How Can the Command Pattern Refactor Nested Conditional Statements in Embedded Java Systems?

Refactoring Code with Nested Conditional Statements

Within Java system libraries designed for embedded devices, handling commands transmitted via radio broadcasts can lead to excessive use of if/else if statements. As the number of commands increases, this approach creates maintenance challenges and impairs code readability.

To address this issue, consider implementing the Command pattern. This design principle involves creating a Command interface outlining an exec() method. For each command, a specific class is created (e.g., CommandA) that implements the exec() method and encapsulates the command's logic.

Next, a Map is built to map command keys (e.g., "A" for CommandA) to their respective Command objects. Following this, the long chain of if/else if statements can be replaced with a single line:

commandMap.get(value).exec();

This approach effectively decouples the command handling logic from the conditional check, making the code more reusable and easier to manage. Additionally, special commands (e.g., UnknownCommand or NullCommand) can be added to handle unknown commands, reducing the need for excessive client-side checks.

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