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Method overriding in Java Program

Method overriding in Java Program:


 Method overriding in java -Declaring technique|a way|a technique} within the taxonomic category that already gifts within the parent category is understood as method overriding. Overriding is completed so a baby category will offer its own implementation to a technique that is already provided by the parent category. during this case, technique|the tactic|the strategy} within the parent category is termed the overridden methodology and therefore the methodology within the kid category is termed the overriding method.

Method overriding - In Java, once a category is heritable, you'll override the definition of any of its existing access strategies in its taxonomic category by a feature referred to as methodology overriding.

overridden strategies permit Java to support run-time polymorphism. Polymorphism is important to object-oriented programming for one reason: it permits a general category to specify strategies that may be common to all or any of its derivatives whereas permitting subclasses to outline the particular implementation of some or all of these strategies. Overridden strategies square measure in our own way that Java implements the “one interface, multiple methods” facet of polymorphism.

Part of the key to with success applying polymorphism is knowing that the superclasses and subclasses kind a hierarchy that moves from lesser to bigger specialization. Used properly, the taxon provides all components that a taxonomic category will use directly. It additionally defines those strategies that the derived category should implement on its own. this enables the taxonomic category the flexibleness to outline its own strategies, however still enforces a regular interface. Thus, by combining inheritance with overridden strategies, a taxon will outline the final type of the strategies that may be employed by all of its subclasses.

When a technique during a taxonomic category has a constant name, the same variety of arguments and therefore the same sort signature as a technique in its taxon, then technique|the tactic|the strategy} is understood because of the overridden method. methodology preponderant is additionally stated as run-time polymorphism. The key good thing about overriding is that the ability to outline a technique that is specific to a selected taxonomic category sort.

Method overriding happens once taxonomic category declares a technique that has a constant variety of arguments as a technique declared by one among its superclasses. The key good thing about overriding is that the ability to outline behavior that’s specific to a selected taxonomic category sort.

Note: The Overriding methodology cannot have a lot of restrictive access modifier than the strategy being overridden (Ex: You can’t override a technique marked public and create it protected).
You cannot override a technique marked final
You cannot override a technique marked static
Method overriding in Java Program:
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Function preponderant and overloading square measure kinds of polymorphism.
Polymorphism:
Poly: many, Morph: kind
By definition: Polymorphism is that the ability of AN object to requiring on several forms.

Overloading is once a constant methodology name is employed for two or a lot of strategies within the same category.

Here may be an easy example:


public category total come back a+b;
   }
   public void add(int a, int b, int c) come back a+b+c;
   }
}

For methodology overloading, the strategy signature (number of arguments, a variety of arguments and order of arguments) ought to diverge. The comeback sort isn't a neighborhood of the signature.

Overriding is once constant perform name from a base category is utilized in a derived category.
For example: take into account the class:

public category form one thing
   }
}

Consider category Circle that extends Shape:

public category Circle extends to form one thing completely different than category form
   }
}

In class Circle, if draw() methodology isn't created, then implementation from category form is used once we decision draw() on a derived category object.
But within the on top of the code, methodology draw() at school Circle overrides the implementation of sophistication form.
This is performed overriding.


Rules for method overriding:

The argument list ought to be precisely the same as that of the overridden methodology.

The comeback sort ought to be constant or a subtype of the comeback sort declared within the original overridden methodology within the taxon.

The access level cannot be a lot of restrictive than the overridden method's access level. For example: If the taxon methodology is asserted public then the preponderant methodology within the taxonomic category cannot be either personal or protected.

Instance strategies are overridden on condition that they're heritable by the taxonomic category.

A method declared final cannot be overridden.

A method declared static cannot be overridden however is re-declared.

If a technique cannot be heritable, then it can not be overridden.

A taxonomic category among constant package because the instance's taxon will override any taxon methodology that's not declared personal or final.

A taxonomic category during a completely different package will solely override the non-final strategies declared public or protected.

A Overriding methodology will throw any uncheck exceptions, no matter whether or not the overridden methodology throws exceptions or not. However, the preponderant methodology shouldn't throw checked exceptions that square measure new or broader than those declared by the overridden methodology. The preponderant methodology will throw narrower or fewer exceptions than the overridden methodology.

Constructors cannot be overridden.

example:-

class Shape
}

class Circle extends from
}

public category check {

 public static void main(String args[]) {
 form a = new Shaoe(); // object of form category
 form b = new Circle(); // form reference however Object of circle category

 a.print(); // o/p: form category
 b.print(); // o/p: Circle category
 }
}



Example:
One of the best example – Here Boy category extends Human category. each the categories have a typical methodology void eat(). Boy category is giving its own implementation to the eat() methodology or in alternative words it's preponderant the strategy eat().

class Human
}
class Boy extends Human

Method overriding in Java Program Method overriding in Java Program Reviewed by Raj Aryan on April 07, 2019 Rating: 5

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