包含标签：Java 的文章
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Java – make Jfilechooser display image thumbnail
I want to create a Jfilechooser with a thumbnail view of the image file So I subclass fileview and zoom in the method …… -
What is the reason for this strange Java behavior?
I want to test the '= =' operator on long. This is what I found: the following code: public static void main(final Str…… -
Java – how to set the direction of jtextarea from right to left (in joptionpane)
I have JScrollPane and jtextarea. I try to set the direction of jtextarea from right to left, so the text will start f…… -
Manage java version compatibility
I read "jdks are generally forward compatible, and jres are generally backward compatible" What version checks do java…… -
Java – redirect timeout after httpsession
I've been reading many posts on this topic, but I can't get a solution for my example I am using Java EE 6 and JSF 2.0…… -
Java instanceof and class name
I just asked this curiously. Maybe it's meaningless When we use instanceof in Java, for example: if (a instanceof Pare…… -
Java – how do I access static members in a velocity template?
I don't know if there is a way to do this in velocity: I have a user POJO, an attribute called status. It looks like a…… -
What is the main difference between the optional Scala option of Java 8 and Haskell’s may?
I've read several articles about the upcoming optional types in Java 8, and I want to know why people keep suggesting …… -
Java – is entitymanager really thread safe?
I'm talking about the basic usage here: @Stateless public class BookServiceBean implements BookService { @Persistenc…… -
Java – under what conditions do we need to use composite keys in the database
I've seen that we can use compound keys, where the primary key consists of a combined primary key of two tables Like p…… -
Java – unable to resolve HttpServletRequest
I have imported the following I want to get the preferred language browser HttpServletRequest request = ServletActionC…… -
How do I convert year and week to Java date objects?
How do I convert year and week to Java date objects? I'm using jodatime, but it's also good to use the standard Java c…… -
Java – singleton using atomicreference
Is the deferred initialization singleton correctly implemented using atomicreference? If not – what are the possible p…… -
How to use Java stream to collect multiple lists into one list?
There is already an answer to this question: > java8 lambda: concat LIST1 List<MyListService> services; serv…… -
Java – what’s the big difference between using include or loop through lists?
Performance wise, there is really a big difference between use: > ArrayList. contains(o)vs foreach | iterator > …… -
Tuning GC for Java audio applications
I noticed that when playing audio in Java, the marksweepcompact phase in GC is too long and leads to short silence, wh…… -
Java – @ formdataparam not found in Jersey 2.17
I'm new to web services, so I've started the basic examples This one involves file upload I am using the latest (2.17)…… -
Java – passing methods as parameters – is this possible?
I tried to migrate to Java 8 and have some methods in my Dao class to do the following @Override @SuppressWarnings("un…… -
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…… -
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 – why do we have to use an intermediate variable (“unchecked”) for @ suppresswarnings?
Good afternoon, everyone, I wonder why public class test<T> { T[] backing_array; public void a(int init…… -
Java lambda expressions and logging
I'm reading the new features of log4j2, and there is a feature that can be enabled "Java 8 lambda supports lazy loggin…… -
Which Java RMI / RPC / IPC technology should I use?
I am developing a Java application that contains a server and a client (there may be multiple clients in the future) t…… -
. 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 – 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…… -
The mockbean annotation in the Java – spring boot test results in a nonuniquebeandefinitionexception
I have a problem using @ mockbean annotation The document says that mockbean can replace beans in the context, but I g…… -
“Error: java_home is not defined correctly.” Building jikes RVM
When I built jikes RVM on Ubuntu, I received this error Any ideas? bin/buildit localhost production ---> Config: pr…… -
How to kill these code blocks in Java?
caller: switch (type){ case "creature": Creature returnActor2 = getNextCreature(); …… -
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 – 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 …… -
Java – the queue is completely wrong. Cooperate with multiple consumers and producers
I want to simulate the following scenario: multiple users and producer threads are modifying some data establish Block…… -
Java – where are the private instance variables of the abstract class created in the heap?
abstract class A { abstract class A { private int a; public A(int x) { a = x; } public int get……