包含标签:Java 的文章
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Java – factory pattern dynamic method
I'm trying to understand the factory model If there are many implementations, there will be many switch cases in my fa…… -
Java – it makes sense to override the methods in the interface
There is already an answer to this question: > why Java 6 overrides keyset(), entryset() and values() interface in …… -
Avoid checkstyle magic number errors in JDBC queries
I'm having a group project in class. We're trying checkstyle I'm very satisfied with Java, but I've never touched JDBC…… -
. Net and Httpwebrequest are equivalent in Java?
. Net has Httpwebrequest and webclient to simulate browser requests I will Google, but I don't know what keywords to u…… -
[ljava. Lang. object; cannot be discarded
I want to get the value from the database. In my case, I use list to get the value from the database, but I receive th…… -
Java: cloning arbitrary collections by referencing collections
Suppose you have a method of type Java util. Collection, and it can't be said which Java it will point to at run time …… -
Java – why do we have immutable empty maps?
/** /** * Returns the empty map (immutable). This map is serializable. * * <p>This example illustrates the t…… -
Java – WebService call timed out from the client
I am using resteasy client to call WebService One requirement is to abort / timeout the call if the running time excee…… -
Java – how to create a global variable in Android?
See English answers > 12 Android global variables I've tried to put it in a custom class, but the problem is that i…… -
Java – use App Engine to customize the data storage location on the local computer
I am developing App Engine Application in Android studio and testing it on the local computer (using local data store)…… -
Java – why compile code with consecutive semicolons?
According to my scientific Java experiment, int x = 0; Equivalent to int x = 0;; This is equivalent to int x = 0;;;;;;…… -
java. Lang.illegalargumentexception: the observer is null
A user of one of my applications reported this error I'm confused about how to solve what it means After a Google sear…… -
Java – Android support library: getdrawable independent vector or not
When using Android > = 5.0, Drawable d = getResources().getDrawable(R.drawable.icon) Parse the XML correctly and re…… -
Java – anti hacking solution for secret keys in Android applications?
I need to store a private string key in the application Its value never changes and is set manually in the code I can'…… -
Java – cachedrowsetimpl cannot resolve to a type
I am using cachedrowset to save the resultset form dB CachedRowSetImpl crs = new CachedRowSetImpl(); But eclipse remin…… -
Java EE – inject @ EJB beans according to conditions
A novice question: can I inject different beans according to the conditions I set in the properties file This is what …… -
Java – convert bufferedimage to byte without I / o []
Hi, I have a buffered image instance in memory and want to convert it to byte [] to encode it into Base64 string witho…… -
Java – how to programmatically kill a storm topology?
I'm using a Java class to submit a topology to the storm cluster, and I'm also going to use a Java class to kill the t…… -
Java: accessing subclass variables using parent methods
I have the following conditions: public class A { private int x = 5; public void print() { Syste…… -
Java – converts a string to a date using a time zone
I have a string pattern yyyy MM DD HH: mm a I want to convert it to the following format yyyy-MM-dd HH:mm:ss Z What …… -
java. util. What is the runtime of equals() in arrays?
As the title shows, Java util. What is the runtime of equals() in arrays? For example, if you compare two ints [], doe…… -
Java – how can pattern search be faster?
I'm processing about 1GB of incremental files and I want to search for a specific pattern Solution Basically, what you…… -
Java – elasticsearch – using filterbuilders
I'm new to elasticsearch and couchbase I'm building a sample Java application to learn more about elasticsearch and co…… -
Sort the array by length, then alphabetically
How do I arrange arrays alphabetically? I have a list of numbers that I'm getting: Something1 Something10 Something2 S…… -
Java – no JPA transaction is currently active
It is implemented using JPA and eclipse link Code: try{ if(!em.getTransaction().isActive()) em.getTransact…… -
Java – let Android applications listen to shared links
When a user shares a URL from another application (such as a browser), I want my Android application to appear as an o…… -
Java – how to quickly create instances in CDI
Let's suppose I have a car class In my code, I want to create 10 cars The car class has some dependencies on the @ inj…… -
Java – server 415 response code
I'm using jetty web server and Jersey for rest processing I define: @POST @Path("/sendMessage") @Consumes ({MediaType.…… -
What kind of things can you use Java instead of Python?
I will choose a new programming language, Java, and have been using Python for some time But it seems that most things…… -
java – PropertyNotFoundException:Target Unreachable,’null’returns null
See the English answer > identifying and solving javax el. Propertynotfoundexception: target unreachable7 WARNING: …… -
How do I attach to a Java exception?
I am a novice and general exception to Java In my previous days of C / Perl programming, when I wrote a library functi…… -
Java – capture outofmemoryerror
Is there any memory error (Java. Lang. outofmemoryerror) in Java? Solution Yes Here are several examples to illustrate……