包含标签：Java 的文章
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The performance of regular expressions in Java is compared with that of indexof
Please tell me how to match "" And period "." It is also more effective to use indexof () instead of regular expressio…… -
What does the Java – cvhaardetectobjects () method do?
Some experts can explain whether I can use the cvhaardetectobjects () method to detect the box and obtain the width an…… -
Java: text strings
class A { class A { String s4 = "abc"; static public void main(String[]args ) { String s1 = "abc"; …… -
Why is tomee Java ee6 certified but not tomee?
As the title says I know very little about the internal working principle of Java ee6 certification However, it seems …… -
How to send int through UDP in Java
I'm trying to write some code to send a single int through UDP My code so far: From: int num = 2; DatagramSocket sock…… -
Java – set the location of Jfilechooser
How do we set the location of the Jfilechooser window? I tried the setlocation () and setbounds () methods, but it did…… -
Java – sqlexception: Protocol conflict in Oracle
I received a "breach of agreement" Oracle version used: jdbc driver used by Oracle 11g R2 (11.2.0.3.0): 12.1 Java used…… -
java – joda. time. Datetime deserialization error
I tried to deserialize a class with datetime as attibute: import org.joda.time.DateTime; import com.fasterxml.jackson.…… -
java – StringBuilder vs. . Concat vs. “is the relative performance of operators in eclipse different from the command line?
I'm reading about how, where possible, the java compiler will compile strings connected with the '' operator to an ins…… -
Java – should the mandatory utility class be final and private constructors?
By creating private constructors, we can avoid instantiating classes from anywhere outside By making the class final, …… -
Generics – lambda and anonymous classes
I have the following code: eventBus.subscribe(new EventBusListener<NavigationEvent>() { @Override public…… -
How to capture Ctrl mousewheel events using inputmap
I have implemented some hotkeys for swing applications that use inputmap getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW…… -
Java – add / modify suggestoracle after building suggestbox in GWT
I can do it for you Suggest@R_804_2419 @All the information found by and multiwordsuggest Oracle shows that the only w…… -
Jbpm6 service task execution java code
I'm new to jbpm6 My scenario is like this. I want to use jBPM service task to execute some java code From the document…… -
How to use the world wind Java SDK offline
I'm trying to use world wind. It's very good and easy to edit But in my case, the application needs to run offline So …… -
Java does not have information about all IANA time zones
I'm trying to map the value from the front end to the zoneid class, as follows: Optional.ofNullable(timeZone).map(Zone…… -
Java – add elements to 2D ArrayList
I know that for arrays, you can add an element to a two-dimensional array as follows: array[0][1] = 17; //just an exam…… -
Displaying opencv mat using JavaFX
I want to display the mat object in opencv directly with JavaFX I've seen that the mat object can be converted to buff…… -
Java – spring @ Autowired field – which access modifier, private or package private?
Suppose we use @ Autowired annotation on each field in the class, and we can set the setter or constructor of the fiel…… -
Java – how to read the heap dump file created by jconsole?
I call com. through jconsole. sun. management. Dumpheap operation of hotspotdiagnostic mxbean to manually perform heap…… -
Java – why use volatile members to generate JPA2 metamodels?
I just used org apache. openjpa. persistence. Meta. Annotation processor 6 generates a Metamodel for my JPA2 entity @j…… -
JUnit – missing branch when using asserttrue instead of assertNull
In Java / JUnit, I need to test null with some objects There are many ways to test a condition, but I've been using as…… -
Java – in eclipse, can you find all methods that take a certain parameter type in the project?
So this is basically my problem I convert all methods ArrayLists to hashmaps in the parameterized method, but I don't …… -
Java comparator: violation of general contracting
So I have this comparator: import java.util.Comparator; public class SolutionComparator implements Comparator<Expr…… -
Java Preparedstatement and on duplicate key update: how do I know if a row has been inserted or updated?
With the following code, how do I know whether the execute () method causes insertion or update?: Connection c = Drive…… -
Java – errors in eclipse are unprovoked
I'm building an Android application I was working on my application today and suddenly I saw all the items in the work…… -
Java – how does the behavior differ between these two synchronous usages in the list?
List<String> list = new ArrayList<String>(); List<String> list = new ArrayList<String>(); list…… -
Java – how to call onCreateOptionsMenu from code
I want to call onCreateOptionsMenu from my code, because if I use: menu.setGroupEnabled(0,false); Attached: public Men…… -
Unit testing – use arquillian and powermock in the same JUnit test
I want to use the functions of arquillian and powermock in the same JUnit 4 test The problem is that both products are…… -
Java garbage collection mechanism
When it comes to garbage collection (GC), many people naturally associate it with Java. In Java, programmers don't nee…… -
Java garbage collection mechanism
When it comes to garbage collection (GC), many people naturally associate it with Java. In Java, programmers don't nee…… -
Deploying spring boot programs using Linux
*** After using the command to start the program, if SSH is disconnected, will the program be shut down? The first pro……