包含标签：Java 的文章
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How to randomly select a letter (A-Z) in Java?
If I want to randomly select a letter between a and Z, I assume I have to use the random class: Random rand = new Rand…… -
Java-8 – why can’t @ functionalinterface be applied to Sam abstract base classes
I just started learning camels. The first thing I saw was context.addRoutes(new RouteBuilder() { public void c…… -
Conditional if else statements in Java
See English answers > why does the internal operator unexpectedly cast integers? two public class Pre { public …… -
Java – extends activities in the navigation bar to other activities
I'm trying to create a navigation drawer activity, so I can expand the activity, use menus in all activities and follo…… -
Java – why this numberformatexception?
I have this stack trace (part) Servlet.service() for servlet action threw exception java.lang.NumberFormatException: F…… -
Why does Java use merge sort to sort arrays larger than element 7
According to Wikipedia: But why? Both merge sort and quick sort are o (n log n) Solution The difference of the algorit…… -
Is there a “best” or most popular database with stand-alone Java applications?
Is there a "best" or more popular database with stand-alone Java applications? Update: talk about small applications (…… -
Java – jasperreports is exported to xlsx instead of XLS
I can't find how to export jasperreports 4.1 1 Xlsx file JRXlsExporter There is no xlsx equivalent I can't find a para…… -
Java – Android – open or restart the application after clicking the push notification using the flag activity
I use push notifications in Android When I receive a push notification, if the application is still running, I want to…… -
Create a zero int array in Java
How do I initialize all elements of an array to 0? for example int[] array = new int[10]; return array[2]; Should retu…… -
Java – maps strings to integers
The simplest method in Java is to map a string (Java string) to a (positive) integer (Java int) >Are equal strings …… -
Java – split screen in libgdx
The question is short and simple How to create split screen effect in libgdx If I create two cameras, it will draw one…… -
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…… -
Multithreading – creating threaded local objects on Scala
I'm writing a computing library in scala Similar functions I grouped into local Scala singleton objects containing som…… -
Java – create immutable objects using JAXB
I am using JAXB to create Java objects from XSD files I'm creating immutable wrappers to hide JAXB generated objects (…… -
Java – how do you ensure that multiple threads can safely access class fields?
How do you maintain thread safety when accessing class fields through getter methods through multiple threads? Is the …… -
Java – when using HashMap, the values and keys are guaranteed to be in the same order during iteration?
When I iterate over values or keys, are they related? Map the second key graph to the second value? Solution No, not n…… -
Java EE – GlassFish V3 domain server cannot start The port is occupied
I imagine this is a very general mistake I can't seem to find any files I'm just trying to run a Java Web project with…… -
How to run Java programs on the server?
I've made a will The data in CSV file is stored in the Java application of MySQL database Now my client wants to uploa…… -
Unit test cases using JUnit (robolectric or mockito or both in Android)
This is the first time I have written unit test cases in Android So I searched a lot of things >Robolectric framewo…… -
Java – Eclipse’s $fall-through $annotation standard?
I use eclipse, so I use / / $fall - through $annotation, which is a common practice in switch statements and so on But…… -
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……