What restrictions are placed on method overriding?

What restrictions are placed on method overriding?

Overridden methods must have the same name, argument list, and return type. The overriding method may not limit the access of the method it overrides. The overriding method may not throw any exceptions that may not be thrown by the overridden method.

What are the rules for overriding?

Rules for method overriding:

• In java, a method can only be written in Subclass, not in same class.
• The argument list should be exactly the same as that of the overridden method.
• The return type should be the same or a subtype of the return type declared in the original overridden method in the super class.

What is method overriding and what are the rules for method overriding?

When a method in a subclass has the same name, same parameters or signature, and same return type(or sub-type) as a method in its super-class, then the method in the subclass is said to override the method in the super-class. Method overriding is one of the way by which java achieve Run Time Polymorphism.

What are the two rules for overloading methods?

Two methods will be treated as overloaded if both follow the mandatory rules below: Both must have the same method name. Both must have different argument lists….Method Overloading Rules

• Have different return types.
• Have different access modifiers.
• Throw different checked or unchecked exceptions.

How can we implement method overloading?

2) Method Overloading: changing data type of arguments

1. class Adder{
2. static int add(int a, int b){return a+b;}
3. static double add(double a, double b){return a+b;}
4. }
5. class TestOverloading2{
6. public static void main(String[] args){
7. System.out.println(Adder.add(11,11));
8. System.out.println(Adder.add(12.3,12.6));

Is it possible to use both overloading and overriding in the same method?

Yes it is possible, you can overload and override a function in the same class but you would not be able to overload a function in two different classes as it is logically not possible.

Can you overload an overridden method?

You can overload the method as long as its signature is unique within the class, the base class is not considered. The reason nothing is printed is because in the overloaded method you are just returning the passed in value rather than printing it.

What are the rules on method overriding in Java?

Both methods must have same name, same parameters and, same return type else they both will be treated as different methods. The method in the child class must not have higher access restriction than the one in the super class. If you try to do so it raises a compile time exception.

When to use overriding in an object oriented language?

In any object-oriented programming language, Overriding is a feature that allows a subclass or child class to provide a specific implementation of a method that is already provided by one of its super-classes or parent classes. When a method in a subclass has the same name, same parameters or signature, and same return type (or sub-type) as a …

Can a private method be overridden in a subclass?

Private methods can not be overridden : Private methods cannot be overridden as they are bonded during compile time. Therefore we can’t even override private methods in a subclass. (See this for details).

When to use overriding and access modifiers in Java?

Overriding and Access-Modifiers : The access modifier for an overriding method can allow more, but not less, access than the overridden method. For example, a protected instance method in the super-class can be made public, but not private, in the subclass. Doing so, will generate compile-time error.