包含标签：Java 的文章
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Java – preconditions library throws illegalargumentexception for notnull check
Do you know that Apache commons validate or guava preconditions is a good alternative. When checking whether the objec…… -
Java EE – how to instantiate multiple CDI / weld beans for a class?
In spring, you can instantiate any class by defining the corresponding bean in XML conf You can also instantiate multi…… -
Java – create a runnable jar that contains external files
I want to build a running jar. Jar in Java I need to include some files in the jar so that when I execute the jar, the…… -
Java commons cli with options for a list of possible values
Xinxin banner Xinxin 200 new 200 new 200 new 200 new 200 new 200 new 200 new 200 new 200 new 200 new 200 new 200 new 2…… -
What time do you use the Callable object to call call () in Java Executor?
Here are some sample code for example What I need to know is when calling call () on calllable? What triggered it? pub…… -
Java – separate Classpaths for test code and main code
I have two source code trees in my eclipse Java application One is "SRC" and the other is "test" Each contains Directo…… -
Java – should private instance variables be accessed in constructors through getter and setter methods?
I know that private instance variables are accessed through their public getter and setter methods But when I generate…… -
Java generics and collections reading reference
Although I know some working knowledge of generics and collections, I can also say that I have some experience in usin…… -
Java – when to use hibernate connection. provider_ class
When should I use hibernate connection. provider_ class？ Me and 'hibernate connection. diver_ There is a bit of confu…… -
Java-8 – delete the “05:30” section from java8 localdatetime to xmlregistry calender
As shown below, LocalDateTime currentUTCTime = LocalDateTime.Now(ZoneId.of("UTC")); String reqPattern = currentUTCTime…… -
Java – how to run methods asynchronously using spring?
The following code assumes asynchronous work, but waits for the async part to complete and then continues How do I mak…… -
Java – cannot instantiate a type in a generic
I have this course public class Tree<T> { //List of branches for this tree private List<Tree<? su…… -
Java – is there an SQL syntax aware swing component?
I'm looking for some Java Swing components (like textarea) that know SQL syntax - which means it can recognize and hig…… -
How to create a linked list array in Java?
So I need to input the edges of a bipartite graph like this: 6 1 3 1 2 1 5 2 7 2 4 2 9 The first number is the number …… -
Java – parsing XML from httppost response
During HTTP post, I store the response as a string response HttpResponse httpresponse = httpclient.execute(httppost); …… -
Java – using messagepack with Android
Has anyone tried to use @ l_ 502_ 0 @ app using messagepack? Caused by: java.lang.ExceptionInInitializerError at org…… -
Java Gregorian calendar time zone
I have a strange question about Java Gregorian calendar: SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm…… -
How to find out which thread locks the file in Java?
I'm trying to delete a file previously used by another thread in my program I can't delete the file, but I don't know …… -
The target version of java compiler “jsr14” and JDK7 / 8
Who can tell me that javac with jsr14 target option can still use JDK7 / 8? Say, $javac -source 1.5 -target jsr14 Hell…… -
Java – accessing private fields of another object in the copy constructor – is that really a problem?
In my java application, I have some such copy constructors public MyClass(MyClass src) { this.field1 = src.field1;…… -
Java – missing preview tab in birt layout
A new version of birt 4.0 has just been installed in eclipse x. The preview tab was not found in the layout window Sol…… -
Fast and constant get () mapping with Java 7
When using the HashMap provided by Java 7, I encountered a problem, that is, get() evolved from O (1) to o (n), as des…… -
Java – what makes HashMap Putifabsent is faster than containskey?
topic How can the HashMap method putifabsent conditionally execute put faster than before calling containskey (x)? For…… -
Java – anonymous variable (?) Advantages?
I want to know something suddenly came to my mind yesterday We can do this (in Java): ObjA instanceA = new ObjA(); Obj…… -
Java – use beans to send mail from JSF pages
I am using JSF and primefaces to create a web application. My problem is how to send e-mail through the contact form o…… -
JavaFX 8 datepicker function
I just started using the new JavaFX 8 control datepicker In datepicker user experience documentation, it claims that i…… -
How do you use CouchDB change notifications to make continuous changes from Java?
I'm trying to use CouchDB (continuous) change API in Java and find that after exhausting the current change list, the …… -
Java – how do I manage optional spaces in ANTLR?
I tried to parse the data file in ANTLR – it has optional spaces 3 6 97 12 15 18 The start and end positions of t…… -
How do I inform users that a specific tab in jtabbedpane needs attention?
Suppose you have a user interface with five or more tabs and you need to notify the user that tab "2" needs attention …… -
Java – change date format
If the input is 01-01-2015, it should be changed to 2015-01-01 //Class to change date dd-MM-yyyy to yyyy-MM-dd and vic…… -
How to protect methods in Java (overflow, etc.)
I have to write a "watchdog" in Java to ensure that threads do not take long to execute There is no problem with objec…… -
Java – I can have the ArrayList string in the realm object Android
Since we don't have any list data types in the domain, how can we use ArrayList < string > to create objects in ……