[WIP]Groovy Tutorial

Created: 2022/12/26

 My feeling at this moment is just someting like these emojis: 😂😎😌

Overview

 

Features of Groovy

Groovy has the following features −

• Support for both static and dynamic typing.
• Support for operator overloading.
• Native syntax for lists and associative arrays.
• Native support for regular expressions.
• Native support for various markup languages such as XML and HTML.
• Groovy is simple for Java developers since the syntax for Java and Groovy are very similar.
• You can use existing Java libraries.
• Groovy extends the java.lang.Object.

Environment

  

brew install groovy

 

 

Basic Syntax

Import Statement

By default, Groovy includes the following libraries in your code, so you don’t need to explicitly import them. 

import java.lang.* 
import java.util.* 
import java.io.* 
import java.net.* 

import groovy.lang.* 
import groovy.util.* 

import java.math.BigInteger 
import java.math.BigDecimal

 

 

Comment

  

// single line comment

/*
multiple lines comment
*/

 

 

Semicolons

 not mandatory

Identifiers 

Identifiers are used to define variables, functions or other user defined variables. Identifiers start with a letter,

a dollar or an underscore. They cannot start with a number. Here are some examples of valid identifiers 

Data Types

Built-in Data Types 

 

byte	This is used to represent a byte value. An example is 2.
short	This is used to represent a short number. An example is 10.
int	This is used to represent whole numbers. An example is 1234.
long	This is used to represent a long number. An example is 10000090.
float	This is used to represent 32-bit floating point numbers. An example is 12.34.
double	This is used to represent 64-bit floating point numbers which are longer decimal number representations which may be required at times. An example is 12.3456565.
char	This defines a single character literal. An example is ‘a’.
Boolean	This represents a Boolean value which can either be true or false.
String	These are text literals which are represented in the form of chain of characters. For example “Hello World”.

Class Numeric 

  

java.lang.Byte
java.lang.Short
java.lang.Integer
java.lang.Long
java.lang.Float
java.lang.Double

In addition, the following classes can be used for supporting arbitrary precision arithmetic

java.math.BigInteger
java.math.BigDecimal

 

 

Variables

Operators

Loops

Decision Making

Methods

File I/O

Optionals

Numbers

Strings

Ranges

Lists

Maps

Dates&Times

Regular Expressions

Exception Handling

Obeject Oriented

Generics

Traits

Closures

Annotations

XML

JMX

JSON

DSLS

Database

Builders

Commind Line

Unit Test

Template Engine

Meta Object Programming