GUI Creating Language (GCL) is a DSL (Domain Specific Language) for creating Graphical User Interfaces. It utilizes a simple language for creating forms with a set of widgets. Currently the GCL works with the Java Swing library. Basic assumptions of the GCL:

• works with ordinary Java classes. No specific inheritance or interfaces needed,
• in the simplest case the library creates the form automatically based on the passed data (Java) instance without specifying any additional parameters,
• wide customization possibilities using a dedicated syntax,
• it is also possible to create a form without a data instance (Ad Hoc GUIs),
• creates the following types of Swing controls:
• frames,
• internal frames,
• dialogs,
• panels.
• the controls allow editing and showing instances of the Java classes.
• all fields could be automatically validated,

Let’s start with some samples (emp, person, company are instances of typical Java classes describing business entities):

• A default frame showing automatically generated content for the given instance of the Person class:

// Both syntaxes are valid and yields to exactly the same result
JFrame frame1 =	create.
		frame.
		usingOnly(person);
			
JFrame frame2 =	create.
		frame.
		using(person).
		containing();			

• A customized frame showing automatically generated content for the given instance of the Person class:

JFrame frame =	create.
		frame.
		using(person).
		containing(
			attribute("firstName").as("First name"), 
			attribute("lastName").validate(new ValidatorNotEmpty()),
			attribute("higherEducation"),
			method("getAge").as("Age"));

• A default frame showing automatically generated content for the given instance of the Employee class (containing a complex type - Company):

frame =	create.
	frame.
	using(emp).
	containing(
		attribute("firstName").as("First name"), 
		attribute("lastName").validate(new ValidatorNotEmpty()),
		attribute("higherEducation"),
		attribute("company").as("Company").asComplex(	// nested (complex) object description
						attribute("name").as("Company name"),
						attribute("income").as("Company income")),									
		method("getAge").as("Age"));

A default frame showing automatically generated content for the given instance of the Company class (containing a multi-valued type - Employees):

JFrame frame =	create.
		frame.
		using(company).
		containing(
			attribute("name").as("Name"), 
			attribute("income"),
			attribute("employees"));

More samples could be found in the attached source code.