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in-action/class_rules.md

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+# Reminder And Class Rules
+
+## Reminder
+All students must participate in the first week of class or they will dropped from the course.
+
+Please complete the Week 1 assignment before the end of day Sunday.
+
+## Assignments and Schedule
+Due dates for assignments and discussions are stated in day numbers. 
+
+Day 1 is Monday, the first day of the beginning of each weekly session.

in-action/install_eclipse.md

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+# Eclipse Install
+
+## The First Eclipse Project
+
+The steps how to get 1st Eclipse project create and run.
+
+### Launch Eclipse
+
+1. Start Eclipse by running "eclipse.exe" in the Eclipse installed directory.
+2. Choose an appropriate directory for your workspace (i.e., where you would like to save your files).
+3. If the "Welcome" screen shows up, close it by clicking the "close" button.
+
+### Create a new Java Project
+
+For each Java application, you need to create a project to keep all the source files, classes and relevant resources.
+
+To create a new Java project:
+
+1. Choose "File" menu ⇒ "New" ⇒ "Java project".
+2. The "New Java Project" dialog pops up.
+   a. In the "Project name" field, enter "FirstProject".
+   b. Check "Use default location".
+   c. In the "JRE" box, select "Use default JRE (currently 'JDK1.x')". But check the JDK version, you should be using
+   JDK 1.5 and above.
+   d. Click "Finish".
+
+### Write a Hello-world Java Program
+
+1. In the "Package Explorer" (left panel) ⇒ Right-click on "FirstProject" (or use the "File" menu) ⇒ New ⇒ Class.
+2. The "New Java Class" dialog pops up.
+   a. In "Name" field, enter "Hello".
+   b. In "package" field, delete the content if it is not empty.
+   c. Check "public static void main(String[] args)" box.
+   d. Click "Finish".
+3. The source file "Hello.java" opens on the editor panel. Enter the following codes:
+
+```java
+public class HelloWorld {
+    public static void main(String[] args) {
+        System.out.println("Hello, world!");
+    }
+
+}
+```
+

in-action/install_jdk.md

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+# Java Install
+
+https://www.oracle.com/java/technologies/downloads/
+
+https://adoptium.net/temurin/releases/
+
+### JDK Version
+
+To configure project settings, select IntelliJ IDEA | Preferences on macOS or File | Settings on Windows and Linux from the main menu. 
+
+Alternatively, you can press Ctrl+Alt+S to show the IDE settings.
+
+![Eclipse-Temurin-JDK.png](_images/Eclipse-Temurin-JDK.png ':size=680')

in-action/naming_conventions.md

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+# Naming Conventions
+In simple terms, a naming convention refers to a framework used for naming your files in a specific way.
+
+## Classes
+Class names should be nouns, in mixed cases with the first letter of each internal word capitalized. Interfaces names should also be capitalized just like class names.
+
+## Methods
+Methods should be verbs, in mixed case with the first letter lowercase and with the first letter of each internal word capitalized.
+
+## Variables
+Variable names should not start with underscore _ or dollar sign $ characters, even though both are allowed.
+
+## Packages
+The prefix of a unique package name is always written in all-lowercase ASCII letters and should be one of the top-level domain names, like com, edu, gov, mil, net, org.