Tutorial by Examples: am

Cryptography is something very hard and after spending a lot of time reading different examples and seeing how easy it is to introduce some form of vulnerability I found an answer originally written by @jbtule that I think is very good. Enjoy reading: "The general best practice for symmetric e...

Throughout this example it is assumed that the 'root' object that is being serialized to JSON is an instance of the following class : public class MyJson { }   Example 1 : An example of an instance of MyJson, as is: {} i.e. since the class has no fields, only curly brackets are serialized...

This is a script saved as .Rmd, on the contrary of r scripts saved as .R. To knit the script, either use the render function or use the shortcut button in Rstudio. --- title: "Rstudio exemple of a rmd file" author: 'stack user' date: "22 July 2016" output: html_document -...

Open Xcode and select Create a new Xcode Project. Now select iOS > Application on the left and Game on the main selection area. Press Next. Write into Product Name the name of your first great game. Into Organization Name the name of your company (or simply your own name). Organisation I...

Let's say you have a User model class User < ActiveRecord::Base end Now to update the first_name and last_name of a user with id = 1, you can write the following code. user = User.find(1) user.update(first_name: 'Kashif', last_name: 'Liaqat') Calling update will attempt to update the gi...

Write to a file test.txt: String filepath ="C:\\test.txt"; FileOutputStream fos = null; try { fos = new FileOutputStream(filepath); byte[] buffer = "This will be written in test.txt".getBytes(); fos.write(buffer, 0, buffer.length); fos.close(); } c...

// Example of raw dynamic size array. It's generally better to use std::vector. #include <algorithm> // std::sort #include <iostream> using namespace std; auto int_from( istream& in ) -> int { int x; in >> x; return x; } auto main() -> int { ...

// Example of std::vector as an expanding dynamic size array. #include <algorithm> // std::sort #include <iostream> #include <vector> // std::vector using namespace std; int int_from( std::istream& in ) { int x = 0; in >> x; return x; } ...

Unfortunately as of C++14 there's no dynamic size matrix class in the C++ standard library. Matrix classes that support dynamic size are however available from a number of 3rd party libraries, including the Boost Matrix library (a sub-library within the Boost library). If you don't want a dependenc...

Basic usage of dependency injection is done by the annotations. When you need to tweak things a little bit, you need custom code to further specify how you want some classes to be instantiated and injected. This code goes in what is called a Module. import com.google.inject.AbstractModule // Pla...

The macro WITH-INPUT-FROM-STRING can be used to make a stream from a string. (with-input-from-string (str "Foobar") (loop for i from 0 for char = (read-char str nil nil) while char do (format t "~d: ~a~%" i char))) ; 0: F ; 1: o ; 2: o ; 3: b ;...

Gray streams are a non-standard extension that allows user defined streams. It provides classes and methods that the user can extend. You should check your implementations manual to see if it provides Gray streams. For a simple example, a character input stream that returns random characters could ...

In a module (library or application) where you need the aar file you have to add in your build.gradle the repository: repositories { flatDir { dirs 'libs' } } and add the dependency: dependencies { compile(name:'nameOfYourAARFileWithoutExtension', ext:'aar') } Pay a...

JsonReader reads a JSON encoded value as a stream of tokens. public List<Message> readJsonStream(InputStream in) throws IOException { JsonReader reader = new JsonReader(new InputStreamReader(in, "UTF-8")); try { return readMessagesArray(reader); } finall...

The CSS multi-column layout makes it easy to create multiple columns of text. Code <div id="multi-columns">Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation...

Simple Example (centering a single element) HTML <div class="aligner"> <div class="aligner-item">…</div> </div> CSS .aligner { display: flex; align-items: center; justify-content: center; } .aligner-item { max-width: 50%; /*for d...

@input is useful to bind data between components First, import it in your component import { Input } from '@angular/core'; Then, add the input as a property of your component class @Input() car: any; Let's say that the selector of your component is 'car-component', when you call the compone...

It is possible to upload multiple parts, each with a different name. For each part name, you will need one parameter annotated with @RequestPart, whose name matches the part name. To receive a file uploaded via an HTTP Post, you need to do the following: @RequestMapping( value = "...&quo...

Creating a custom ImplicitNamingStrategy allows you to tweak how Hibernate will assign names to non-explicitly named Entity attributes, including Foreign Keys, Unique Keys, Identifier Columns, Basic Columns, and more. For example, by default, Hibernate will generate Foreign Keys which are hashed an...

The following code can be entered in a Tcl shell (tclsh), or into a script file and run through a Tcl shell: puts "Hello, world!" It gives the string argument Hello, world! to the command puts. The puts command writes its argument to standard out (your terminal in interactive mode) an...