[TOC] ---------------------------------------------------------------------------------------------------- # Hello, world! The program is:

project1/hello_world.groovy

````groovy println "Hello world!" ```` The execution is: ````shell >groovy hello_world.groovy Hello world! ```` See [here](#running_by_java_runtime) to know how to compile a Java class file out of this Groovy script and to run it in Java runtime. ---------------------------------------------------------------------------------------------------- # Variables Also see [, [Semantics](https://groovy-lang.org/semantics.html)].

project1/variables.groovy

````groovy ```` ---------------------------------------------------------------------------------------------------- # Data types Also see [, [Object orientation](http://groovy-lang.org/objectorientation.html)]. ## Numbers

project1/data_types_numbers.groovy

````groovy ```` ````shell >groovy data_types_numbers.groovy > data_types_numbers_out.txt ```` The result is: ## Strings Also see: - [, [4. Strings](http://groovy-lang.org/syntax.html#all-strings)] - []

project1/data_types_strings.groovy

````groovy ```` ## Boolean Also see [, [The Groovy Truth]( https://docs.groovy-lang.org/latest/html/documentation/core-semantics.html#the-groovy-truth)]. Different value types may be converted to `boolean` when required.

project1/data_types_boolean.groovy

````groovy ```` ---------------------------------------------------------------------------------------------------- # Operators {#operators} Also see []: - [Operators](http://groovy-lang.org/operators.html) - [10. Operator overloading](http://groovy-lang.org/operators.html#Operator-Overloading)

project1/operators.groovy

````groovy ```` ---------------------------------------------------------------------------------------------------- # Control structures ## Conditionals Also see [, [1.3.1. Conditional structures]( http://groovy-lang.org/semantics.html#_conditional_structures)].

project1/conditionals.groovy

````groovy ```` ## Loops Also see [, [1.3.2. Looping structures]( http://groovy-lang.org/semantics.html#_looping_structures)].

project1/loops.groovy

````groovy ```` ## Exception handling Also see [, [1.3.3. Exception handling]( http://groovy-lang.org/semantics.html#_looping_structures)].

project1/exceptions.groovy

````groovy ````