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Java, one of the most popular programming languages worldwide, continues to evolve with each new version. With the release of Java 17, developers gain access to a range of new features and enhancements aimed at improving productivity, performance, and security. In this article, we'll delve into the latest features of Java 17, exploring what they offer and how developers can leverage them in their projects. Visit - <a href="https://www.sevenmentor.com/java-classes-in-ahmednagar">Java Classes in Ahmednagar</a>
Sealed Classes (JEP 409): Java 17 introduces sealed classes, a new language feature that allows developers to restrict the set of classes that can extend or implement a particular class or interface. Sealed classes offer improved control over class hierarchies, making code more maintainable and secure. By explicitly specifying which classes can extend a sealed class, developers can prevent unauthorized subclassing, reducing the risk of unintended behavior and vulnerabilities.
To declare a sealed class, use the "sealed" modifier followed by the permitted subclasses. Subclasses can be declared using the "non-sealed" modifier for classes with unrestricted subclassing or the "sealed" modifier for further constraining subclassing.
public sealed class Shape permits Circle, Rectangle, Triangle {
// Class definition
}
public final class Circle extends Shape {
// Class definition
}
public non-sealed class Rectangle extends Shape {
// Class definition
}
public non-sealed class Triangle extends Shape {
// Class definition
}
Pattern Matching for Switch (JEP 406): Pattern matching for switch expressions is another noteworthy addition in Java 17. This feature enhances the expressiveness and readability of switch statements by allowing developers to combine pattern matching with switch expressions. With pattern matching, switch expressions can now destructure and extract components from objects, facilitating concise and intuitive code. Visit - <a href="https://www.sevenmentor.com/java-classes-in-ahmednagar">Java Course in Ahmednagar</a>
Consider the following example where we use pattern matching to handle different shapes:
public double calculate area(Shape shape) {
return switch (shape) {
case Circle c -> Math.PI * c.getRadius() * c.getRadius();
case Rectangle r -> r.getLength() * r.getWidth();
case Triangle t -> 0.5 * t.getBase() * t.getHeight();
default -> throw new IllegalArgumentException("Unknown shape: " + shape);
