Starting JShell
Before trying to start JShell, make sure your JAVA_HOME environment variable points to a JDK 9 installation. To start JShell, run the following command:
$ jshell
If all goes well, you should see a jshell> prompt.
Exiting JShell
To exit JShell, run the following command from...
The DividerItemDecoration is a RecyclerView.ItemDecoration that can be used as a divider between items.
DividerItemDecoration mDividerItemDecoration = new DividerItemDecoration(context,
mLayoutManager.getOrientation());
recyclerView.addItemDecoration(mDividerItemDecoration);
It su...
The keyword function can be used to initiate pattern-matching on the the last argument of a function. For example, we can write a function called sum, which computes the sum of a list of integers, this way
let rec sum = function
| [] -> 0
| h::t -> h + sum t
;;
val sum : int list -&...
Drop/Delete your database
If you are using SQLite for your database, just delete this file.
If you are using MySQL/Postgres or any other database system, you will have to drop the database and then recreate a fresh database.
You will now need to delete all the migrations file except "init.py...
Once you become familiar with the code to call one method on one Google service, you will be able to infer how to call any method on any Google service.
First, we make a connection to the service using the credential object instantiated in the previous example:
CloudResourceManagerService service ...
Once you become familiar with the code to call one method on one Google service, you will be able to infer how to call any method on any Google service.
First, we make a connection to the service using the credential object instantiated in the previous example:
service = build(
SERVICE_NAME,
...
You can also create a custom target to run when you want to perform a particular task. These are typically executables that you run to do different things. Something that may be of particular use is to run Doxygen to generate documentation for your project. To do this you can do the following in you...
Latest Android Studio will create & integrate a Basic Widget to your Application in 2 steps.
Right on your Application ==> New ==> Widget ==> App Widget
.
It will show a Screen like below & fill the fields
Its Done.
It will create & integrate a basic HelloWorld Widget(I...
A single instance of Node.js runs in a single thread. To take advantage of multi-core systems the user will sometimes want to launch a cluster of Node.js processes to handle the load.
var cluster = require('cluster');
var numCPUs = require('os').cpus().length;
if (cluster...
Let's see how we can organize the code, when the codebase is getting larger.
01. Functions
fn main() {
greet();
}
fn greet() {
println!("Hello, world!");
}
02. Modules - In the same file
fn main() {
greet::hello();
}
mod greet {
// By default, everything inside a...
To develop an application for watchOS, you should start with Xcode. Xcode only runs on macOS. At the time of writing, the latest version is Xcode 8.3.
If you want to start a new project from scratch:
Boot up your Mac and install Xcode from the App Store if it's not already installed.
Choo...
strComputer = "."
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2")
Set colItems = objWMIService.ExecQuery("Select * from Win32_DesktopMonitor",,48)
For Each objItem in colItems
WScript.Echo "ScreenHeight: " &am...
One very simple thing that you might want to do with NMS that Bukkit doesn't support is get the player's ping. This can be done like this:
/**
* Gets the players ping by using NMS to access the internal 'ping' field in
* EntityPlayer
*
* @param player
* the player whose ping t...
This will be our example data frame:
df = pd.DataFrame({"color": ['red', 'blue', 'red', 'blue']},
index=[True, False, True, False])
color
True red
False blue
True red
False blue
Accessing with .loc
df.loc[True]
color
True red
True red
...
This will be our example data frame:
color name size
0 red rose big
1 blue violet big
2 red tulip small
3 blue harebell small
Using the magic __getitem__ or [] accessor. Giving it a list of True and False of the same length as the dataframe will give you:
...
Opening a browser with to() method.
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
class navigateWithTo{
public static void main(String[] args) {
WebDriver driver = new FirefoxDriver();
driver.navigate().to("http://www.example.com...
To use Autofac in your project, all you have to do is install Autofac from NuGet Package Manager. Open the solution that want to use Autofac in, then select Manager NuGet Packages for Solution... by going to:
Tools -> NuGet Package Manager -> Manager NuGet Packages for Solution...
In the N...
Validating the Name entered by a User contain the following check
Ensure it is not empty
Ensure it contain only alphabets, space and/or dot.
So, the regular expression for this is
^[A-Z][a-z]*(\.?\s?[A-Z][a-z]*)+$
This means
^ -> Should start with
[A-Z] -> the first lette...
Let's take the Range is from 18 to 80.
So, to validate,
We should check that the age is a positive integer.
Then check it should be greater than or equal to 18 and less than or equal to 80.
The test to check whether it is a number or not can be performed by a simple regular expression like
^[0-...
