1. ?? ?? ??

?? ??? ???? ???? ?? ??? ? ???? Java ???? ?? ?????. ?? ??? ????? ? ?? ???? ?? ?? ??? ???? ? ?????. ?? ??? ???? ??? ???? ??? ??? ????? ????? ???? ? ??? ???.

1.1 ?? ???? ??????

?? ??? static ???? ?? ??? ???? ?????. ???? ?? ??? ? ? ? ???? ?? ??? ?????? ?? ??? ???? ? ?????.

?:

public class Config {
    static {
        System.out.println("Static block executed");
        // Initialize static resources here
    }

    public static void main(String[] args) {
        System.out.println("Main method executed");
    }
}

?? ?? ? ?? : ? ??? ???? ??? ?? ??? ?????.

Static block executed
Main method executed

?? ??? ?? ????? ?? ???? ??? ??? ?????.

1.2 ?? ??? ?? ??

?? ??? ????? ?? ??? ?????.

• ?? ??? ???? ????.
• ??? ???? ?? ??? ??????.
• ? ?? ???? ?? ??? ??? ?????.

?:

public class DatabaseConfig {
    private static Connection connection;

    static {
        try {
            // Simulate loading database configuration
            System.out.println("Loading database configuration...");
            connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "user", "password");
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public static Connection getConnection() {
        return connection;
    }
}

?? ?? ? ?? : ?? ??? DatabaseConfig ???? ?? ??? ? ?????? ??? ??????. ??? ?? ?? ??? ? ? ???? ?????? ???? ??????.

2. ?? ?? ?? ?? ??

?? ??? ??? ? ?? ??? ??? ????? ?? ?? ??? ???? ? ??? ???. ???? ? ? ?? ?? ??? ??? ????.

2.1 ??? ??? ????

?? ???? ??? ???? ??? ?? ??? ??? ?????? ? ???. ??? ?? ????? ???? ?????? ?? ??? ??? ? ? ????.

public class HeavyInitialization {
    static {
        // Avoid heavy computations here
        System.out.println("Heavy computation should be avoided in static blocks.");
    }
}

??? ??? ???? ?? ??? ????? ?????. ??? ??? ?? ???? ????? ?????? ???? ???.

2.2 ??? ???? ????

?? ??? ??? ?? ??? ???? ? ????. ??? ?? ? ??? ????? ??? ??? ???? ???? ?? ?????.

public class SafeConfig {
    static {
        try {
            // Example of safe exception handling
            System.out.println("Initializing resources...");
            throw new IOException("Failed to initialize resources");
        } catch (IOException e) {
            System.err.println("Exception in static block: " + e.getMessage());
        }
    }
}

?? ?? ??? ??? ???? ??? ??? ??? ???? ????. ??? ?? ???? ?? ??? ???? ???.

2.3 ??? ???

?? ??? ???? ???? ??????. ?? ??? ????? ??? ? ?? ??? ??????? ?? ??? ??? ???? ???.

public class Config {
    static {
        System.out.println("Static block executed");
        // Initialize static resources here
    }

    public static void main(String[] args) {
        System.out.println("Main method executed");
    }
}

?? ???? ?? ?? ??? ??? ??? ???? ???? ?? ???? ?? ?? ?? ???? ?????.

3. ??

?? ??? Java?? ?? ??? ????? ?? ??? ???? ?? ??? ?????. ??? ????, ??? ??? ????, ??? ???? ????, ???? ????? ?? ??? ??? ? ?? ??? ???? ?? Java ??? ???? ? ????.

?? ??? ?? ??? ??? ?? ??? ?????? ??? ???? ??? ?????!

?? ??? ??? ??: ?? ??? ???? Java ??? ????? ?? ?? ??

? ??? ?? ??? ???? Java ??? ????? ?? ?? ??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!