This video provides an overview of several important features introduced in Java 21:
1. **Unnamed Classes**: In Java 21, you can create unnamed classes with just a single line of code without the need for a class declaration. This simplifies code and allows you to define methods like the main method directly.
2. **String Templates**: Java 21 introduces string templates, allowing you to embed expressions within strings using `${}` placeholders. This simplifies string formatting, especially when dealing with complex expressions.
3. **Sequence Collections**: Sequence collections are introduced to provide a unified way to access elements in collections like lists, sets, and queues. This simplifies the code by providing a consistent way to access elements irrespective of the collection type.
4. **Record Patterns**: Record classes introduced in Java 16 are further enhanced in Java 21. You can now access record class attributes directly without destructuring them explicitly.
5. **Pattern Matching for Switch Statements**: Java 21 improves switch statements, allowing you to use record classes as pattern elements in switch expressions.
6. **Virtual Threads**: Virtual threads are lightweight threads designed to simplify concurrency in Java applications. They are efficient and scalable, making it easier to work with multi-threaded applications.
These features aim to simplify coding in Java, enhance readability, and improve concurrency handling. Developers should familiarize themselves with these features for more efficient and cleaner Java code.
1. The speaker is discussing the upcoming release of Java 21, which is set to be a long-term support release [Source: Document(page_content="00:00:01.56: hello everyone once again Narendra here\n00:00:05.20: do you know Java become very easy now\n00:00:08.56: yes Java 21 going to be released in this\n00:00:13.00: month itself just another 9 days is\n00:00:17.08: remaining that is 19th September\n00:00:22.52: 2023 and you know post Java\n00:00:25.84: 17 Java 21 is\n00:00:28.96: the lest LTS release this Java 21 will\n00:00:34.04: be long-term support release this is a\n00:00:37.28: major release actually and around 15 new\n00:00:41.08: features they have added in this Java\n00:00:45.72: 21 out of\n00:00:48.12: 15 five six very important feature as a\n00:00:52.08: developer we should know it is really\n00:00:55.20: interesting let's discuss one by one\n00:00:58.48: with the example and and I'm very sure\n00:01:01.32: that if you are going through this\n00:01:03.44: session you will be understand\n00:01:05.04: conceptually what what are those new\n00:01:07.40: features and it will be helpful to crack\n00:01:10.16: any of the interview and you can use\n00:01:12.92: this in your project work as\n00:01:15.60: well and each six month nowadays Java\n00:01:19.44: getting\n00:01:20.72: release new release is\n00:01:23.68: coming okay so but this 21 is a\n00:01:28.08: long-term support release let's\n00:01:30.64: see so before you know like to write a\n00:01:35.76: simple program we need these four five\n00:01:37.76: lines of code right a Class A main\n00:01:40.68: method and write some lines if you want\n00:01:43.48: Hello World lines right so in Java 21 do\n00:01:46.80: you believe only like void men no need\n00:01:50.32: to pass any arguments nothing is there\n00:01:52.36: only write this hello word it will work\n00:01:54.80: let's see how it is working okay I will\n00:01:57.84: show you I'm using V S codor V BS editor\n00:02:02.04: visual studio uh editor okay you can you\n00:02:05.72: can uh download it like this any editor\n00:02:09.12: you can use\n00:02:10.76: actually open your any browser and just\n00:02:15.96: type vs code download okay Visual Studio\n00:02:19.48: code okay you click this I will I will\n00:02:22.40: provide this link Okay click here\n00:02:24.80: Windows I'm using this Windows u