包含标签：Java 的文章
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Java – Scala check optional string is null or empty
I'm new to scala. I want to learn how to add null and null checks to optional strings? val myString : Option[String] …… -
Java – x = x equals x = 2x 1: why?
The question is just curiosity: I want to know what the value of some int x is after the x = x line int x=10; x+=++x; …… -
Java – manifest merge failed – access to Google Maps V2
Hello, I'm building an application through the stackskills lollipop tutorial in Android studio I'm fully following the…… -
Why double in Java for a long time?
SSCCE： public class Test { public static void main(String[] args) { Long a = new Long(1L); new A…… -
Java – how to find duplicate rows and display the number of repetitions before them
Yes, it's a trivial problem, but I didn't find a duplicate problem Currently, from this collection (ArrayList): Java C…… -
Java – spring boot – the request method ‘post’ is not supported
Exception pagenotfound: request method 'post' is not supported in my spring boot application This is my controller: @R…… -
Why does Java enum need to check class and declaringclass in the CompareTo method
The type parameter E in enum is defined as < e extends enum < E > > So why do we need to check getClass ()…… -
Java – IIS 403 that prohibits the use of / in URLs
I have IIS (Microsoft IIS / 7.5) returned 403 Forbidden, I can't figure out why I narrow it down to / but only if it h…… -
Java conversion / classloader problem
The following is a simplified version of the problem: SomeClass c = (SomeClass) obj.getSomeClassParent() Not always, e…… -
Java – expect this loop to be infinite, but it’s not
This is my java code: public class Prog1 { public static void main(String[] args) { int x = 5; whi…… -
What are the problems with using objects in Java to call static methods?
If I have the following: class A { public A() { } public static void foo() { System.out.println("foo() called"); }…… -
Java multithreading – passing data structures to threads
The application I'm writing generates a characterlist character at some stage At this stage, I am trying to create a t…… -
Read / write int on X86 machine without lock
Suppose in a C program, I have a p thread running on a 32-bit machine and int Max – a shared 32-bit integer Each threa…… -
A Java method class with enum
I have an enumeration that looks like public enum MyEnum { myValue { @Override public String myMethod(Stri…… -
Java – how to fix errors when inserting datetime into DB
I want to do this: pr.setStartdate("2006-09-10T00:00:00"); I received this error: java.sql.sqlDataException: The Synta…… -
Java – how do I use relative paths instead of absolute paths?
So I have a strange question about Java I'm reading and writing files, so the path is very important to me I want all …… -
How to convert a string date with a full month name into a date object in Java?
How to convert a date with a full month name into a date object in Java? This is the sample I need to convert. Date: D…… -
Java – complexity of code
What is the complexity of a program with only one loop? Is it log n? Solution Well, it really depends on what happens …… -
java. util. prefs. Preferences. Put() is valid, but preferences Nodeexists() always returns false
I have some simple code for learning OAuth authentication using the landmark library I'm trying to use Java util. pref…… -
Language independent – use hash mapping to optimize the binary tree and insert o (1) to write to the subtree
First of all, I assume that I have missed some important things when considering this problem, but I still want to rel…… -
Java – JList with custom renderer
I have a JList that displays multiple jpanels, and I created a custom renderer that returns the new JPanel thank you S…… -
Java: why does set mention all the methods in the collection
http://download.oracle.com/javase/tutorial/collections/interfaces/set.html Why does the set interface list all the met…… -
Java – calculate line of code – quality metircs
I'm providing lines of code for my java project, which also contains many XML files Now my problem is to calculate the…… -
Java threads: determine which threads are still running
For debugging purposes, I want to find out which threads of my program are still running It appears that one or more t…… -
Java – convert InputStream to FileInputStream
I have read this article how to convert InputStream to FileInputStream However, if you are using a resource in a jar f…… -
Multithreading – use non thread safe components with multithreaded components (Design)
Design issues: Using non thread safe components in multithreaded components (collection, API,...) Example: Component1:…… -
How to append to the end of a file in Java?
... ... Scanner scan = new Scanner(system.in); System.out.println("Input : "); String t = scan.next(); FileWriter kir…… -
. Net and Java EE middleware?
Someone can compare Net and Java EE middleware (advantages / disadvantages) If not, at least provide a useful link for…… -
When should I use Java in ColdFusion applications?
Of course, the respondents to the question know that ColdFusion is a Java EE application that can access all the under…… -
Create a java program to search for specific word files
I'm just learning that language and want to know what experience Java programmers will have in the following situation…… -
Java – configure spring data sources for hibernate and @ transactional
At this time, I am using the drivermanagerdatasource with @ transactional annotation to manage transactions But all tr…… -
Java – why doesn’t the runnable jar exported from eclipse work?
I have a project that works well from eclipse Edit (it was not previously run with - jar): INFO: Loading XML bean deFi……