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Core Java - Interview Questions and Answers for 'Nested classe' - 15 question(s) found - Order By Newest

 Q1. Which of the following can be marked static ?

a. Methods , Variables and Initialization Blocks.
b. Methods , Variables , Initialization Blocks and Outer Classes and nested Classes.
c. Methods , Variables , Initialization Blocks and Outer Classes.
d. Methods , Variables , Initialization Blocks and nested Classes		Core Java
Ans. Methods , Variables , Initialization Blocks and nested Classes

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 Q2. What is the difference between inner class and sub class ?Core Java
Ans. Inner Class is a class that is nested within another class whereas sub class is a class that extends or inherit another class.

Inner class can only be accessed using reference of outer class ( Class name , if inner class is static or object reference, if inner class is non static ) whereas Sub class is accessed directly.

In terms of memory, inner class is stored just like another class having it's own body whereas sub class carries the body of parent class as well as it's own fields in memory.

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   Like         Discuss         Correct / Improve     inner classes  nested classes  inner class vs sub class  nested class vs sub class      Basic

 Q3. Difference between nested and inner classes ?
Ans. Inner class is a type of nested class.

Inner classes are non static nested classes i.e the one that are associated with the instance of outer class.

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 Q4. What is a nested interface ?
Ans. Any interface declared inside a class or an interface. It is static by default.

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 Q5. Which of the following cannot be marked static ?

a. Constructors , Classes ( Outer ) , Classes ( nested ), Interfaces , Local variables , Inner Class methods and instance variables.
b. Constructors , Classes ( Outer ) , Interfaces , Local variables , Class variables , Class Methods , Inner Class methods and instance variables.
c. Constructors , Classes ( Outer ) , Interfaces , Local variables , Inner Class methods and instance variables.
d. Constructors , Classes ( Outer ) , Classes (Nested), Interfaces , Local variables , Inner Class methods and instance variables
Ans. Constructors , Classes ( Outer ) , Interfaces , Local variables , Inner Class methods and instance variables.

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 Q6. What is the benefit of inner / nested classes ?Core Java
Ans. You can put related classes together as a single logical group.

Nested classes can access all class members of the enclosing class, which might be useful in certain cases.

Nested classes are sometimes useful for specific purposes. For example, anonymous inner classes are useful for writing simpler event-handling code with AWT/Swing.

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 Q7. Explain Static nested Classes ?
Ans. The accessibility (public, protected, etc.) of the static nested class is defined by the outer class.

A static nested class is not an inner class, it's a top-level nested class.

The name of the static nested class is expressed with OuterClassName.NestedClassName syntax.

When you define an inner nested class (or interface) inside an interface, the nested class is declared implicitly public and static.

Static nested classes can be declared abstract or final.

Static nested classes can extend another class or it can be used as a base class.

Static nested classes can have static members.

Static nested classes can access the members of the outer class (only static members, obviously).

The outer class can also access the members (even private members) of the nested class through an object of nested class. If you don't declare an instance of the nested class, the outer class cannot access nested class elements directly.

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 Q8. Can we have an inner class within Interface ?Core Java
Ans. Yes, we can define an inner class within interface.Inside the interface, the inner class is implicitly public static.

So the following is legit in Java

public interface BuggyBreadInterface {
   void doSomething();

   public class BuggyBreadClass implements BuggyBreadInterface{
      void doSomething(){
         System.out.println("Do something");
      }
   }
}

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 Q9. Upon compiling the following class, What .class files will get created

public class OuterClass{
class InnerClass{
}
}
Core Java
Ans. OuterClass.class AND OuterClass$InnerClass.class

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 Q10. Can we declare a class private ?Core Java
Ans. We can declare an inner class as private and hence would be restricting it's access from outside. We cannot make outer class as private.

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 Q11. How can we hide a class in Java ?Core Java
Ans. By encapsulating it within another class and declaring it private. In such a case, it will only be accessible through parent class or parent class object.

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 Q12. Can an inner class be subclass of it's parent class ?Core Java
Ans. Yes that can be done

public class OuterClass {
public class InnerClass extends OuterClass {
}
}

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 Q13. Is this code legal in java i.e nested class within interface implementing the parent interface ?

public interface MyInterface {
public class MyClass implements MyInterface {
}
}		Core Java
Ans. Yes that's legal in java

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 Q14. Can an interface be defined inside a class just like we can have inner classes inside a class ?Core Java
Ans. Yes , we can have an interface that is part of a class.

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 Q15. Why can we have a static inner class but not a static Top level class in Java ?Core Java
 This question is still unanswered. Can you please provide an answer.


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 Q16. Which of following can be nested into another ?Core Java
a. class within another class
b. class within interface
c. interface within class
d. All of above

Ans.d. All of above

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