The difference between overloading and overriding

heavy load

The same method name , The number of formal parameters is different perhaps Parameter order is different perhaps Different parameter types are called method overloading

class animal{
    
    function cat(move string){
    //A 
        console.log(" Cats like "+move);
    }
    function cat(age int){
    //A 
        console.log(" Cat "+age+" year ");
    }
    function cat(move string,age int){
    //A 
        console.log(" Cats like "+move+", meanwhile "+age+" year ");
    }
}

rewrite

Rewrite the premise method : There must be inheritance
The method name is the same as the formal parameter list

class animal{
    
    function cat(move string){
     
        console.log(" Cats like "+move+", meanwhile 13 year ");
    }
}
class cat extends animal{
    
	function cat(move string){
     
		console.log(" Cats like "+move+", meanwhile 16 year ");
	}
}

Polymorphism is the same interface , Use different instances , Perform different operations

summary :

(1) Method overloading is ： Multiple methods with the same name are defined in a class , The number of parameters is different or the number is the same, but the type and order are different , It's called method overloading (Overloading).
(2) Method override is ： The name of the method that exists in the subclass is the same as that of the parent class , And the number of parameters is the same as the type , The return value is the same way , It's called rewriting (Overriding).
(3) Method overloading is a polymorphic representation of a class , Method rewriting is a kind of polymorphism between subclass and parent class .

Refer to the website ：https://www.runoob.com/java/java-override-overload.html

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