包含标签：Java 的文章
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Implicit super interface in Java?
So we all know that all classes implicitly extend object How about the interface? Is there an implicit super interface…… -
Java – why can I unexpectedly create multiple instances of my singleton class?
According to my knowledge, singleton design pattern means that we can only create a single object of one class The fol…… -
Java – aliastobeanresulttransformer and hibernate sqlQuery
I have a fairly complex query (HQL or criteria queries have too many nesting levels), so I write it as sqlQuery I real…… -
Understanding generic types in Java
I have a general class that says: @H_ 404_ 8@ @H_ 404_ 8@ MyClass<T>@H_419_12@ 在这个类的方法中,我想测试T的类…… -
Java – how to get parameters from the URL in Liferay portlet?
I used something like feed in Liferay 6 JSP of out of the box portlet such as jspf: String articleId =null; HttpServle…… -
Java – ArrayList removeall() does not delete objects
I have simple ArrayLists for member classes: ArrayList<Member> mGroupMembers = new ArrayList<>(); ArrayLis…… -
Concurrency – can I receive results from one of multiple goroutines in go?
I just learned about Google's programming language go I'm interested in the concurrency support it provides and set ou…… -
Java – splits the list into sub lists according to the conditions of the stream API
I have a specific question There are some similar problems, but these problems are either Python or Java, or even if t…… -
Can you comment on my java game?
I have marked this question as a community wiki, so no reply points will be thrown I made this game, forest defender, …… -
Java – cannot inherit from final class
I just created my first Android library In another application, I want to extend a class from it But it shows an error…… -
Is there any way to declare a method “friendly” in Java?
I know you can set the property to public, friendly or private to specify its visibility Is there any way to announce …… -
Java – get random numbers from ArrayList?
ArrayList<Integer> lista = new ArrayList<Integer>(); ArrayList<Integer> lista = new ArrayList<I…… -
After uninstalling Java and reinstalling it to a new location, eclipse will not start
I reinstalled the JDK tonight because there is embedded space in the program file... Now eclipse will explode immediat…… -
Java – how do I send messages from my android app to specific contacts via WhatsApp?
I'm developing an android app. I need to send messages to specific contacts of WhatsApp Uri mUri = Uri.parse("smsto:+9…… -
Merge sort Java
I'm trying to create a merge sort method, but it continues to give the wrong sort Where do I make changes to actually …… -
Java – can I create a bitmask for ~ 100 constants?
Does this mean that the 100th constant must be 1 < < 100? Solution You cannot do this directly because the maxim…… -
Java – why doesn’t my code compile which string starts with a vowel check?
if (flipped.charAt(0) = "a" || "e" || "i" || "o" || "u"){ if (flipped.charAt(0) = "a" || "e" || "i" || "o" || "u"){ …… -
Java – how to export the DDL of all objects (such as tables, indexes, etc.) in Sybase IQ / Sybase ASE without using any tools?
I've created a sample program, and I want to use get_ The DDL method obtains the DDL of all objects, such as table, tr…… -
Java – delete the lowest bit
Given a binary number, what is the fastest way to delete the lowest bit? 01001001010 – > 01001001000 It will be use…… -
Java – type conversion via composition (interfaces and classes)
When I try to use methods that contain generic classes, two of which implement interfaces, I have a major disconnect I…… -
Java – how to create a long value with all bits = 1
I tried the following methods: public static final long DEVICE_ID_UNKNowN = 0xFFFFFFFFFFFFFFFF; But it can lead to The…… -
How to use reduce to sort lists in Java 8?
I have an object list list < BOM > in BOM, I have a list < bomline >, and now I have to use reduce pair Bo…… -
PowerMockito：java. lang.NoClassDefFoundError
I need to simulate a static final class in JUnit test: private MyFinalClient client; @Before public void setup() { …… -
Using generics in Java
I just started using Java, so this may be a stupid question for most people, Set<T> mySet; Eclipse gives an erro…… -
Java – a common JPA repository for multiple entities
I have several entities and use the spring data JPA repository and specifications to query my database Therefore, I cr…… -
Java . Charat (I) comparison problem
Why do you have to get a char from a string when comparing a char with another char? For example; It doesn't work whil…… -
JavaFX: draw sharp thin lines
I want to know how to use JavaFX to draw sharp thin lines I think my line is black, 1 pixel high This is what I have n…… -
Use lambda to provide stack based context (for example, the path of a file operation)
I have a subtle way (which may have been implemented and discussed) to do the same in groovy (from groovy documentatio…… -
Implementation of redblacktree insertion in Java
I am trying to implement the CLRs pseudo code of red black tree NullPointerException is thrown when I try to run the p…… -
Java – bounded wildcard of static factory pattern of return type
I read in effective Java that you shouldn't use bounded wildcards as return types, but I don't know what I should do T…… -
Java: find out what uses all memory
I have an out of memory Java application, but I don't know which code is allocating memory Is there an app I can view?…… -
Java – Jenkins – configure JDK – text box only, and automatic installation fails
I'm trying to create a Jenkins - based build server for our Android application The build failed because it cannot aut……