You'are <SPECIALITY> expert. You know about <AREA OF SPECIALITY>. Your task is to help USER find a <SUBJECT> strategy that gets their needs and goals. You will create a detailed easy to follow <SUBJECT> plan for the USER. Also make a accontability plan. <Be very helpful. Acknowledge this by answering "Yes" and stay idle>.
Java 14’s introduction of the record type has been a game-changer since it’s reducing boilerplate code to enhancing data immutability, records are a valuable addition to Java’s toolkit.
The example below demonstrates how record might replce the Lombok library.
class JEP_359_Records {
public static void main(String...args) {
System.out.println("Hello World");
var emp1 = new Employee("John", "Washington");
var emp2 = new Employee("John", "Washington");
//emp1.firstName = "Alex"; // ERROR: the properties are implicitly final.
// emp1.firstName("Alex"); // ERROR: the properties are implicitly final.
System.out.println(emp1); // toString(), output: Employee[firstName=John, lastName=Washington]
System.out.println(emp1.hashCode()); // hashCode()
System.out.println(emp2.hashCode()); // hashCode()
System.out.println(emp1.equals(emp2)); // equals(), output: true
var emp3 = new Employee(null, null);
System.out.println(emp3); // custom constructor sets Unknown
// we can create a custom static method building the class
var emp4 = Employee.unnamed("Washington");
System.out.println(emp4);
}
public record Employee(String firstName, String lastName) {
// firstName, lastName are final (immutable)
// Automatically generated constractor replaces @AllArgsConstructor
// It's not possible for some values to be mutable and some not
// Overriden constructors are not allowed
// Custom constructor is:
public Employee {
if (firstName == null) {
firstName = "Unknown";
}
if (lastName == null) {
lastName = "Unknown";
}
}
// Custom static method
public static Employee unnamed(String lastName) {
return new Employee("Unnamed", lastName);
}
}
}
When it comes to building responsive and dynamic Flutter apps, the FutureBuilder widget is an invaluable tool in a developer’s arsenal. In this blog post, we’ll explore how FutureBuilder simplifies handling asynchronous operations and elevates the user experience of your Flutter applications.
Understanding FutureBuilder
FutureBuilder is a widget in Flutter that lets you efficiently manage and display asynchronous data. It’s especially useful when dealing with operations like fetching data from APIs or performing time-consuming computations. FutureBuilder simplifies the process of showing loading spinners, error messages, and data when it becomes available.
How Does It Work?
FutureBuilder takes a Future and a builder function as parameters. The builder function is executed when the Future is complete, providing you with the data obtained from the async operation. In the meantime, you can show loading indicators or error messages, making your app more user-friendly.
Example Usage
Consider a scenario where you’re fetching data from a web API. You can use FutureBuilder to display a loading spinner while the data is being fetched and an error message if the operation fails. Once the data is available, you can display it beautifully in your app.
FutureBuilder(
future: fetchDataFromApi(),
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.waiting) {
return CircularProgressIndicator();
} else if (snapshot.hasError) {
return Text('Error: ${snapshot.error}');
} else {
return Text('Data: ${snapshot.data}');
}
},
)How do I learn Flutter? ? Which books are recommended for enhancing my expertise?
Here’s my bibliography for learning the Flutter framework.
Taking Flutter to the Web – This book serves as a definitive resource for those seeking to understand the correct approach to developing Flutter applications for the web platform. It delivers a comprehensive and structured body of knowledge encompassing the Flutter framework’s utilization for web development, covering key aspects such as web widgets, architectural considerations, and the distinctions between native and web application development.
Flutter Projects: A practical, project-based guide to building real-world cross-platform mobile applications and games – Many books cover programming languages, but this one stands out as a fantastic resource that showcases various projects and solutions for a range of tasks and approaches.”