Recent Posts
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In R, the character vector is divided according to specific characters; Save the 3rd piece in the new vector
I have a 'AAA'_ 9999_ Data vector in the form of 1 ', in which the first part is alpha location code, the second part …… -
Java string matching problem
I face a very basic problem Sometimes small things can take a whole day:（ I try to match 2 strings, and if it matches…… -
Java – how to attach a byte [] to a list?
How to attach the element of byte [] to list < byte >? Solution With guava, you can use bytes like this asList(b…… -
Java [unchecked] unchecked case warning
Well, I've been looking around and doing a lot of Google searches, but I still can't find a way to avoid this warning …… -
Java – how to create CSV files using servlets?
I want to download the CSV file from the servlet Data from object [] obj = search getSearch(); I have a data object []…… -
Java – how many elements does ArrayList add when it resizes itself?
Java's ArrayList dynamically extends itself when needed How many elements will it add when the extension occurs? Does …… -
Initializes a Java object instance that contains an array of objects
The following code is correct: public Sample mOboeSamples[] = { new Sample(1,1),new Sample(1,2) }; public Sample mGuit…… -
Java – what type of encryption does 48 bit to 48 bit use?
I have a stack of 48 bit (6-byte) values and I need symmetric encryption These two requirements are: >The generated…… -
How to convert bytes in binary representation to ints in Java
I have a string [] with a byte value String[] s = {"110","101","100","11","10","1","0"}; Recycling s, I want to get th…… -
How to determine whether there are available threads in the thread pool in Java
I try to get the task queue from the database table as quickly as possible, while limiting the number of threads proce…… -
Java – use Spock JUnit test and gradle to build the system and output unit test results on the console
GNU Emacs 24.3.1 GNU Emacs 24.3.1 Gradle 1.12 spock-core.0.7 Hello, I am using gradle to build the system and Spock fr…… -
Array. In Java What is the internal code for length()?
What is stored in the 10th position of the array int[] array=new int[10]; Suppose we have values stored from array [0]…… -
How to use java to find data in small data sets?
We have to find some data according to three input data fields Search must be fast There are only about 20 possible se…… -
How to use java to find data in small data sets?
We have to find some data according to three input data fields Search must be fast There are only about 20 possible se…… -
Java – how to change the JFrame content to the corresponding click?
I am using java to develop a simple desktop application There is a menu bar. When the user clicks menu item 1, the con…… -
Java – swing: pass values back to the UI from a predetermined thread
I have a java system tray UI and need a scheduled database polling What is the best way to generate a new thread and n…… -
Java – displays a list of strings in Android
I started developing for Android yesterday, so I'm a complete novice I try to use listview, but I can't even see the v…… -
Java – JAXB unmarshalling error: expected element is < {} root >
I'm reusing existing objects generated elsewhere to ungroup XML data in the form of string types Object: /* 3: */ i…… -
wsgen vs java2wsdl
What is the difference between wsgen and Java2 WSDL tools? Solution The main purpose of wsgen in Jax - WS RI is to gen…… -
Detect pending Linux shutdown
Since I install pending updates for my Ubuntu server as soon as possible, I have to restart my Linux server frequently…… -
Java – if I increase the memory heap, it will increase GC time
My current application runs on a normal GC cycle with 2GB of memory I want to increase JVM memory to 4GB to improve ap…… -
Java – the declaration of variable name declares the type of value to be stored? A prank?
Therefore, I have this true / false question in my computer science class (we use Java): (the word "type" in the quest…… -
Huge string table in Java
I have a question about storing a large number of strings in application memory I need to load about 5 million lines f…… -
Java: how to use currenttimemillis() to obtain a long time and output it in X decimal places?
I have a representative system Long. Of currenttimemillis() Then I'll measure it later in the code I've subtracted two…… -
Java – decimal conversion error
I'm writing a program to convert octal numbers to decimals It compiles correctly and everything, but my conversion cod…… -
How to use pdfbox to digitally sign dynamically created PDF documents?
I'm sorry! I'm poor in Java Please correct me where I am wrong and improve where I am poor! I'm trying to use PDF@R_77…… -
Java regular expression matcher mismatch
My string: <a href="https://MYURL/browse/TEST-53">FOO.BAR</a></p> Code: Pattern pattern = Pattern.co…… -
java – file. Createnewfile() IOException “no such file or directory”
Although java coding has this problem: file Createnewfile() throws IOException "no such file or directory" Check out o…… -
How to make a JavaFX image clipping application
I'm building an application for my colleagues to crop images Solution You have too many questions to be answered on st…… -
Java – BigDecimal number format
BigDecimal val = BigDecimal.valueOf(0.20); BigDecimal val = BigDecimal.valueOf(0.20); System.out.println(a); I want to…… -
What is the “less than or equal to” operator in Java?
I am familiar with ActionScript programming. I often use "< =" (less than or equal to) or "> =" (greater than or…… -
Java – how do I know if my phone is charging
I need to know (through my app) whether the Android device is charging Any ideas? thank you Solution One thing I found……