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Core Java - Interview Questions and Answers for 'Access specifiers' - 12 question(s) found - Order By Newest

 Q1. What are points to consider in terms of access modifier when we are overriding any method?Core Java
Ans. 1. Overriding method can not be more restrictive than the overridden method.

reason : in case of polymorphism , at object creation jvm look for actual runtime object. jvm does not look for reference type and while calling methods it look for overridden method.

If by means subclass were allowed to change the access modifier on the overriding method, then suddenly at runtime when the JVM invokes the true objects version of the method rather than the reference types version then it will be problematic

2. In case of subclass and superclass define in different package, we can override only those method which have public or protected access.

3. We can not override any private method because private methods can not be inherited and if method can not be inherited then method can not be overridden.

  Sample Code for Overriding

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   Like         Discuss         Correct / Improve     java   overriding   access specifier   inheritence   oops   polymorphism  object oriented programming (oops)  oops concepts   runtime polymorphism  object oriented programming (oops)  oops concepts     Asked in 4 Companies
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  Q2. Difference between Public, Private, Default and Protected ?Core Java
Ans. Private - Not accessible outside object scope.

Public - Accessible from anywhere.

Default - Accessible from anywhere within same package.

Protected - Accessible from object and the sub class objects.

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   Like         Discuss         Correct / Improve     java   oop   access specifier   public   private   default   protected   public vs private vs default vs protected     Asked in 12 Companies      basic        frequent
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 Q3. Which access specifiers can be used with top level class ? a. public or default b. public or private c. public or protected d. protected or defaultCore Java
Ans. public or default

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   Like         Discuss         Correct / Improve     access specifier   oops   java   class     Asked in 2 Companies

 Q4. Which access specifier can be used with Class ?Core Java
Ans. For top level class we can only use "public" and "default". We can use private with inner class.

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   Like         Discuss         Correct / Improve     java   class   access specifier   inner classes      basic        frequent

 Q5. Can we reduce the visibility of the inherited or overridden method ?Core Java
Ans. No.

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   Like         Discuss         Correct / Improve     java   oops   access specifier   overriding   overridding   inheritence   yes-no

 Q6. Can we instantiate the object of derived class if parent constructor is protected ?Core Java
Ans. Yes, as protected constructor is accessible in sub class.

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   Like         Discuss         Correct / Improve     java   oops   constructor   access specifier   protected   yes-no  private constructor

 Q7. Can we declare an abstract method private ?
Ans. No Abstract methods can only be declared protected or public.

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   Like         Discuss         Correct / Improve     java   abstract   oops   access specifier   private   yes-no      intermediate        rare

 Q8. What access the variable gets if we don't provide any access specifier ?Core Java
Ans. It gets the default access i.e package protected.

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   Like         Discuss         Correct / Improve     access specifiers  default Access specifier      Basic

 Q9. Can we reduce the visibility of the overridden method ?Core Java
Ans. No

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   Like         Discuss         Correct / Improve     overriding   access specifier   oops   java   yes-no

 Q10. What will happen if we make the constructor private ?Core Java
Ans. We can't create the objects directly by invoking new operator.

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   Like         Discuss         Correct / Improve     java   oops   constructor   access specifier   private     Asked in 1 Companies      basic
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 Q11. Name few access and non access Class Modifiers ?
Ans. private , public and protected are access modifiers.

final and abstract are non access modifiers.

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   Like         Discuss         Correct / Improve     java   access specifiers   access modifiers   modifiers   access control

 Q12. What is the difference between public class and class ?Core Java
Ans. Class without any access specifier has the default scope i.e it can be accessed by any class within same package.

Class declared public can be accessed from anywhere.

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   Like         Discuss         Correct / Improve     java   access specifier   access modifiers   public class   class
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