


How Can the Command Pattern Improve Code Maintainability and Simplify Command Handling in Java?
Reducing Long If-Statement Chains in Java
Question:
When managing incoming text commands in an embedded system, a long chain of if-else statements was used to handle each command. As the number of commands grew, this approach became unmanageable and difficult to debug.
Solution:
To address this issue, the Command pattern was employed. This pattern involves creating a separate class for each command, which implements a specific interface containing the exec() method. Then, a map is created to match command strings to their corresponding classes.
Java Implementation:
<code class="java">public interface Command { void exec(); } public class CommandA implements Command { @Override public void exec() { // ... } } // Other command classes Map<string command> commandMap = new HashMap(); // Populate the map commandMap.put("A", new CommandA()); commandMap.put("B", new CommandB()); // Execute the command commandMap.get(value).exec();</string></code>
Benefits:
- Separates logic for each command into a designated class, making code more modular and maintainable.
- Simplifies the main processing loop by replacing the if-else chain with a single map lookup.
- Allows for the addition of new commands or special commands (e.g., UnknownCommand) without modifying the main processing logic.
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