Java Inner Classes
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Questions and Answers

What is a potential advantage of making an inner class private?

  • It allows the outer class to hide its members from other classes (correct)
  • It makes the class accessible to all other classes in the program
  • It makes the inner class inaccessible to the outer class
  • It increases the memory usage of the program

Why might you not want to create an inner class?

  • Because it is not a commonly used design pattern
  • Because it can only be used in the class in which it is defined (correct)
  • Because it reduces code readability
  • Because it is not accessible to other classes

What is a characteristic of an inner class in Java?

  • It cannot be used as a data type
  • It can only access public members of its outer class
  • It can access private members of its outer class (correct)
  • It must be declared outside a method

What is the purpose of using enums in Java?

<p>To make the values type-safe (D)</p> Signup and view all the answers

Why might you want to define a class as a separate file instead of as an inner class?

<p>To make it more accessible to other classes (B)</p> Signup and view all the answers

What is the output of the given Java program?

<p>Price of pizza is 602.00 (C)</p> Signup and view all the answers

What is true about the relationship between an inner class and its outer class?

<p>The inner class can access all members of the outer class (C)</p> Signup and view all the answers

What is a characteristic of a non-static member class in Java?

<p>It requires an instance and has access to all data and methods of the top-level class (A)</p> Signup and view all the answers

What is a common scenario where you might encounter inner classes?

<p>In Java built-in classes (A)</p> Signup and view all the answers

How many types of nested classes are there in Java?

<p>4 (B)</p> Signup and view all the answers

What is the advantage of using enumerations to control a switch structure?

<p>It makes the values type-safe (B)</p> Signup and view all the answers

What is the name of the top-level class in a nested class structure?

<p>Top-level class (B)</p> Signup and view all the answers

What is the primary reason for nesting a class inside another?

<p>To make the connection between classes easier to understand (D)</p> Signup and view all the answers

What is the access modifier of the inner class HouseData?

<p>private (C)</p> Signup and view all the answers

What is the purpose of the display() method in the RealEstateListing class?

<p>To print the details of the real estate listing (C)</p> Signup and view all the answers

What data type is used to store the price of the real estate listing?

<p>double (A)</p> Signup and view all the answers

How many parameters does the constructor of the RealEstateListing class take?

<p>4 (C)</p> Signup and view all the answers

What is the purpose of the HouseData class?

<p>To store the address and area of the house (C)</p> Signup and view all the answers

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