Java 模块化设计：概念与实战应用

// module-info.java for com.example.logging
module com.example.logging {
    exports com.example.logging;
}

// module-info.java for com.example.data
module com.example.data {
    requires com.example.logging;
    exports com.example.data;
}

// module-info.java for com.example.application
module com.example.application {
    requires com.example.logging;
    requires com.example.data;
}

// Logging API in com.example.logging
package com.example.logging;
public class Logger {
    public void log(String message) {
        System.out.println("Log: " + message);
    }
}

// Data access in com.example.data
package com.example.data;
import com.example.logging.Logger;

public class DataManager {
    private Logger logger = new Logger();

    public void save(String data) {
        logger.log("Saving data: " + data);
    }
}

// Application entry in com.example.application
package com.example.application;
import com.example.data.DataManager;

public class App {
    public static void main(String[] args) {
        DataManager dataManager = new DataManager();
        dataManager.save("Hello, Modules!");
    }
}