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HomeJavajavaTutorialHow Can the Command Pattern Improve Code Maintainability and Simplify Command Handling in Java?

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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