Question

Which of the following is true about inheritance vs. composition? Group of answer choices inheritance uses...

Which of the following is true about inheritance vs. composition?

Group of answer choices

inheritance uses subclass/superclass relations; composition uses interface implementations

neither inheritance nor composition relies upon superclass/subclass relations

composition uses subclass/superclass relations; inheritance uses interface implementations

both inheritance and composition rely upon superclass/subclass relations

2.

Java performs compile-time type checking based on the __________ type of a variable.

Group of answer choices

immutable

actual

primitive

apparent

3.

What is a class called that represents the more general entity in an inheritance hierarchy?

Group of answer choices

interface

subclass

superclass

default class

4.

Which of the following statements about comparing objects is correct?

Group of answer choices

the equals() method is used to check whether two references are to the same object

the equals() method is used to compare the equivalency of two objects

for all immutable objects, the equals() method and the == operator always behave the same

the == operator is used to compare the equivalency of two objects

5.

All rodents are mammals, and all canines are mammals. No canines are rodents, and no rodents are canines. Which hierarchy best captures this information?

Group of answer choices

Mammal is a superclass of Rodent, and Mammal is a superclass of Canine

Mammal is a superclass of Rodent, and Rodent is a superclass of Canine

Rodent is a superclass of Mammal, and Canine is a superclass of Mammal

Mammal is a superclass of Canine, and Canine is a superclass of Rodent

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Homework Answers

Answer #1

Answer 1:
inheritance uses subclass/superclass relations; composition uses interface implementations
Answer 2:Actual type of variable
Answer 3:superclass
all common features are kept at parent class
Answer 4:the equals() method is used to compare the equivalency of two objects

Answer 5:
Mammal is a superclass of Rodent, and Mammal is a superclass of Canine

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