What is the class contract?

Signatures of all public methods and constants

Regarding primitive wrapper classes, which statement is NOT true?

They are the same as primitive types

What does NOT correctly describe a class?

A class is a concrete real world object

Regarding static fields which statement is correct?

It is a part of the class, shared by all instances

Regarding visibility of accessors of variables, what is NOT correct?

private: can be seen by objects of other classes

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Fontys Venlo - Programming Concepts - week 8

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#fontys #fhtenl #prc1 #java #week8

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Questions 10

Answers

1
How do you correctly create an object of a Ninja class called Kai?
new Ninja = Kai("Ninja");
Kai ninja = new Kai()
Ninja kai = new Ninja("Kai")
Ninja n = Ninja.newInstance()
2
How to (re)use the second constructor correctly in the first constructor? (read code carefully)
Sheep.Sheep(0, "sheep1");
new Sheep(defaultID, name);
this(defaultId, name);
Sheep.this(defaultId, "sheep1");
3
What is the class contract?
Signatures of all private methods and constants
Signatures of all private methods
Signatures of all public methods
Signatures of all public methods and constants
4
Regarding primitive wrapper classes, which statement is NOT true?
They can have convenient conversion methods
They are the same as primitive types
They can have constructors.
They can have constants.
5
What does NOT correctly describe a class?
A class is a concrete real world object
A class is similar to a template
A class is a general concept of a real world object
A class is similar to a blueprint
6
What is the output of the following code? (see picture - ignore carriage return)
false true
true false
false false
true true
7
Regarding static fields which statement is correct?
Static fields can only be added to objects
It is a part of the class, shared by all instances
Has for each instance of a class a different value
It is part of an object, connected to an instance
8
Which conditions describe an immutable class? (see code) A class has...
... only private data fields.
All answers are correct
no methods which can return a reference to a mutable field.
... has no mutator methods for data fields.
9
Regarding visibility of accessors of variables, what is NOT correct?
private: can be seen by objects of other classes
public can be seen by whole world
private: accessible only by object of the same class.
public: cannot be seen by objects of other classes
10
How is the method called which is named exactly like the Class, here Ninja? (see picture)
Instance Method
public method
Garbage Collector
Constructor

Fontys Venlo - Programming Concepts - week 8 Flashcards | StudBud