Compile All Java Files using Command Line

The compilation errors you're seeing are due to the Java compiler being unable to locate the subpackages and classes within your view package. It appears that there are several subdirectories under view which contain additional Java files (BoatMenu, ReservationMenu, UsersMenu), and these were not included in your compilation command. This situation can be resolved by ensuring all necessary Java files are compiled together.

Step-by-Step Solution

1. Verify Directory Structure: First, ensure that your project directory structure includes the subdirectories under view, as your imports suggest. It should look something like this:

   ProjectRoot/
   ├── src/
   │   ├── main/
   │   │   ├── java/
   │   │   │   ├── Main.java
   │   │   │   ├── controller/
   │   │   │   ├── model/
   │   │   │   ├── view/
   │   │   │   │   ├── MainMenu.java
   │   │   │   │   ├── boat/
   │   │   │   │   │   └── BoatMenu.java
   │   │   │   │   ├── reservation/
   │   │   │   │   │   └── ReservationMenu.java
   │   │   │   │   ├── users/
   │   │   │   │   │   └── UsersMenu.java
   

2. Compile All Java Files: Given that you have subpackages within the view package, you must ensure all these directories are included in your compilation command. Here’s how you can compile all Java files across all subdirectories from the command line:

   javac src/main/java/*.java src/main/java/controller/*.java src/main/java/model/*.java src/main/java/view/*.java src/main/java/view/boat/*.java src/main/java/view/reservation/*.java src/main/java/view/users/*.java
   

   This command includes every Java file within your main/java directory and its subdirectories. Adjust the paths if you have additional subdirectories.

3. Use Wildcards for Convenience: If you are using a Unix-like operating system (Linux, macOS), you can use the wildcard ** to simplify the command and include all Java files under a directory recursively:

   javac src/main/java/**/*.java
   

   Note: This wildcard does not work in Windows Command Prompt and might require Bash shell like Git Bash, or you'll have to specify each directory as done in the previous step.

4. Ensure Correct Imports and Package Declarations: Double-check that all your Java files have correct package declarations that match their directory structure, and that your import statements are accurate. This is crucial for the compiler to correctly link the classes.

5. Re-run Your Compilation Command: After ensuring all paths are correct and all necessary files are included, re-run your compilation command.

6. Running Your Program: After successful compilation, ensure the classpath is correctly set when running your program, particularly if your classes depend on external libraries or resources.

   java -cp src/main/java Main
   

This approach should resolve the compilation errors due to missing classes and subpackage issues. Be sure to maintain a consistent and organized directory structure to avoid such issues in the future, and always compile from the project root to maintain relative path integrity.