Java
-
Java – convert data URL to bufferedimage
I have a data URL for an image file and must pass it to another function Along the path from the data URL to the buffe…… -
Java UTF-8 to ASCII conversion and supplement
We accept the input of various national characters in UTF-8 string, and we need to convert them into output ascii stri…… -
JAVA_ Home cannot find sudo
I have a bash script on a Linux box that runs jar files When I log in as a regular user, I do not have permission to r…… -
java. util. stream. What happened to streamable?
Early jdk8-ea JavaDocs like this indicated that there was a Java util. stream. Streamable interface, which seems to ha…… -
Multithreading – use TDD to drive thread safe code
What is a good way to use TDD to launch thread safe code? For example, suppose I have a factory method that uses defer…… -
Java – use characters instead of strings for single character values in StringBuffer append
I am passing the PMD rule appendcharacterwithchar It says avoid in StringBuffer Append concatenates characters into st…… -
Java – how to automatically split large strings in IntelliJ ideas?
I'm testing with a long string So I need to split such a large string: privat static final String TOO_LONG_JSON = "{fi…… -
Java – fastest way to check string size
I have the following code in the loop statement if (sb.toString().getBytes("UTF-8").length >= 5242880) { // Do …… -
The right way to use varhandle in Java 9?
I spent a lot of time investigating some new features of Java 9, but I didn't find any useful and practical examples C…… -
Java swing – running on EDT
I have a few questions about swing and use EDT to update the GUI I've just started reading this, so I'm a new beginner…… -
MediaPlayer. Java. In the displaying () method lang.IllegalStateException
public static MediaPlayer mp=null; public static MediaPlayer mp=null; public static void playGeneric(int name,final Im…… -
Java EE – compare openejb with GlassFish
Can we replace GlassFish with Tomcat / openejb for lighter applications? What are the limitations of openejb instead o…… -
Java – Reference “this” when calling the super constructor?
I have a Class A and write a subclass B. only one constructor is parameterized B must call this super constructor of A…… -
Java – nested bounded wildcards
When I try to compile the following code: LinkedList<List<? extends Number>> numList = new LinkedList<L…… -
Java – random and uniform distribution
I know that if I use the random generator in Java and generate numbers with nextint, the numbers will be evenly distri…… -
Datetime – dome minutes using java 8
So I was lucky to use Java 8 and the new time API, but I didn't see any rounding function Basically, if the time is 20…… -
Nesting enumerations in Java
I want to nest some enumerations The object I represent is flags, with type and value There are discrete types, each w…… -
Cassandra Java driver: how many touchpoints are reasonable?
In Java, I connect to the cussandra cluster as follows: Cluster cluster = Cluster.builder().addContactPoints("host-001…… -
Java – hibernate noob fetch join problem
I have two classes test2 and test3 Test2 has a property test3, which is an instance of test3 In other words, I have a …… -
Java – sipdroid – another incoming call is not displayed, while another continues
I have installed sipdroid I made three accounts in sip2sip The question is: if I use SIP to call the same phone multip…… -
Java – how to create a specific date in HSQLDB?
I need to create a high date in HSQLDB. The solution does not include me I need something similar Date(9999-12-31 0:0:…… -
Java – how to speed up the build process using Maven tools
I use Maven as a build tool At present, I am doing the following construction Right click on the project - >maven c…… -
Java NIO Files. Createfile() failed with nosuchfileexception
I tried to put some core files in the dev - Test - prod setup Basically, if the document is newer, it needs to be copi…… -
Java – use generics in parameters of exceptions
I'm trying to store a collection of generic objects in exceptions and have trouble figuring out generics Specifically,…… -
Java – access jar resources
I have a jar file and resources (mainly configuration cache, log, etc.) that I want to distribute I have a problem wit…… -
RSA encryption in Java: cross platform issues?
situation I am using RSA encryption in Java I am loading the data on HTC saphire (32b) developer's mobile phone with A…… -
Use “this” and method (in Java)
What about using the "this" method in Java? Are there selective or mandatory situations? The only thing I encountered …… -
Java – notificationlistenerservice: NullPointerException on getactivenotifications
According to this tutorial, I try to implement notificationlistenerservice in my application: http://www.kpbird.com/20…… -
java 7 uuid bug？
I believe I may have found a UUID multithreading error in Oracle java7 update 5. I wonder if anyone can confirm it wit…… -
Java – vector graphics in IText pdf
We use iText to generate PDF from Java (based in part on the suggestions on this website) However, embedding an image …… -
Java – what is the difference between length and length?
See English answer > length and length () in java7 arrayone.length; However, for things like array lists or strings…… -
Java – spring security and LDAP authentication
I'm trying to set up LDAP authentication. This is my spring security XML file: <?xml version="1.0" encoding="UTF-8"……