benhlal

public abstract sealed class Animal
permits Cat,Dog {....}
//
public class Cat extends Animal{...} //Complies fine
public class Dog extends Animal{...} //Complies fine
public class Lion extends Animal{...}//Compiler will complain

benhlal

// Your DTO
record Person (String firstName, String lastName, int age){}

//Usage in a TestClass (psvm)
var p = new Person('youness','ben',99);

benhlal

//Before
if (person instanceof Student) {
    Student student = (Student) person;
    student.subscribeToCourse();
}
//After 
if(obj instanceof Student student) student.subscribeToCourse();

benhlal

var mediaJSON = { "categories" : [ { "name" : "Movies",
        "videos" : [ 
		    { "description" : "Big Buck Bunny tells the story of a giant rabbit with a heart bigger than himself. When one sunny day three rodents rudely harass him, something snaps... and the rabbit ain't no bunny anymore! In the typical cartoon tradition he prepares the nasty rodents a comical revenge.\n\nLicensed under the Creative Commons Attribution license\nhttp://www.bigbuckbunny.org",
              "sources" : [ "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4" ],
              "subtitle" : "By Blender Foundation",
              "thumb" : "images/BigBuckBunny.jpg",
              "title" : "Big Buck Bunny"
            },
            { "description" : "The first Blender Open Movie from 2006",
              "sources" : [ "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ElephantsDream.mp4" ],