2023 update (#2)

.editorconfig

@@ -0,0 +1,11 @@
+# Declares that this is the top-level configuration
+root = true
+
+# Applies to all files
+[*]
+indent_style = space
+indent_size = 2
+
+# Applies to all Markdown files
+[*.md]
+trim_trailing_whitespace = false

.github/workflows/ci.yml

@@ -0,0 +1,23 @@
+name: Java CI
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up JDK 17
+        uses: actions/setup-java@v3
+        with:
+          java-version: '17'
+          distribution: 'temurin'
+      - name: Build exercise project with Maven
+        working-directory: ./alarmsystem
+        run:
+          mvn --batch-mode --update-snapshots package
+      - name: Build solution project with Maven
+        working-directory: ./solution
+        run:
+          mvn --batch-mode --update-snapshots package

README.md

@@ -1,35 +1,45 @@
-# S.O.L.I.D
+# S.O.L.I.D. object oriented design principles
 
 Learn about the SOLID principles of object oriented design.
 
 ## [Open presentation slides](https://docs.google.com/presentation/d/1zZ4W12I0JJXXA-QkILAA9_C6-sXe_H7grZxCDqWaYgs/)
 
 ## Focus of this lesson
+
 This lesson will focus on writing code that touches upon the various aspects of the SOLID principles.
 
 ## What you need
+
 - IntelliJ Community Edition: [IntelliJ Community Edition](https://www.jetbrains.com/idea/download/)
-- Java dev kit: [Java SE Development Kit](http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html)
+- Java dev kit (Java 17 or later): [Java SE Development Kit](https://docs.oracle.com/en/java/javase/19/install/overview-jdk-installation.html)
+- Alternative dev kit (Java 17 or later): [Eclipse Temurin Java Development Kit](https://adoptium.net/)
+
+## Prerequisites
+
+- Some previous experience with any object-oriented programming language is helpful
 
 ## How to get started
 
-* Start by cloning this repository into a folder on your computer. If you've never used git before, you can alternatively use the the "Download ZIP" button to the right.
-* Although you have this `README.md` file on your computer it's easier to read it on GitHub, so we recommend you keep this page open with the exercise tasks.
+- Start by cloning this repository into a folder on your computer. If you've never used git before, you can alternatively use the the "Download ZIP" button to the right.
+- Although you have this `README.md` file on your computer it's easier to read it on GitHub, so we recommend you keep this page open with the exercise tasks.
 
 ## Exercises
+
 This repository contains a set of exercises organized in markdown files. Each exercise builds on the previous.
 
-- [Exercises pt. 1](exercise1.md)
-- [Exercises pt. 2](exercise2.md)
-- [Exercises pt. 3](exercise3.md)
-- [Exercises pt. 4](exercise4.md)
+- [Exercise 1 - Introduction](./exercise-1/README.md) (Start here)
+- [Exercise 2 - Dependency Inversion Principle](./exercise-2/README.md)
+- [Exercise 3 - Single Responsibility Principle](./exercise-3/README.md)
+- [Exercise 4 - Interface Segregation Principle](./exercise-4/README.md)
+
+Tip: The markdown files are best viewed on [GitHub](https://github.com/nerdschoolbergen/solid) rather than on your computer.
+
+Have fun! And remember to ask an instructor if you're stuck.
 
 ## Helpful resources
+
 - [SOLID (object-oriented design) on Wikipedia](https://en.wikipedia.org/wiki/SOLID_(object-oriented_design))
-- [SOLID motivational posters](https://uppalaayush.wordpress.com/2015/09/14/solid-object-oriented-design-principles-summed-up-in-memes/)
-- [IntelliJ video tutorials](https://www.jetbrains.com/idea/documentation/)
-- [IntelliJ for Eclipse users](https://www.jetbrains.com/help/idea/2016.3/eclipse.html)
-- [IntelliJ testing](https://www.jetbrains.com/help/idea/2016.3/testing.html)
+- [IntelliJ documentation](https://www.jetbrains.com/idea/documentation/)
 
 ### Symbols and notation used in exercises
 

alarmsystem/.editorconfig

@@ -0,0 +1,284 @@
+# https://google.github.io/styleguide/javaguide.html
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = false
+max_line_length = 100
+ij_continuation_indent_size = 4
+ij_formatter_off_tag = @formatter:off
+ij_formatter_on_tag = @formatter:on
+ij_formatter_tags_enabled = false
+ij_smart_tabs = false
+ij_wrap_on_typing = false
+
+[*.conf]
+ij_continuation_indent_size = 2
+ij_hocon_keep_blank_lines_before_right_brace = 2
+ij_hocon_keep_indents_on_empty_lines = false
+ij_hocon_keep_line_breaks = true
+ij_hocon_space_after_colon = true
+ij_hocon_space_after_comma = true
+ij_hocon_space_before_colon = true
+ij_hocon_space_before_comma = false
+ij_hocon_spaces_within_braces = false
+ij_hocon_spaces_within_brackets = false
+ij_hocon_spaces_within_method_call_parentheses = false
+
+[*.java]
+ij_java_align_consecutive_assignments = false
+ij_java_align_consecutive_variable_declarations = false
+ij_java_align_group_field_declarations = false
+ij_java_align_multiline_annotation_parameters = false
+ij_java_align_multiline_array_initializer_expression = false
+ij_java_align_multiline_assignment = false
+ij_java_align_multiline_binary_operation = false
+ij_java_align_multiline_chained_methods = false
+ij_java_align_multiline_extends_list = false
+ij_java_align_multiline_for = false
+ij_java_align_multiline_method_parentheses = false
+ij_java_align_multiline_parameters = false
+ij_java_align_multiline_parameters_in_calls = false
+ij_java_align_multiline_parenthesized_expression = false
+ij_java_align_multiline_records = true
+ij_java_align_multiline_resources = false
+ij_java_align_multiline_ternary_operation = false
+ij_java_align_multiline_text_blocks = false
+ij_java_align_multiline_throws_list = false
+ij_java_align_subsequent_simple_methods = false
+ij_java_align_throws_keyword = false
+ij_java_annotation_parameter_wrap = off
+ij_java_array_initializer_new_line_after_left_brace = false
+ij_java_array_initializer_right_brace_on_new_line = false
+ij_java_array_initializer_wrap = normal
+ij_java_assert_statement_colon_on_next_line = false
+ij_java_assert_statement_wrap = off
+ij_java_assignment_wrap = off
+ij_java_binary_operation_sign_on_next_line = true
+ij_java_binary_operation_wrap = normal
+ij_java_blank_lines_after_anonymous_class_header = 0
+ij_java_blank_lines_after_class_header = 1
+ij_java_blank_lines_after_imports = 1
+ij_java_blank_lines_after_package = 1
+ij_java_blank_lines_around_class = 1
+ij_java_blank_lines_around_field = 0
+ij_java_blank_lines_around_field_in_interface = 0
+ij_java_blank_lines_around_initializer = 1
+ij_java_blank_lines_around_method = 1
+ij_java_blank_lines_around_method_in_interface = 1
+ij_java_blank_lines_before_class_end = 0
+ij_java_blank_lines_before_imports = 1
+ij_java_blank_lines_before_method_body = 0
+ij_java_blank_lines_before_package = 0
+ij_java_block_brace_style = end_of_line
+ij_java_block_comment_at_first_column = true
+ij_java_call_parameters_new_line_after_left_paren = false
+ij_java_call_parameters_right_paren_on_new_line = false
+ij_java_call_parameters_wrap = normal
+ij_java_case_statement_on_separate_line = true
+ij_java_catch_on_new_line = false
+ij_java_class_annotation_wrap = split_into_lines
+ij_java_class_brace_style = end_of_line
+ij_java_class_count_to_use_import_on_demand = 999
+ij_java_class_names_in_javadoc = 1
+ij_java_do_not_indent_top_level_class_members = false
+ij_java_do_not_wrap_after_single_annotation = false
+ij_java_do_while_brace_force = always
+ij_java_doc_add_blank_line_after_description = true
+ij_java_doc_add_blank_line_after_param_comments = false
+ij_java_doc_add_blank_line_after_return = false
+ij_java_doc_add_p_tag_on_empty_lines = false
+ij_java_doc_align_exception_comments = false
+ij_java_doc_align_param_comments = false
+ij_java_doc_do_not_wrap_if_one_line = false
+ij_java_doc_enable_formatting = true
+ij_java_doc_enable_leading_asterisks = true
+ij_java_doc_indent_on_continuation = false
+ij_java_doc_keep_empty_lines = true
+ij_java_doc_keep_empty_parameter_tag = false
+ij_java_doc_keep_empty_return_tag = false
+ij_java_doc_keep_empty_throws_tag = false
+ij_java_doc_keep_invalid_tags = true
+ij_java_doc_param_description_on_new_line = false
+ij_java_doc_preserve_line_breaks = false
+ij_java_doc_use_throws_not_exception_tag = true
+ij_java_else_on_new_line = false
+ij_java_enum_constants_wrap = off
+ij_java_extends_keyword_wrap = off
+ij_java_extends_list_wrap = normal
+ij_java_field_annotation_wrap = split_into_lines
+ij_java_finally_on_new_line = false
+ij_java_for_brace_force = always
+ij_java_for_statement_new_line_after_left_paren = false
+ij_java_for_statement_right_paren_on_new_line = false
+ij_java_for_statement_wrap = normal
+ij_java_generate_final_locals = false
+ij_java_generate_final_parameters = false
+ij_java_if_brace_force = always
+ij_java_imports_layout = $*, |, *
+ij_java_indent_case_from_switch = true
+ij_java_insert_inner_class_imports = true
+ij_java_insert_override_annotation = true
+ij_java_keep_blank_lines_before_right_brace = 2
+ij_java_keep_blank_lines_between_package_declaration_and_header = 2
+ij_java_keep_blank_lines_in_code = 1
+ij_java_keep_blank_lines_in_declarations = 2
+ij_java_keep_control_statement_in_one_line = false
+ij_java_keep_first_column_comment = true
+ij_java_keep_indents_on_empty_lines = false
+ij_java_keep_line_breaks = true
+ij_java_keep_multiple_expressions_in_one_line = false
+ij_java_keep_simple_blocks_in_one_line = false
+ij_java_keep_simple_classes_in_one_line = false
+ij_java_keep_simple_lambdas_in_one_line = false
+ij_java_keep_simple_methods_in_one_line = false
+ij_java_label_indent_absolute = false
+ij_java_label_indent_size = 0
+ij_java_lambda_brace_style = end_of_line
+ij_java_layout_static_imports_separately = true
+ij_java_line_comment_add_space = false
+ij_java_line_comment_at_first_column = true
+ij_java_method_annotation_wrap = split_into_lines
+ij_java_method_brace_style = end_of_line
+ij_java_method_call_chain_wrap = normal
+ij_java_method_parameters_new_line_after_left_paren = false
+ij_java_method_parameters_right_paren_on_new_line = false
+ij_java_method_parameters_wrap = normal
+ij_java_modifier_list_wrap = false
+ij_java_names_count_to_use_import_on_demand = 999
+ij_java_new_line_after_lparen_in_record_header = false
+ij_java_parameter_annotation_wrap = off
+ij_java_parentheses_expression_new_line_after_left_paren = false
+ij_java_parentheses_expression_right_paren_on_new_line = false
+ij_java_place_assignment_sign_on_next_line = false
+ij_java_prefer_longer_names = true
+ij_java_prefer_parameters_wrap = false
+ij_java_record_components_wrap = normal
+ij_java_repeat_synchronized = true
+ij_java_replace_instanceof_and_cast = false
+ij_java_replace_null_check = true
+ij_java_replace_sum_lambda_with_method_ref = true
+ij_java_resource_list_new_line_after_left_paren = false
+ij_java_resource_list_right_paren_on_new_line = false
+ij_java_resource_list_wrap = off
+ij_java_rparen_on_new_line_in_record_header = false
+ij_java_space_after_closing_angle_bracket_in_type_argument = false
+ij_java_space_after_colon = true
+ij_java_space_after_comma = true
+ij_java_space_after_comma_in_type_arguments = true
+ij_java_space_after_for_semicolon = true
+ij_java_space_after_quest = true
+ij_java_space_after_type_cast = true
+ij_java_space_before_annotation_array_initializer_left_brace = false
+ij_java_space_before_annotation_parameter_list = false
+ij_java_space_before_array_initializer_left_brace = false
+ij_java_space_before_catch_keyword = true
+ij_java_space_before_catch_left_brace = true
+ij_java_space_before_catch_parentheses = true
+ij_java_space_before_class_left_brace = true
+ij_java_space_before_colon = true
+ij_java_space_before_colon_in_foreach = true
+ij_java_space_before_comma = false
+ij_java_space_before_do_left_brace = true
+ij_java_space_before_else_keyword = true
+ij_java_space_before_else_left_brace = true
+ij_java_space_before_finally_keyword = true
+ij_java_space_before_finally_left_brace = true
+ij_java_space_before_for_left_brace = true
+ij_java_space_before_for_parentheses = true
+ij_java_space_before_for_semicolon = false
+ij_java_space_before_if_left_brace = true
+ij_java_space_before_if_parentheses = true
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+ij_java_space_before_method_parentheses = false
+ij_java_space_before_opening_angle_bracket_in_type_parameter = false
+ij_java_space_before_quest = true
+ij_java_space_before_switch_left_brace = true
+ij_java_space_before_switch_parentheses = true
+ij_java_space_before_synchronized_left_brace = true
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+ij_java_spaces_around_lambda_arrow = true
+ij_java_spaces_around_logical_operators = true
+ij_java_spaces_around_method_ref_dbl_colon = false
+ij_java_spaces_around_multiplicative_operators = true
+ij_java_spaces_around_relational_operators = true
+ij_java_spaces_around_shift_operators = true
+ij_java_spaces_around_type_bounds_in_type_parameters = true
+ij_java_spaces_around_unary_operator = false
+ij_java_spaces_within_angle_brackets = false
+ij_java_spaces_within_annotation_parentheses = false
+ij_java_spaces_within_array_initializer_braces = false
+ij_java_spaces_within_braces = false
+ij_java_spaces_within_brackets = false
+ij_java_spaces_within_cast_parentheses = false
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+ij_java_spaces_within_method_parentheses = false
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+ij_java_spaces_within_synchronized_parentheses = false
+ij_java_spaces_within_try_parentheses = false
+ij_java_spaces_within_while_parentheses = false
+ij_java_special_else_if_treatment = true
+ij_java_subclass_name_suffix = Impl
+ij_java_ternary_operation_signs_on_next_line = true
+ij_java_ternary_operation_wrap = normal
+ij_java_test_name_suffix = Test
+ij_java_throws_keyword_wrap = normal
+ij_java_throws_list_wrap = off
+ij_java_use_external_annotations = false
+ij_java_use_fq_class_names = false
+ij_java_use_relative_indents = false
+ij_java_use_single_class_imports = true
+ij_java_variable_annotation_wrap = off
+ij_java_visibility = public
+ij_java_while_brace_force = always
+ij_java_while_on_new_line = false
+ij_java_wrap_comments = true
+ij_java_wrap_first_method_in_call_chain = false
+ij_java_wrap_long_lines = false
+
+[*.properties]
+ij_properties_align_group_field_declarations = false
+ij_properties_keep_blank_lines = false
+ij_properties_key_value_delimiter = equals
+ij_properties_spaces_around_key_value_delimiter = false
+
+[{*.ant,*.fxml,*.jhm,*.jnlp,*.jrxml,*.jspx,*.pom,*.rng,*.tagx,*.tld,*.wsdl,*.xml,*.xsd,*.xsl,*.xslt,*.xul}]
+ij_continuation_indent_size = 2
+ij_xml_align_attributes = false
+ij_xml_align_text = false
+ij_xml_attribute_wrap = normal
+ij_xml_block_comment_at_first_column = true
+ij_xml_keep_blank_lines = 2
+ij_xml_keep_indents_on_empty_lines = false
+ij_xml_keep_line_breaks = true
+ij_xml_keep_line_breaks_in_text = true
+ij_xml_keep_whitespaces = false
+ij_xml_keep_whitespaces_around_cdata = preserve
+ij_xml_keep_whitespaces_inside_cdata = false
+ij_xml_line_comment_at_first_column = true
+ij_xml_space_after_tag_name = false
+ij_xml_space_around_equals_in_attribute = false
+ij_xml_space_inside_empty_tag = false
+ij_xml_text_wrap = normal
+ij_xml_use_custom_settings = true