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A lot of example code posted on StackOverflow includes snippets like this: if ("A".equals(someString)) { // do something } This does "prevent" or "avoid" a possible NullPointerException in the case that someString is null. Furthermore, it is arguable that ...

- Without quotes: You can just split a long piece of text like this. - With quotes: "[But be careful: if you \"need\" punctuation, put double quotes around it. You can ev\ en split without spaces by using backslashes." - Or single quotes: 'This wor...

All programming languages allow us to assign values to variables. Usually, a value is assigned to variable, standing on left side. The prototype of the overall assignment operations in any contemporary programming language looks like this: left_operand assignment_operand right_operand instructions_...

// PixelAccessTutorial.cpp : Defines the entry point for the console // Environment: Visual studio 2015, Windows 10 // Assumptions: Opecv is installed configured in the visual studio project // Opencv version: OpenCV 3.1 #include "stdafx.h" #include<opencv2/core/core.hpp> #i...

It's also possible to use selectors together. This is done by using the OpenQA.Selenium.Support.PageObjects.ByChained object: element = driver.FindElement(new ByChained(By.TagName("input"), By.ClassName("class")); Any number of Bys can be chained and are used as an AND type ...

This class open a .gz file (usual format of compressed log files) and will return a line at each call of .NextLine() There is no memory usage for temporary decompression, very useful for large file. Imports System.IO Class logread_gz Private ptr As FileStream Private UnGZPtr As Compress...

Here is the JSON Structure we are going to use. { "employees": [ { "firstName": "John", "lastName": "Doe", "skills": [ { "name": "javascript", "rating&quo...

Detailed instructions on getting phonegap-build set up or installed.

<cfscript> oneDimensionArray = ArrayNew(1); oneDimensionArray[1] = 1; oneDimensionArray[2] = 'one'; oneDimensionArray[3] = '1'; </cfscript> <cfif IsDefined("oneDimensionArray")> <cfdump var="#oneDimensionArray#"> </cfif>...

Detailed instructions on getting retrofit set up or installed.

Though Go supports ++ and -- operators and the behaviour is found to be almost similar to c/c++, variables with such operators cannot be passed as argument to function. package main import ( "fmt" ) func abcd(a int, b int) { fmt.Println(a," &...

Sometimes there are sections of code that are difficult to test, such as accessing a database, or interacting with the user. You can stub out those sections of code, allowing the rest of the code to be tested. Let's start with a class that prompts the user. For simplicity, it has only two methods...

Go to the Microsoft link for the OpenXML SDK download. Click the red download button. On the next screen click the box next to OpenXMLSDKToolV25.msi and click next to begin the download. Once the download is complete, launch the OpenXMLSDKToolV25.msi and follow the instructions on the screen. Th...

To set up a default SceneKit project you can use the Game Template.

If you are inserting data into a table with an auto increment column and if you want to get the value of the auto increment column. Say you have a table called my_table: CREATE TABLE my_table ( id serial NOT NULL, -- serial data type is auto incrementing four-byte integer name character varying...

dblink EXTENSION is a technique to connect another database and make operation of this database so to do that you need: 1-Create a dblink extention: CREATE EXTENSION dblink; 2-Make your operation: For exemple Select some attribute from another table in another database: SELECT * FROM dblink...

Prerequisites JDK 1.7 or later installed. You can find the Oracle JDK's here. Steps Download Payara Server Full. Unzip the Payara Server at some location on your computer. We will use C:\payara41 as INSTALL_DIR for Windows users and /payara41 for Linux/Mac users. Starting / stopping Pa...

Let's understand something. JavaEE consists of a number of specifications. When you install an Application Server (Payara for example), you install all of the specifications at once. For example there's a specification for an ORM called JPA (Java Persistence API), a specification to build Component ...

REPL stands for 'Read Evaluate Print Loop.' The REPL can be used to write and execute code one line at a time and is an alternative to writing code to a file and then compiling or interpreting the entire file before execution. To start the SMLNJ REPL from a command prompt: smluser> sml Standar...

The %>% operator can also be used to pipe the dplyr output into ggplot. This creates a unified exploratory data analysis (EDA) pipeline that is easily customizable. This method is faster than doing the aggregations internally in ggplot and has the added benefit of avoiding unnecessary intermediat...