Tutorial by Examples: g

Some applications that use Hibernate generate a huge amount of SQL when the application is started. Sometimes it's better to enable/disable the SQL log in specific points when debugging. To enable, just run this code in your IDE when you are debugging the aplication: org.apache.log4j.Logger.getLog...

Generally, if we want to remove an element from an array, we need to know it's index so that we can remove it easily using remove(at:) function. But what if we don't know the index but we know the value of element to be removed! So here is the simple extension to an array which will allow us to re...

# models fit1 <- lm(mpg ~ wt, data = mtcars) fit2 <- lm(mpg ~ wt+hp, data = mtcars) fit3 <- lm(mpg ~ wt+hp+cyl, data = mtcars) # export to html texreg::htmlreg(list(fit1,fit2,fit3),file='models.html') # export to doc texreg::htmlreg(list(fit1,fit2,fit3),file='models.doc') Th...

Using Angular markup like {{hash}} in a src attribute doesn't work right. The browser will fetch from the URL with the literal text {{hash}} until Angular replaces the expression inside {{hash}}. ng-src directive overrides the original src attribute for the image tag element and solves the problem ...

NOTE: This example is WIP, it will be updated with diagrams, images, more examples, etc. What is Phong? Phong is a very basic, but real looking light model for surfaces that has three parts: ambient, diffuse, and specular lighting. Ambient Lighting: Ambient lighting is the simplest of the t...

As of IntelliJ IDEA version 2016.2, and IdeaVim version 0.46, IntelliJ's native option for showing line numbers is ineffective. When clicking Show line numbers, the line numbers immediately show and disappear. This problem is caused by a bug in the IdeaVim plugin, which can be resolved by using the...

By default, some keystrokes that are useful in Vim contradict with the keystrokes of IntelliJ. For example, ^R in Vim is 'redo', but in IntelliJ it's the shortcut for Run To decide which program interprets the keystroke, go to Preferences -> Other Settings -> Vim Emulation and choose which k...

RecyclerView will perform a relevant animation if any of the "notify" methods are used except for notifyDataSetChanged; this includes notifyItemChanged, notifyItemInserted, notifyItemMoved, notifyItemRemoved, etc. The adapter should extend this class instead of RecyclerView.Adapter. impo...

PriorityQueue is a data structure. Like SortedSet, PriorityQueue sorts also its elements based on their priorities. The elements, which have a higher priority, comes first. The type of the PriorityQueue should implement comparable or comparator interface, whose methods decides the priorities of the ...

Uniform grid will place all it's children in a grid layout, each child in it's own cell. All the cells will have the same size. It can be thought to be a shorthand to a grid where all the row and column definitions are set to * Default rows and columns By default the UniformGrid will try to crea...

The following code makes the UI unresponsive for a short while after the button click, since too many Platform.runLater calls are used. (Try scrolling the ListView immediately after the button click.) @Override public void start(Stage primaryStage) { ObservableList<Integer> data = FXCol...

Specific for <li> tags within an unordered list (<ul>): list-style: disc; /* A filled circle (default) */ list-style: circle; /* A hollow circle */ list-style: square; /* A filled square */ list-style: '-'; /* any string */ ...

If you plan to host your Django website on Heroku, you can start your project using the Heroku Django Starter Template : django-admin.py startproject --template=https://github.com/heroku/heroku-django-template/archive/master.zip --name=Procfile YourProjectName It has Production-ready configurati...

SELECT Name FROM User WHERE IsActive = true This will return the name of all active Users. SELECT Name, Phone FROM Contact WHERE CreatedDate >= 2016-01-01T00:00:00.000Z This will return Contacts created on or after January 1st, 2016. SELECT Id, Name FROM Account LIMIT 100 This will ret...

SELECT Id, Name FROM User ORDER BY LastName SELECT Id, Name FROM Contact ORDER BY LastModifiedDate DESC SELECT Name, Title FROM User ORDER BY Title ASC NULLS FIRST SELECT Id FROM Contact ORDER BY LastName ASC NULLS LAST, FirstName ASC NULLS FIRST

It is a common operation to need to perform a particular function over each element in a parameter pack. With C++11, the best we can do is: template <class... Ts> void print_all(std::ostream& os, Ts const&... args) { using expander = int[]; (void)expander{0, (void(...

Android 6 (API23) introduced Doze mode which interferes with AlarmManager. It uses certain maintenance windows to handle alarms, so even if you used setExactAndAllowWhileIdle() you cannot make sure that your alarm fires at the desired point of time. You can turn this behavior off for your app using...

HVFL is a language designed to constrain UI elements in a simple and quick fashion. Generally, VFL has an advantage over traditional UI customization in the Interface Builder because it's much more readable, accessible and compact. Here's an example of VFL, in which three UIViews are constrained f...

After defining an enum using any of the above ways and setting a variable, you can print both the variable's value as well as the corresponding name from the enum for the value. Here's an example: // Define the enum var ColorsEnum = { WHITE: 0, GRAY: 1, BLACK: 2 } Object.freeze(ColorsEnum); // D...

A lot of the value from local JVM unit tests comes from the way you design your application. You have to design it in such a way where you can decouple your business logic from your Android Components. Here is an example of such a way using the Model-View-Presenter pattern. Lets practice this out by...