Regarding overloading and overriding which statement is correct?

Overloading: Methods with same name but different signatures

Regarding primitive wrapper classes, which statement is NOT true?

They are the same as primitive types

How to correctly define an ArrayList of Lions?

ArrayList lions = new ArrayList ();

What is the class contract?

Signatures of all public methods and constants

Regarding data and method visibility which statement about class/method modifier is incorrect?

protected: Accessable from subclass from different package.

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Fontys Venlo - Programming Concepts - week 10

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Questions 10

Answers

1
Regarding overloading and overriding which statement is correct?
Overriding: extend a subclass from a superclass
Overloading: new implementation for method in subclass
Overloading: Methods with same name but different signatures
Overriding: Methods with same name but different signatures
2
What is the output of the following code? (see picture - ignore carriage return)
true true
false true
true false
false false
3
Regarding primitive wrapper classes, which statement is NOT true?
They are the same as primitive types
They can have convenient conversion methods
They can have constructors.
They can have constants.
4
How to correctly define an ArrayList of Lions?
Lion<ArrayList> lions = new Lion<ArrayList>();
ArrayList<Lion> lions = new ArrayList<Lion>();
ArrayList<> lions = new ArrayList<>();
Lion<> lions = new Lion<ArrayList>();
5
How to (re)use the second constructor correctly in the first constructor? (read code carefully)
new Sheep(defaultID, name);
Sheep.this(defaultId, "sheep1");
Sheep.Sheep(0, "sheep1");
this(defaultId, name);
6
What is NOT a characteristic of inheritance?
IS an HAS-A relationship
Avoids redundancy
Is an IS-A relationship
Allows defining new classes from existing classes.
7
Which conditions describe an immutable class? (see code) A class has...
... only private data fields.
no methods which can return a reference to a mutable field.
All answers are correct
... has no mutator methods for data fields.
8
What is the class contract?
Signatures of all private methods
Signatures of all public methods
Signatures of all private methods and constants
Signatures of all public methods and constants
9
Which description is correct? (see picture)
1
3
2
4
10
Regarding data and method visibility which statement about class/method modifier is incorrect?
private: Accessable from the same class
default: Accessable from the same package
public: Accessable from a different package
protected: Accessable from subclass from different package.

Fontys Venlo - Programming Concepts - week 10 Flashcards | StudBud