Recent Posts
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Inconsistent Java performance
I have an interpreter written in Java I tried to test the performance results of various optimizations in the interpre…… -
Java – check Batis mapper bean error
There are spring and mybatis network projects I use IntelliJ idea for development Review comments: Could not autowire.…… -
Java dot does not match “any character”
The dot should match any character So why doesn't this regular expression work? String url = "http://wikipedia.org"; S…… -
java – JMH puzzle：StringBuilder vs StringBand
It's hard for me to understand the progress of this benchmark I want to measure how my sample class stringband works c…… -
Java – how do I set the resource ID for a token?
I try to use this guide to implement restful web services of oaof: https://spring.io/guides/tutorials/bookmarks I can …… -
Exception in hexadecimal to int number format in Java
I encountered a number format exception while trying to do this int temp = Integer.parseInt("C050005C",16); If I reduc…… -
Java – how to detect the last character
I have a string. I want to know what the last character in my string is# String test="test my String #"; Solution Only…… -
Java – use system out. Println() creates a border
Anyway, has this arrangement been created, and no string variable SH3 affects the boundary? I'm really sorry that my k…… -
How to check whether the variable name contains a string, and then output the string variable content
So I have these four variables private final String PROG_DEPT = "PROGRAMMING/ENGINEERING"; private final String DES_DE…… -
Java – is there any reason to always use objects instead of primitives?
So I just started to write the second programming class in Java. This is an example that the professor showed us loops…… -
Is this statement correct in Java?
I want to use datagram socket to transfer data between two computers I use the following lines: host=InetAddress.getBy…… -
Sorting array lists in Java
I have finished class Here, iris is another class with certain properties public class Helper { Iris iris; do…… -
Java – how do I send messages from my android app to specific contacts via WhatsApp?
I'm developing an android app. I need to send messages to specific contacts of WhatsApp Uri mUri = Uri.parse("smsto:+9…… -
For loops run forever in Java [copy]
See English answer > what is X after "x = x + +"? 17 @H_ 419_ 9@ @H_ 419_ 9@ public static void main(String[] args…… -
Java – draw a point on the JPanel
Is there any way to use Java awt. The graphics class draws a point on JPanel? I can't find any such way There are many…… -
Check the existence of Java in the file
I want to create a text file, but if the file already exists, I should not create a new file, but attach the text to t…… -
Java string Split() deletes trailing empty entries
I'm trying to parse some pipe delimited records I have this Code: public class Test { public static void main(Stri…… -
Repetitive sequences in Java / Python / Mathematica
How to write the following statements in a given language? a(0) = 1 a_(n+1) = 1 - 1 / ( a_n + 3) When a_ When n – >…… -
Java – a space saving data structure used to store and find a large number of (evenly distributed) integers
I need to find and find a million evenly distributed integers in memory Background: the above integer problem is a sim…… -
Java – can you request multiple types at once?
Basically, I want to do this: public interface A { void a(); } public interface B { void b(); } public class S…… -
Does the java compiler pre calculate the sum of text?
int i = 10 + 20; int i = 10 + 20; Is it true that the compiler will process this code, add 10 and 20 bytes, and the co…… -
Java – syntax error: Insert ‘}’ to complete the block
My code keeps going wrong I'm making an application to generate quotes Who can help me with this? Whatever I try, I ge…… -
Using threads in swing GUI in Java
I use the following code to replace a jlabel every 0.5 seconds, using the same sentence, but using another point Runna…… -
Java inheritance problem
Suppose I extend a class and override the methods in that class What is wrong with calling rewriting from my new class…… -
How do I access memory locations in Java?
Can we access memory locations in Java directly or indirectly? If we try to print the object, it will print the hash c…… -
Java – why mockito returns_ Default does not return the default string?
In the following example (mockito 1.10.19): MyClass myClass = Mockito.mock(MyClass .class,RETURNS_DEFAULTS); Strin…… -
Java of jar file
I created a Java application and packaged it into a jar file on the windows platform Now I want to deploy the jar file…… -
Java – what is the purpose of the access modifier
Do you need access modifiers in your programming language? Solution See: encapsulation (Wikipedia) Of course, you can …… -
After uninstalling Java and reinstalling it to a new location, eclipse will not start
I reinstalled the JDK tonight because there is embedded space in the program file... Now eclipse will explode immediat…… -
Java – how to add a second table to the database in SQLite?
I have a database exam guide. I have created a table_ Subject and now private static final String DATABASE_CREATE = "c…… -
What does a java thread do after running?
In a game, I'm using many instances of a thread, and it won't track them clientThread cT = new clientThread(socket); n…… -
Java – reverse loop for array countdown
I received an error Exception in thread "main" java.lang.Arrayindexoutofboundsexception: 10 at Reverse.main(Revers……