Tutorial by Examples: g

PrinterJob pJ = PrinterJob.createPrinterJob(); if (pJ != null) { boolean success = pJ.showPrintDialog(primaryStage);// this is the important line if (success) { pJ.endJob(); } }

var person = new Person { Address = null; }; var city = person.Address.City; //throws a NullReferenceException var nullableCity = person.Address?.City; //returns the value of null This effect can be chained together: var person = new Person { Address = new Address { ...

You can use Scanner to read all of the text in the input as a String, by using \Z (entire input) as the delimiter. For example, this can be used to read all text in a text file in one line: String content = new Scanner(new File("filename")).useDelimiter("\\Z").next(); System.o...

You can use custom delimiters (regular expressions) with Scanner, with .useDelimiter(","), to determine how the input is read. This works similarly to String.split(...). For example, you can use Scanner to read from a list of comma separated values in a String: Scanner scanner = null; tr...

This is placed in a Windows Forms event handler var nameList = new BindingList<string>(); ComboBox1.DataSource = nameList; for(long i = 0; i < 10000; i++ ) { nameList.AddRange(new [] {"Alice", "Bob", "Carol" }); } This takes a long time to execute,...

Overview In this example 2 clients send information to each other through a server. One client sends the server a number which is relayed to the second client. The second client halves the number and sends it back to the first client through the server. The first client does the same. The server st...

Parentheses are now forbidden around named parameters. The following compiles in C#5, but not C#6 5.0 Console.WriteLine((value: 23)); Operands of is and as are no longer allowed to be method groups. The following compiles in C#5, but not C#6 5.0 var result = "".Any is byte; T...

The JavaScriptSerializer.Deserialize<T>(input) method attempts to deserialize a string of valid JSON into an object of the specified type <T>, using the default mappings natively supported by JavaScriptSerializer. using System.Collections; using System.Web.Script.Serialization; // ....

internal class Sequence{ public string Name; public List<int> Numbers; } // ... string rawJSON = "{\"Name\":\"Fibonacci Sequence\",\"Numbers\":[0, 1, 1, 2, 3, 5, 8, 13]}"; Sequence sequence = JsonConvert.DeserializeObject<Seque...

DOM stands for Document Object Model. It is an object-oriented representation of structured documents like XML and HTML. Setting the textContent property of an Element is one way to output text on a web page. For example, consider the following HTML tag: <p id="paragraph"></p&g...

Introduction All modern web browsers, NodeJs as well as almost every other JavaScript environments support writing messages to a console using a suite of logging methods. The most common of these methods is console.log(). In a browser environment, the console.log() function is predominantly used f...

var xhttp = new XMLHttpRequest(); xhttp.onreadystatechange = function () { if (xhttp.readyState === XMLHttpRequest.DONE && xhttp.status === 200) { //parse the response in xhttp.responseText; } }; xhttp.open("GET", "ajax_info.txt", true); xhttp.send(...

Python is a widely used high-level programming language for general-purpose programming, created by Guido van Rossum and first released in 1991. Python features a dynamic type system and automatic memory management and supports multiple programming paradigms, including object-oriented, imperative, f...

Generator expressions are very similar to list comprehensions. The main difference is that it does not create a full set of results at once; it creates a generator object which can then be iterated over. For instance, see the difference in the following code: # list comprehension [x**2 for x in r...

Django is a web development framework based on Python. Django 1.11 (the latest stable release) requires Python 2.7, 3.4, 3.5 or 3.6 to be installed. Assuming pip is available, installation is as simple as running the following command. Keep in mind, omitting the version as shown below will install t...

Write your code in a file named hello.swift: print("Hello, world!") To compile and run a script in one step, use swift from the terminal (in a directory where this file is located): To launch a terminal, press CTRL+ALT+T on Linux, or find it in Launchpad on macOS. To change dire...

Variables can be accessed via dynamic variable names. The name of a variable can be stored in another variable, allowing it to be accessed dynamically. Such variables are known as variable variables. To turn a variable into a variable variable, you put an extra $ put in front of your variable. $va...

The Increment operator (++) increments its operand by one. If used as a postfix, then it returns the value before incrementing. If used as a prefix, then it returns the value after incrementing. //postfix var a = 5, // 5 b = a++, // 5 c = a // 6 In this case, a is incr...

The decrement operator (--) decrements numbers by one. If used as a postfix to n, the operator returns the current n and then assigns the decremented the value. If used as a prefix to n, the operator assigns the decremented n and then returns the changed value. var a = 5, // 5 b = a...

All angles below are in radians. An angle r in radians has measure 180 * r / Math.PI in degrees. Sine Math.sin(r); This will return the sine of r, a value between -1 and 1. Math.asin(r); This will return the arcsine (the reverse of the sine) of r. Math.asinh(r) This will return the hype...