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11.4. Parametrized Constructors for Declared Types Example
		For a declared type like the following:
	
		The compiler will implicitly generate 3 constructors: one without parameters, one with the @key fields and one with all fields.
	
Person() // parameterless constructor Person( String firstName, String lastName ) Person( String firstName, String lastName, int age )
Person() // parameterless constructor
Person( String firstName, String lastName )
Person( String firstName, String lastName, int age )