包含标签：Java 的文章
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Java – horizontal recycler view with left and right arrow indicators
I'm trying to use the left and right arrow indicators to achieve a horizontal loop view So what happens is that if you…… -
Java – if first is true, it is logical or the second statement is ignored
See English answers > java logical operator short circuiting 9 Solution No, No >Using the Boolean operator |, if…… -
Java – Operator ‘cannot be applied to’t’, which represents a bounded generic type
See English answers > generic type extending number, calculations 2 class MathOperationV1<T extends Number> {…… -
Unit test – unit test vertx – Java util. concurrent. TimeoutException
I'm trying to test HTTP calls from the vertx webclient unit using the rxified version of vertxunitrunner and vertx The…… -
Java – will this implementation be called an anonymous class?
I've seen it many times, but I'm a little confused. Will it be called anonymous class? public class Test { public …… -
Java – tells class members the type of variables at creation time
Suppose I have a citydistrict class, as follows: class CityDistrict { List<House> houses; ... } Suppose …… -
Java – gson: parameter get serialized, even if it has @ expose (serialize = false)
I'm writing SDK for JSON API, and I encountered a seemingly strange problem The API is very strict in post data valida…… -
Java – why don’t these semicolons produce errors?
See English answer > what is the use of an empty statement (not for loop) in Java? [closed] 6 public class Main{ …… -
Assign the return value to the new variable (Java)
It's been a while since I did some java coding I need to build an application for the business that needs to be automa…… -
Java – hibernate extra query after join fetch on the same entity
I try to query a large number of entities by using this query, although Hibernate: "Select * " + " From Dossie…… -
Java – get the POI Workbook of InputStream for OM Apache
Is there any way to get the InputStream of Apache POI workbook? I need it to pipe to another OutputStream, but I can't…… -
Java – Jackson captures unrecognized fields in the map
I use Jackson in Java rest API to handle request parameters My class: public class ZoneModifBeanParam extends ModifBea…… -
Java – the spring boot cannot parse placeholders in strings
I run spring boot on the embedded Tomcat server through Maven and MVN clean install spring boot: run But every time I …… -
Java – rewrite the same method twice from the same class
I understand how the iterator () method works with the ArrayList class In the ArrayList class, I found that the iterat…… -
Java – missing annotation handling menu in eclipse
I use this manual https://github.com/excilys/androidannotations/wiki/Eclipse-Only-Configuration "5 Go to Java Compiler…… -
Close, destructor and finalize: Java conflict
See English answers > why does a try / catch block create new variable scope? 5 try { FileInputStream in = new Fil…… -
External configurable filtering using java lambda
Suppose I have an external JSON: [{ "condition": "equals","field": "name","value": "jack" },{ "condition": "…… -
Java – Maven: exclude the “meta-inf / Maven” folder from the jar
I use Maven to build jars When I checked the jar, I saw a maven folder in the meta - inf folder I want it to be exclud…… -
String concatenation does not work in Java when concatenating two results of a ternary operator
Dear Java master! Please explain why concatenation does not work properly in Java when connecting two results of terna…… -
Java – programming the difference between POJOs and beans
I have the following two classes Can I say that the first is a POJO class and the second is a bean class? 1) POJO clas…… -
Why is the combiner function reduction operation not performed in the java-8 stream?
See English answers > java 8 stream – reduce function's combiner not getting executed Stream.of(1,2,3,4,5,6,7).redu…… -
Java – returns only the last element in the ArrayList
I've been teaching myself Java. I've always insisted on a problem. No matter what I do, it seems that I can't solve it…… -
Java – use groupingby for nested maps, but collect different types of objects
So I have the code for this "work" (replace some names for simplicity): Map<String,Map<String,ImmutableList<S…… -
How to use multiple streams and in Java 8 with lambda expressions Map function
I have a list County, which only contains the unique county name, and a list txcrarray, which contains the city name, …… -
Bean validation message with dynamic parameters
I started using bean validation, and I'm trying to build constraints My constraint is to verify CPF (personal file in …… -
Java – spring startup projects imported in IntelliJ do not work
I have imported the spring boot project generated by the spring boot initialiazr website, and I can't find the spring …… -
Java – ArrayList to array conversion – toarray() function infers that the type does not meet the upper limit error
This is the code simplet: Excel excel = new Excel(); ArrayList<Integer> a1=excel.readExcelSheet("C:\\Users\\Madh…… -
How to add classes that implement interfaces to ArrayList
In order to implement all methods in the interface, I created an abstract class that implements the interface, and the…… -
Java – why is there no exception in this byte?
I initialized a byte as follows: byte b = (byte) 0b11110000000; Since a byte is 8 bits in size, I expect it to throw s…… -
Lambda – the Java 8 stream is composed of three fields and aggregated by sum and count to produce single line output
I know that similar problems have been raised in the forum, but none of them seem to have completely solved my problem…… -
Java – array initializers are not allowed here
I have some model classes. I try to declare a list with them, but I get that the array initializer is not allowed here…… -
Java – cut and stack arrays
I have an int array as input The length of the array is always 2 ^ n. I want to cut the array in half and stack it Rep……