包含标签：Java 的文章
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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 – how to split without regular expressions
In my java application, I need to use the same "target" to find the index and split the string in both cases The goal …… -
How to use Java’s org w3c. dom. Get text from node_ TagName for node
In the interface's documentation, it declares that text nodes return "#text" as their name instead of the actual tag n…… -
Java gets the first two decimal digits of a double
I have a huge double, and I want to get the first two decimal numbers as floating point numbers Here is an example: do…… -
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…… -
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…… -
Layout – how do I get the buttons to populate the JavaFX gridpane?
Java swing has a GridLayout that allows you to specify the size of an array of widgets, such as 3x4 The widgets then p…… -
Java – add filters to Project Explorer in eclipse
I want to add a new filter in Project Explorer to hide it from users in @ L_ 301_ 0 @ some projects automatically crea…… -
Java – JSTL for each in JSF 2
Hi, I got the following code: <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTM…… -
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…… -
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 – improved main screen algorithm
I'm trying to make a good java program to generate prime numbers from 1 to n (mainly for project Euler problems) At pr…… -
Java – how do I get host names based on IP addresses?
I want to find the host name based on the IP address given in the program Solution Yes, it may import java.net.*; publ…… -
Java – given a list of IP addresses, how do you find min, max?
In Java, I have an ArrayList of IP addresses How do I find the minimum and maximum values? I have used collection Min …… -
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 – 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…… -
Java – null is a good way to check a long list of parameters
Suppose that all parameters of the same type for some methods are long I have similar operations on each parameter (if…… -
Maximum limit for Java arrays
I tried to create a 2D array in Java, as follows: int[][] adjecancy = new int[96295][96295]; But it failed with the fo…… -
Java – do you have to know the machine architecture for writing code?
Suppose I use Java or Python or C programming to solve a simple problem, which may be to build a TCP / UDP loopback se…… -
When to use flush () in Java?
import java.io. * ; import java.io. * ; public class Ser { public static void main(String args[]) { try …… -
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…… -
Generate Java dump when OUTOFMEMORY
I have a program that should eventually generate OUTOFMEMORY public class VeryLargeObject implements Serializable { …… -
Java – lwjgl cannot find the display class
I have installed lwjgl into the Java project. I can't import the display class import org.lwjgl.opengl.display; An uns…… -
What are some prominent real-world applications of Java?
I am a beginner programmer. The I & CS course in our school let us start learning Java In my opinion, C and its se…… -
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…… -
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…… -
Java – mockito throws an outofmemoryerror in a simple test
I try to use mockito to simulate the database pool (only for retrieving data), but it will run out of memory when runn…… -
Java – double check locking using regular HashMap
Back to concurrency So far, it's clear that for double check locking, variables need to be declared volatile However, …… -
Java – how to prevent hibernate from refreshing in the list?
I have a simple hibernate query, such as: from MyEntity where name = ? It's not fancy, but it's called many times in a…… -
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…… -
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…… -
Java gets the file extension without substring
How to get a file extension in Java without using stupid lastIndexOf ('.') and so on? Solution The Apache commons libr……