包含标签：Java 的文章
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Java StringBuilder. Setlength() – is the time complexity O (1)?
I'm going to do a lot of deleting the last character in stringbuilders Use sb Setlength solution (sb. Length() – 1); I…… -
How do I change simpledateformat to jodatime?
I need to change simpledateformat to another format, which is equivalent in jodatime public static String dateFormat(D…… -
Java – ArrayList deletes elements with indexes 0 and 1
I want to delete the elements in the ArrayList with indexes 0 and 1 But it doesn't work. I don't know how The code is …… -
Java – alternative to observable pattern?
When some state changes occur on object2, I need to perform some tasks on object1 Is there another way to use this pat…… -
How to automatically crop the white border of an image in Java?
What is the easiest way to automatically crop a picture with a white border in Java? Thank you in advance Solution If …… -
Does Java 1.7 use different character encodings?
We migrated our application from Java 1.6 to Java 1.7 We recompile the code using java 1.7 and receive an error at com…… -
Java – what type of data structure should I use to save table rows?
I'm a novice in Java. I just enter the query database So far, my results are in resultsetmetadata I think for each row…… -
How do I find country names from city names in Java?
I want to get the country name of Twitter users To this end, from < location >, some users wrote the label of th…… -
Java – understand the main loop in foreachtask of streams API
It seems that the core of parallelization of Java streams is foreachtask Understanding its logic seems crucial to obta…… -
. What is the Java equivalent of aggregateexception of. Net?
Yes Net, the aggregateexception class allows you to throw an exception containing multiple exceptions For example, if …… -
Java – how to use Jfilechooser to get directory paths?
I have a small java GUI application with a text field on it When the user clicks the text field, an event is triggered…… -
Java — Thinking about interface rewriting method
I have the following code. The generic ITest interface is extended by the non generic itestdouble interface Itestdoubl…… -
How do I get all the components of the panel in Java swing?
How do I get all the components of the panel in Java swing? Is there a method like foreach in c# to handle all the sub…… -
Java – parsing XML feed modules using “element already used”
I am parsing xml feeds using simplexml in Android: http://backend.deviantart.com/rss.xml?type=deviation&q=by%3Aspy…… -
How to make a full screen Java applet?
I am designing a psychology experiment using java applet I have to make my java applet full screen What is the best wa…… -
Why is java a compilation and interpretation language when jit also compiles bytecode?
I read that if a java source code is compiled into 'bytecode', then JIT is compiled into 'machine code' That is, the s…… -
Java – recursively cancel alloff completable future
If I had CompletableFuture<Something> future1 = service.request(param1); CompletableFuture<Something> futu…… -
Correctly handle null observable in rxjava
I have a situation where I'm creating an observable that contains database results I'm applying a series of filters to…… -
How to use “if else” in Rx Java chain?
I'm new to RX Java / RX Android I want to implement this case: choose different methods according to some conditions i…… -
Java – why is “010” equal to 8?
My simple question is why: System.out.println(010|4); Print "12"? I understand the bitwise OR operator, but why is "01…… -
RX Java – the process on the background thread is observable
I'm using RX Android for streaming In my real use case, I get a list from the server (using retrofit) I'm using the sc…… -
Java – simulate rest calls using mockrestserviceserver
I am trying to write a JUnit test case to test the methods in the auxiliary class This method uses rest to call extern…… -
Java — debug a maven program from Eclipse
I have a project in eclipse that has the following package structure after assembly launcher.tar.gz |-- launcher.jar …… -
Java – “iteratable cannot be converted to list” – is not an “iteratable” of type “list”?
I called a getelements method that returns iteratable < element > I do this: List<Element> elements = (Lis…… -
java. util. Currency. GetInstance throws illegalargumentexception
I just use Java util. Currency to try my hand, but for very few currency codes, it throws my java lang.IllegalArgument…… -
Java – find an integer n > 0 that contains the following three conditions
Some definitions of starter: flip (n) is the 180 degree rotation of seven segment display font numbers, so a 7 / 2 fon…… -
Java – method level spring configuration file?
I want to introduce some methods that are only implemented in the development process I thought I could use the spring…… -
Java – how to create an independent executable jar using Maven?
I want to package it in a separate executable jar for distribution I need an executable like main Jar and all dependen…… -
Java – annotation based validation framework
I am looking for an annotation - based validation framework that will allow me to validate parameter values Similar to…… -
Java – what is the best way to update entities in JPA?
I am using JPA for some CRUD operations Do you want to update a correct method? By updating the query or by finding th…… -
Multithreading – is there a greendao thread safety best practice?
I've gone with greendao and it's all good so far One thing that doesn't seem to be covered in documents or websites (o…… -
java – View. Onclicklistener() function or interface
View. Is onclicklistener() a function or an interface? When we try to set up an onclicklistener () method in Android, ……