Tutorial by Examples: f

import java.time.LocalTime; import java.time.ZoneId; import java.time.temporal.ChronoUnit; public class Test { public static void main(String[] args) { ZoneId zone1 = ZoneId.of("Europe/Berlin"); ZoneId zone2 = ZoneId.of("Brazil/East"); ...

The trick is to use a look-behind with the regex \G, which means "end of previous match": String[] parts = str.split("(?<=\\G.{8})"); The regex matches 8 characters after the end of the last match. Since in this case the match is zero-width, we could more simply say "...

Same as the known length example, but insert the length into regex: int length = 5; String[] parts = str.split("(?<=\\G.{" + length + "})");

For those of us using Maven as a build system, we can use the Maven Archetype to create a new application. First consult the maven archetype catalog mvn archetype:generate -DarchetypeCatalog=http://struts.apache.org/ you can use one of the following achetypes: The Blank Convention Archetype (s...

Suppose you have a DataFrame of numerical values, for example: df = pd.DataFrame(np.random.randn(1000, 3), columns=['a', 'b', 'c']) Then >>> df.corr() a b c a 1.000000 0.018602 0.038098 b 0.018602 1.000000 -0.014245 c 0.038098 -0.014245 1.000000...

Colored text can be created by passing the text and a font color name to the following function: private String getColoredSpanned(String text, String color) { String input = "<font color=" + color + ">" + text + "</font>"; return input; } The ...

Defining the base class: open class BaseClass { val x = 10 } Defining the derived class: class DerivedClass: BaseClass() { fun foo() { println("x is equal to " + x) } } Using the subclass: fun main(args: Array<String>) { val derivedClass = Deri...

Defining the base class: open class Person { fun jump() { println("Jumping...") } } Defining the derived class: class Ninja: Person() { fun sneak() { println("Sneaking around...") } } The Ninja has access to all of the methods in Pe...

One of the more annoying things that programmers can do is to scatter calls to printStackTrace() throughout their code. The problem is that the printStackTrace() is going to write the stacktrace to standard output. For an application that is intended for end-users who are not Java programmers,...

PostScript is a Turing-complete general programming language, designed and developed by Adobe Systems. Many of the ideas which blossomed in PostScript had been cultivated in projects for Xerox and Evans & Sutherland. Its main real-world application historically is as a page description language...

def hello_world(greeting: str = 'Hello'): print(greeting + ' world!') Note the spaces around the equal sign as opposed to how keyword arguments are usually styled.

CREATE TABLE menagerie.bird ( bird_id INT NOT NULL AUTO_INCREMENT, species VARCHAR(300) DEFAULT NULL COMMENT 'You can include genus, but never subspecies.', INDEX idx_species (species) COMMENT 'We must search on species often.', PRIMARY KEY (bird_id) ) ENGINE=InnoDB COMMENT 'Thi...

Bit-fields give an ability to declare structure fields that are smaller than the character width. Bit-fields are implemented with byte-level or word-level mask. The following example results in a structure of 8 bytes. struct C { short s; /* 2 bytes */ char c; /* 1 ...

Create example table Employee: CREATE TABLE Employee ( Id INT, EmpName VARCHAR(25), EmpGender VARCHAR(6), EmpDeptId INT ) Creates stored procedure that checks whether the values passed in stored procedure are not null or non empty and perform insert operation in Employee ta...

Uname is the short name for unix name. Just type uname in console to get information about your operating system. uname [OPTION] If no OPTION is specified, uname assumes the -s option. -a or --all - Prints all information, omitting -p and -i if the information is unknown. Example: > unam...

What's the deal with the following? julia> @test 0.1 + 0.2 == 0.3 Test Failed Expression: 0.1 + 0.2 == 0.3 Evaluated: 0.30000000000000004 == 0.3 ERROR: There was an error during testing in record(::Base.Test.FallbackTestSet, ::Base.Test.Fail) at ./test.jl:397 in do_test(::Base.Test....

Powershell allows multiple assignment of variables and treats almost everything like an array or list. This means that instead of doing something like this: $input = "foo.bar.baz" $parts = $input.Split(".") $foo = $parts[0] $bar = $parts[1] $baz = $parts[2] You can simply...

$env:COMPUTERNAME

A PowerShell profile is used to load user defined variables and functions automatically. PowerShell profiles are not automatically created for users. To create a PowerShell profile C:>New-Item -ItemType File $profile. If you are in ISE you can use the built in editor C:>psEdit $profile An ...

#requires -version 4 After trying to run this script in lower version, you will see this error message .\script.ps1 : The script 'script.ps1' cannot be run because it contained a "#requires" statement at line 1 for Windows PowerShell version 5.0. The version required by the script do...