49W Exam 2 PLTW

How many constructors does this Java class have?

• 4

• 8

• 2

• 0

What is the return type of Constructors?

• int

• void

• flow

• None of these

Order of execution of constructors in Java Inheritance is -

• Derived to base class

• Base to derived class

• Random order

• Void

In a Multi-Level Inheritance in Java, the last subclass inherits methods and properties of ______.

• All classes above it

• Few classes above it

• Only one immediate Superclass

• None of these

Class Cat extends Animal. Which is NOT a valid declaration?

• Cat x = new Cat();

• Cat x = new Animal();

• Animal X = new Animal();

• Animal x = new Cat();

Super keyword is used to access

• only subclass methods

• subclass variables and methods

• parent class variables and methods

• only parent class methods

Which among the following best describes encapsulation?

• a way of combining various data members and member functions that operate on those data members into a single unit

• integrating data (variables) and code (methods) into a single unit.

• a way of combining data and functions into paired units

• a way of combining codes and cats into units of lines and meows

What is subclass in java?

• A subclass is a class declared inside a class

• Superclass that is declared above a subset

• A subclass is a class that extends another class

• None of these

Which of the following statements correctly declares a two-dimensional integer array?

• int Matrix[ ] = new int[5,4];

• int Matrix[ ]; Matrix = new int[5,4];

• int Matrix[ ][ ] = new int[5][4];

• int Matrix[ ][ ] = int[5][4];

The following code segment, which is intended to print the page and chapter counts of a Document object, appears in a class other than Document.

Document d = new Document(245, 16);

System.out.println( /* missing code */ );

Which of the following can be used as a replacement for /* missing code */ so the code segment works as intended?

• d.toString()

• toString(d)

• d.pageCount

• d.pageCount(0)