Suppose we have a system that needs to create different types of database connections, such as MySQL, Oracle, and PostgreSQL. We can use a factory pattern to create a database connection object without specifying the exact class of object that will be created.
public abstract class DatabaseConnection { public abstract void connect(); }
public class DatabaseConnectionFactory { public static DatabaseConnection createConnection(String databaseType) { if (databaseType.equals("mysql")) { return new MySQLConnection(); } else if (databaseType.equals("oracle")) { return new OracleConnection(); } else if (databaseType.equals("postgresql")) { return new PostgreSQLConnection(); } else { throw new UnsupportedOperationException("Unsupported database type"); } } }
Com.swfp.factory [ 2026 Edition ]
Suppose we have a system that needs to create different types of database connections, such as MySQL, Oracle, and PostgreSQL. We can use a factory pattern to create a database connection object without specifying the exact class of object that will be created.
public abstract class DatabaseConnection { public abstract void connect(); } com.swfp.factory
public class DatabaseConnectionFactory { public static DatabaseConnection createConnection(String databaseType) { if (databaseType.equals("mysql")) { return new MySQLConnection(); } else if (databaseType.equals("oracle")) { return new OracleConnection(); } else if (databaseType.equals("postgresql")) { return new PostgreSQLConnection(); } else { throw new UnsupportedOperationException("Unsupported database type"); } } } Suppose we have a system that needs to