Java
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Java – why mine Jar files run slower than programs in eclipse?
I have a java program that reads a large amount of input data from the database, operates on it, and then writes the d…… -
Java – use Hadoop to process a large number of small files
I am using the Hadoop sample program wordcount to handle a large number of small files / Web pages (CCA. 2-3 KB) Since…… -
. Net – using dapper ORM to improve the performance of SQLite batch insert
I'm using a desktop application that uses SQLite to batch insert tens of thousands of rows into the SQLite database I …… -
Java – with mockito Strange generic edge cases inferred by when () and generic types
I'm writing a Java. Net using mockito beans. For the test case of propertydescriptor, I want to laugh at the behavior …… -
Java – Preparedstatement cache – what does it mean (how does it work)
I'm using, for example, c3p0 and some defined "maxstatements" for preparestatement caching Now I send a prepared decla…… -
Java – Dynamic parsing logic operation – and, or, loop condition
I have an incoming record filter stored with logical clauses, as shown below Acct1 = 'Y' AND Acct2 = 'N' AND Acct3 = '…… -
java – String … whats do String … mean
I want to figure out some java code private static object [] methodName(NodeList nodes,String... Names) What is an ope…… -
Java – how do I close a socket in the right way?
This is a simple TCP server How to close the socket when the program terminates? Anyone can figure out how to close a …… -
Why is the result type of short integer division in Java not a simple integer?
Consider this Code: public class ShortDivision { public static void main(String[] args) { short i = 2; …… -
Non blocking socket writing in Java is compared with blocking socket writing
Why does someone prefer to block writes and non blocking writes? My understanding is that if you want to ensure that t…… -
Java – after calling set text, jlabel draws new text over the old text
I have a progress dialog window, which contains three jcomponents: jlabel, jpprogressbar and JButton. It is used as th…… -
How to use JPA to enumerate the where clause in jpql?
I have an enumeration as an attribute of an entity When I try to use enumeration in jpql suqry, I give an error In add…… -
How to write windows software in Java?
I just studied Java in college However, I can only write programs that run on the command line How to use java to crea…… -
Java – how do I name repositories and service interfaces?
How do I name the repository and service interfaces and their implementation classes? For example, I have a model call…… -
How to work in Net application to identify possible memory optimizations?
We have one Net application, our customers think it is too large-scale deployment. We want to know what will help our …… -
Java – BufferedReader does not read all lines in the file
I tried to read / proc / net / XT in Android 6_ qtaguid / stats. 2 a0 0 0 123456 311 48329 737 48 1 3 b0 0 0 0 0 0 0 0…… -
Java mimetypes filetypemap always returns the application / octet stream on the Android simulator
I'm trying to determine the mime / media type stored on the Android device (actually a virtual device used with the em…… -
Java – I was studying robolectric, but something went wrong
I'm learning robolectric My project directory is, My unit test code mainactivitytest is as follows, package com.exampl…… -
Java – what is the optimal initial capacity of a StringBuffer for input with a very variable length?
Good afternoon, everyone. I use Java Lang. StringBuilder to store some roles I don't know how many roles I want to sto…… -
Java – jax-ws client: maintaining sessions / cookies in multiple services
I use NetBeans to automatically create web service clients from WSDL files This is good, except that the web services …… -
JPA cascading persistent error
I have a one - to - many relationship: product category can contain many products This is the code: @Entity public cla…… -
Java Optimization: (hotspot / Dalvik) optimize the return constant of the final method?
Anyone can tell me whether hotspot or Dalvik is smart enough to inline call the final method that returns the constant…… -
Java – HTML 4 in JSF 2.1
I want to use the command: JSF < H: CommandButton > generate < input... > But I hope instead of generating…… -
Java case insensitive regular expression matching does not match the letter Ñ
Consider this procedure: import java.util.regex.Pattern; public class xx { /* * Ñ * LATIN CAPITAL LET…… -
Java – unable to start active resource $notfoundexception
I have published and run an application on Google play for several months Today, I received an error from a user whose…… -
Java – how to add a text area on joptionpane
At present, I have a joptionpane When I click the button, I am executing the following line JOptionPane.showInputDialo…… -
Java garbage collector and memory issues
I have a very strange problem with Java applications In essence, it is a web page using Mulan (CMS system). There are …… -
Java – how to upload to S3 through pause / resume support?
I want to know how to upload files to Amazon S3 through pause and resume support? (via web browser) Is there a sample …… -
Java – what if you only reference objects from garbage?
Suppose there is an object a of class A, which holds a reference to another object B of class B This is the only refer…… -
Java – set up multi-directional – Android
I am a novice in Android programming. I have a problem with direction I hope my activities can only be viewed in portr…… -
Processing objects according to the implementation of interfaces in Java
I have been looking for design ideas to solve this problem in Java I'm using a library (I can't change it). For this e…… -
Java – a fast algorithm for inverting ARGB color values to ABGR?
I am using intbuffer to operate the pixels of bitmap, but the value in the buffer should be aabbggrr and the color con……