Modern programming languages often come with built-in web servers, and Java 18 is no exception. With Java 18, we can now easily start a web server using the jwebserver command. This server starts on localhost:8000 and provides a file browser for the current directory. This feature is particularly useful for quick prototyping and development purposes.
In previous versions of Java, the default charset used to depend on the host operating system and locale. However, in Java 18, the default charset is now set to UTF-8. This change ensures consistent behavior across different platforms and simplifies internationalization and localization of Java applications.
Java 18 introduces the ability to implement and integrate multiline code snippets. This feature proves invaluable when providing predefined examples or starter code for developers. By allowing the inclusion of code snippets directly in Java programs, developers can easily share reusable code segments and simplify the learning process for beginners.
4. Internet-Address Resolution SPI
The Internet-Address Resolution Service Provider Interface (SPI) in Java 18 facilitates the resolution of internet address items. This feature enables developers to resolve hostnames from IP addresses or retrieve hostnames and ports from an HTTP URI. By leveraging this SPI, developers can build robust networking applications that rely on address resolution.
5. Pattern Matching for Switch
Pattern Matching for switch was initially introduced in Java 17, and Java 18 further enhances this feature. With pattern matching for switch, developers can write concise and expressive code by enabling control flow transfer based on the value of a selector expression. This capability streamlines code readability and reduces the need for complex conditional statements, leading to more maintainable code.
The Vector API in Java 18 allows developers to manipulate arrays of numbers as a single entity. This feature proves highly beneficial for performing numeric computations, especially complex calculations involving multiple values. By treating arrays as vectors, developers can leverage the Vector API to achieve optimized performance and improve the efficiency of their numerical computations.
Java 18 introduces the concept of sealed classes, which allows developers to control the inheritance hierarchy of their classes. By declaring a class as sealed, you can restrict which classes can extend or implement it. This feature enhances encapsulation and helps prevent unauthorized subclasses, making your code more robust and secure.
8. Enhanced Pattern Matching
Building upon the pattern matching feature introduced in Java 17, Java 18 brings further enhancements to pattern matching. These enhancements include the introduction of new patterns, such as the type pattern, that allow for more expressive and concise code. Enhanced pattern matching simplifies the handling of complex data structures and improves the readability of your code.
Records are a new type of class introduced in Java 14, and Java 18 enhances this feature. Records provide a concise syntax for defining immutable data classes. With records, you can automatically generate constructors, accessors, equals(), hashCode(), and toString() methods, reducing boilerplate code and promoting immutability in your data models.
10. Unix-Domain Socket Channel
Java 18 introduces the Unix-Domain Socket Channel, which allows Java applications to communicate over Unix domain sockets. Unix domain sockets are a form of inter-process communication (IPC) mechanism provided by Unix-like operating systems. This feature enables Java applications to seamlessly integrate with existing Unix-based systems and interact with native processes.
11. Deprecating Serializability
Java 18 deprecates the Serializable interface and associated methods, discouraging the usage of Java Serialization as a means of object persistence. This change is driven by the security and performance concerns associated with Java Serialization. Developers are encouraged to use alternative serialization frameworks or adopt newer approaches like JSON or Protocol Buffers for object serialization.
Java 18 enhances the functionality of enums by introducing several new capabilities. Now, you can define methods within an enum and even implement interfaces, making enums more powerful and flexible. This enhancement enables you to write cleaner and more organized code when working with enumerated types.
These additional features further enhance the Java programming language, providing developers with more tools and capabilities to build robust and efficient applications.