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Core Java - Interview Questions and Answers for 'Nested classes]' - 9 question(s) found - Order By Rating

 Q1. Why can we have a static inner class but not a static Top level class in Java ?Core Java
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   Like         Discuss         Correct / Improve     static class  inner classes   nested classes      Expert        rare

 Q2. 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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   Like         Discuss         Correct / Improve     inner classes   inner interface  nested classes

 Q3. 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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   Like         Discuss         Correct / Improve     private class   private inner class  class hiding  encapsulation  object oriented programming (oops)  oops concepts  inner classes   nested classes

 Q4. 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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   Like         Discuss         Correct / Improve     private class   inner classes  nested classes

 Q5. 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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   Like         Discuss         Correct / Improve     class files  compilation  compile  inner classes   nested classes

 Q6. 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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   Like         Discuss         Correct / Improve     inner classes  inner class in interface  nested classes

 Q7. What is a nested interface ?
Ans. Any interface declared inside a class or an interface. It is static by default.

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   Like         Discuss         Correct / Improve     java   oops   nested classes

 Q8. 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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   Like         Discuss         Correct / Improve     oops   java   static   nested classes   static nested classes
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 Q9. 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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   Like         Discuss         Correct / Improve     oops   java   static   nested classes   static nested classes
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