MeanCoarse

Java Database Connectivity (JDBC) is a powerful API that allows Java programs to interact with databases, such as MySQL, Oracle, PostgreSQL, and more. Here’s an example of using JDBC to connect to a MySQL database:

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import java.sql.*; public class JdbcExample { public static void main(String[] args) { String url = "jdbc:mysql://localhost:3306/mydatabase"; String username = "root"; String password = "password"; try { Connection connection = DriverManager.getConnection(url, username, password); System.out.println("Connected to database."); Statement statement = connection.createStatement(); ResultSet resultSet = statement.executeQuery("SELECT * FROM users"); while (resultSet.next()) { String name = resultSet.getString("name"); int age = resultSet.getInt("age"); System.out.println("Name: " + name + ", Age: " + age); } connection.close(); } catch (SQLException e) { System.out.println("Database error: " + e.getMessage()); } } }

In this program, we establish a connection to a MySQL database using JDBC, execute a query to fetch data from the “users” table, and print the results.

Java Collections Framework: Managing Data Structures

The Java Collections Framework provides a set of classes and interfaces for working with data structures such as lists, sets, maps, and queues. Let’s see an example of using ArrayList, a dynamic array implementation:

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import java.util.ArrayList; public class ArrayListExample { public static void main(String[] args) { ArrayList<String> names = new ArrayList<>(); names.add("Alice"); names.add("Bob"); names.add("Charlie"); System.out.println("Names list: " + names); names.remove("Bob"); System.out.println("Updated names list: " + names); } }

In this program, we create an ArrayList called names, add elements to it, remove an element, and print the updated list.

Lambda Expressions: Concise Functionality

Lambda expressions in Java allow us to write more concise and expressive code, especially when working with functional interfaces. Here’s a simple example of using lambda expressions:

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import java.util.function.Consumer; public class LambdaExample { public static void main(String[] args) { Consumer<String> printMessage = message -> System.out.println("Message: " + message); printMessage.accept("Hello, Lambda!"); } }

In this program, we define a lambda expression message -> System.out.println("Message: " + message) that takes a string as input and prints it with a prefix.

JavaFX: Modern GUI Development

JavaFX is a modern UI toolkit for creating rich graphical user interfaces (GUIs) in Java applications. Here’s a simple JavaFX program that creates a basic window:

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import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.Label; import javafx.stage.Stage; public class JavaFxExample extends Application { @Override public void start(Stage primaryStage) { Label label = new Label("Hello, JavaFX!"); Scene scene = new Scene(label, 300, 200); primaryStage.setTitle("JavaFX Example"); primaryStage.setScene(scene); primaryStage.show(); } public static void main(String[] args) { launch(args); } }

In this program, we create a JavaFX window with a label displaying “Hello, JavaFX!” and show it to the user.

Conclusion: Keep Exploring Java’s Rich Ecosystem

Java is a versatile and robust programming language with a rich ecosystem of libraries, frameworks, and tools. From database connectivity to GUI development, Java offers endless possibilities for building powerful and scalable applications.

Continue exploring Java’s features, dive into advanced topics like concurrency, design patterns, and web development with Java EE, and don’t forget to stay updated with the latest developments in the Java world.

Happy coding, and may your Java journey be filled with learning, innovation, and success!