包含标签：Java 的文章
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Java – check string contents
I need to perform the following checks: If mystring contains() Any other character Letters A-Z, A-Z, "_, "–", numbers …… -
Why does my java code execute bash commands incorrectly?
I tried to make my java program interact with Linux bash, but something went wrong I have a simple executable prog tha…… -
Java – which JRadioButton to select
I have several jradiobuttons in the button group private ButtonGroup radioGroup= new ButtonGroup(); private JRadioB…… -
What is the guarantee of generic drugs in Java?
Although I know, generics are used to make our code more general and flexible But what is the guarantee of cast iron i…… -
Java – how to wait for all callables to complete execution before continuing?
I have the following hash code: public class MyCallable implements Callable<Long> { @Override public Lon…… -
How to return values from methods that contain arrays in parameters in Java?
I have this code, but it doesn't work! public class Trial { public static void main (String [] args) { …… -
Java – create viewholder final in custom listview adapter Android
I have a listview with such a custom adapter @Override public View getView(int position,View convertView,ViewGroup par…… -
The difference between void foo (t y) and void foo (t y) in Java generic classes
Explain in detail the differences (if any) between the following two versions of Java generic classes? class C<T>…… -
Java – how to create CSV files using servlets?
I want to download the CSV file from the servlet Data from object [] obj = search getSearch(); I have a data object []…… -
Java – when we change to bytes, why is the result – 2 when 127 * 2?
This is my code: public class test { public static void main(String[] args) { byte a=(byte)127,b=2; byt…… -
Java – rest Service on wildfly pathparam is empty
I am building a rest service using Jee 7 and deploying it on wildfly 8 With the exception of pathparam, everything see…… -
Algorithm – search for the 7th largest element in the largest heap?
So my friend and I don't agree on this issue It requires the time complexity of searching the 7th largest element in t…… -
Java monthly timer
I'm trying to create a timer / TimerTask that will run on the same day of each month I can't schedule a repeat timer b…… -
Java Concurrent HashMap
I want to convert concurrenthashmap to treemap Can I do that? Solution If you need a sorted concurrentmap, please chec…… -
Accessing subclass fields from a base class in Java
I have a base class called geometry, in which there is a subclass sphere: public class Geometry { String shape_name;…… -
Java – refresh the Android viewpager fragment on refresh
I'm new to Android. I really don't understand why the dynamically added fragment content (such as some images added af…… -
How to truncate PostgreSQL tables from JDBC
I have a PostgreSQL database. I want to truncate some tables using JDBC What do I do? This is what I've tried, but the…… -
Detect pending Linux shutdown
Since I install pending updates for my Ubuntu server as soon as possible, I have to restart my Linux server frequently…… -
Java [unchecked] unchecked case warning
Well, I've been looking around and doing a lot of Google searches, but I still can't find a way to avoid this warning …… -
How to use mockito to simulate a for loop
I'm new to mockito My question is how to use mockito to simulate a for loop? For eg: This is the main class: import ja…… -
Java – intentional Android contact information update?
I can use putextra to transfer information as additional data to create a new contact with intent. Can I use informati…… -
How to implement (x POW y) in Java, where x and y are double?
I want to calculate the power of X, y, x, y are double values Why did Java give me a compilation error? What is the be…… -
Get the location from the execution location of the Java code
I have a swing Java application that can save a lot of data (for example, you can consider games and their saving) The…… -
Does Java’s split overwrite the length of the array, even if it is pre initialized?
String [] arr = {" "," "," "}; // String arr = new String[4]; String [] arr = {" "," "," "}; // String arr = new Str…… -
Java: Refactoring static constants
We are refactoring some code We developed a feature in one project and we want to use it in other projects We are extr…… -
Java – calling the run method directly is not a good practice
In most cases, I want to run a piece of code in a new thread, which will take some time, but in some cases, I want to …… -
ORM – primary key – native, sequence or GUID key?
When I read this and this, and then read this (which ironically quotes the other two), I found that I wanted to know h…… -
wsgen vs java2wsdl
What is the difference between wsgen and Java2 WSDL tools? Solution The main purpose of wsgen in Jax - WS RI is to gen…… -
Java – how to attach a byte [] to a list?
How to attach the element of byte [] to list < byte >? Solution With guava, you can use bytes like this asList(b…… -
GWT: how to pass Java arrays to JavaScript native methods?
I have a string array, and now I want to pass it to the jsni function I tried to use jsarraystring in GWT, but I found…… -
Java – how to get the URL of the client
I will request from display JSP to trialshow JSP page, but whenever I call ${pageContext.request.requestURL} on TrialS…… -
Java – automatically in ‘system out. Display date in println() ‘statement
I know that every line you print can be marked with a date (and saved as a log file) For example, in minecraft: [16:21……