This is a very common workflow when using Ansible for provisioning an AWS EC2 instance. This post assumes a basic understand of Ansible and most importantly, assumes you've properly configured it to connect to AWS.
As Ansible official documentation insists, we are going to use four roles:
1- ami_f...
There is a maximum capacity an integer can store. And when you go over that limit, it will loop back to the negative side. For int, it is 2147483647
int x = int.MaxValue; //MaxValue is 2147483647
x = unchecked(x + 1); //make operation explicitly unchecked so that the ...
Overflow also happens during the operation. In the following example, x is an int, 1 is an int by default. Therefore addition is an int addition. And the result will be an int. And it will overflow.
int x = int.MaxValue; //MaxValue is 2147483647
long y = x + 1; //...
To install an APK file, use the following command:
adb install path/to/apk/file.apk
or if the app is existing and we want to reinstall
adb install -r path/to/apk/file.apk
To uninstall an application, we have to specify its package
adb uninstall application.package.name
Use the following...
import cv2
image_path= #put your image path here
#use imread() function to read image data to variable img.
img = cv2.imread(image_path)
#display image data in a new window with title 'I am an image display window'
cv2.imshow('I am an image display window',img)
#wait until user hi...
Java Logging Api has 7 levels. The levels in descending order are:
SEVERE (highest value)
WARNING
INFO
CONFIG
FINE
FINER
FINEST (lowest value)
The default level is INFO (but this depends on the system and used a virtual machine).
Note:
There are also levels OFF (can be used to turn log...
It's also possible to use data binding within your RecyclerView Adapter.
Data model
public class Item {
private String name;
public String getName() {
return name;
}
}
XML Layout
<TextView
android:layout_width="wrap_content"
android:layou...
With the ~ selector, you can easily implement a global accessible boolean without using JavaScript.
Add boolean as a checkbox
To the very beginning of your document, add as much booleans as you want with a unique id and the hidden attribute set:
<input type="checkbox" id="sideba...
C++11
The C++11 standards guarantees that the initialization of function scope objects are initialized in a synchronized manner. This can be used to implement a thread-safe singleton with lazy initialization.
class Foo
{
public:
static Foo& instance()
{
static Foo inst;
...
Suppose you have complex code that creates and returns a list by starting with a blank list and repeatedly appending to it:
def create():
result = []
# logic here...
result.append(value) # possibly in several places
# more logic...
return result # possibly in several places...
First, Install gulp and gulp-concat plugin to your project localy
npm install --save-dev gulp gulp-concat
and add gulp-concat task to your gulpfile.js
var gulp = require('gulp');
var concat = require('gulp-concat');
gulp.task('default', function() {
});
gulp.task('css', function() {
...
First, Install gulp, gulp-clean-css and gulp-rename to project directory localy
npm install --save-dev gulp gulp-clean-css gulp-rename
Than add following minify-css task to your gulpfile.js
var gulp = require('gulp');
var cleanCSS = require('gulp-clean-css');
var rename = require('gulp-rename...
First, Install gulp and gulp-minify to project directory locally
npm install --save-dev gulp gulp-minify
Then add following min-js task to your gulpfile.js
var gulp = require('gulp');
var minify = require('gulp-minify');
gulp.task('min-js', function() {
return gulp.src('lib/*.js')
...
An existing working copy can be quickly transformed to reflect the contents of a different branch in the same repository. For example, you might have a working copy of the trunk and now need to work on a development branch. Instead of checking out a completely new working copy (which can waste a l...
"Tags" are a type of label that can be applied to a repository at a certain point in time. They are frequently used to give human-readable names to important milestones so that they can be easily accessed later (for example, "version-1.2").
Creating a tag is exactly the same as...
A Subversion repository can be configured so that certain contents or commands are only accessible to certain users. In order to access this restricted content, you will need to specify a username and password.
Your username and password can be specified directly as part of the command:
$ svn che...
public class IntStack {
private IntStackNode head;
// IntStackNode is the inner class of the class IntStack
// Each instance of this inner class functions as one link in the
// Overall stack that it helps to represent
private static class IntStackNode {
privat...
A full explanation of Access Modifiers in Java can be found here. But how do they interact with Inner classes?
public, as usual, gives unrestricted access to any scope able to access the type.
public class OuterClass {
public class InnerClass {
public int x = 5;
}
p...
