexstring(), but I can't find any actual difference b……