<\/p>\n\n\n\n
Upcasting:<\/strong> Now, think about how these animals are related. <\/p>\n\n\n\n Dogs and cats are animals, and rabbits are also animals. <\/p>\n\n\n\n In programming, upcasting is when you treat a more specialized object as if it were a more general object. <\/mark><\/p>\n\n\n\n You’re moving up the hierarchy. Just like how you can say “all dogs are animals,” in programming, you can say “all instances of a derived class are instances of the base class.”<\/p>\n\n\n\n For example, if you have classes You’re “upcasting” a Downcasting:<\/strong> You can’t directly call So, downcasting is the opposite of upcasting. It’s when you treat a more general object as if it were a more specialized object. You’re moving down the hierarchy.<\/mark><\/p>\n\n\n\n Continuing with our animals, if you have an Here, you’re “downcasting” the While upcasting and downcasting can be useful, it’s important to be careful. <\/p>\n\n\n\n If you try to downcast to a type that’s not actually what the object is, you might encounter runtime errors. <\/p>\n\n\n\n In the animal analogy, trying to treat a <\/p>\n\n\n\n <\/p>\n\n\n\n <\/p>\n","protected":false},"excerpt":{"rendered":" Upcasting:Imagine you have a group of animals: dogs, cats, and rabbits. Now, think about how these animals are related. Dogs and cats are animals, and rabbits are also animals. In programming, upcasting is when you treat a more specialized object as if it were a more general object. You’re moving up the hierarchy. Just like […]<\/p>\n","protected":false},"author":1,"featured_media":459,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[36,41,1,51,12],"tags":[],"_links":{"self":[{"href":"https:\/\/kop.lat\/blog\/wp-json\/wp\/v2\/posts\/450"}],"collection":[{"href":"https:\/\/kop.lat\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kop.lat\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kop.lat\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kop.lat\/blog\/wp-json\/wp\/v2\/comments?post=450"}],"version-history":[{"count":1,"href":"https:\/\/kop.lat\/blog\/wp-json\/wp\/v2\/posts\/450\/revisions"}],"predecessor-version":[{"id":451,"href":"https:\/\/kop.lat\/blog\/wp-json\/wp\/v2\/posts\/450\/revisions\/451"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kop.lat\/blog\/wp-json\/wp\/v2\/media\/459"}],"wp:attachment":[{"href":"https:\/\/kop.lat\/blog\/wp-json\/wp\/v2\/media?parent=450"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kop.lat\/blog\/wp-json\/wp\/v2\/categories?post=450"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kop.lat\/blog\/wp-json\/wp\/v2\/tags?post=450"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
Imagine you have a group of animals: dogs, cats, and rabbits. <\/p>\n\n\n\nAnimal<\/code>, Dog<\/code>, and Cat<\/code>, where Dog<\/code> and Cat<\/code> are derived from Animal<\/code>, upcasting would look like this:<\/p>\n\n\n\nAnimal dog = new Dog(); \/\/ Treating a Dog as an Animal<\/code><\/pre>\n\n\n\nDog<\/code> object to an Animal<\/code> reference, treating it as the more general base class.<\/p>\n\n\n\n
Now let’s say you have an Animal<\/code> object, but you know that it’s actually a Dog<\/code>. <\/p>\n\n\n\nbark()<\/code> on an Animal<\/code>, but you can call it on a Dog<\/code>. <\/p>\n\n\n\nAnimal<\/code> object but you know it’s a Dog<\/code>, you can do this:<\/p>\n\n\n\nAnimal animal = new Dog(); \/\/ Animal reference, but it's actually a Dog\nDog myDog = (Dog)animal; \/\/ Downcasting to treat the Animal as a Dog<\/code><\/pre>\n\n\n\nAnimal<\/code> reference to a Dog<\/code> reference so that you can access Dog<\/code>-specific behavior.<\/p>\n\n\n\nCat<\/code> as a Dog<\/code> could lead to some unexpected and confusing behavior.<\/p>\n\n\n\n