Which statement about interfaces is RIGHT?

They can have default method implementations.

Have a look at the following code (picture), why is the code not correct?

Private fields variables are not allowed

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

protected: Accessable from subclass from different package.

Have a look at the following code (picture), why is the code not correct?

Abstract methods are not allowed in non-abstract-classes.

Regarding overloading and overriding which statement is correct?

Overloading: Methods with same name but different signatures

How to correctly define an ArrayList of Lions?

ArrayList lions = new ArrayList ();

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Fontys Venlo - Programming Concepts - week 12

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Questions 10

Answers

1
Which statement about interfaces is RIGHT?
They can be instantiated.
They can have default method implementations.
They cannot extend other interfaces
They can have field variables.
2
Which statement about abstract classes is RIGHT
They can be instantiated.
They cannot extend other abstract classes.
Cannot be used to define common behaviour.
They can have field variables.
3
Have a look at the following code (picture), why is the code not correct?
Private fields variables are not allowed
getLastname() method must be abstract.
Methods must have an implementation.
getFirstname() method mustnot be abstract
4
Regarding data and method visibility which statement about class/method modifier is incorrect?
private: Accessable from the same class
public: Accessable from a different package
protected: Accessable from subclass from different package.
default: Accessable from the same package
5
Which of the following can you instantiate with new?
Interfaces
All answers are correct
Abstract class
Concrete classes
6
Have a look at the following code (picture), why is the code not correct?
Abstract methods are not allowed in non-abstract-classes.
Fields and abstract methods must be used in interfaces.
Abstract methods are only allowed in interfaces.
Field "name" is not allowed when you have abstract methods.
7
Regarding overloading and overriding which statement is correct?
Overriding: Methods with same name but different signatures
Overriding: extend a subclass from a superclass
Overloading: new implementation for method in subclass
Overloading: Methods with same name but different signatures
8
How to correctly define an ArrayList of Lions?
Lion<> lions = new Lion<ArrayList>();
Lion<ArrayList> lions = new Lion<ArrayList>();
ArrayList<Lion> lions = new ArrayList<Lion>();
ArrayList<> lions = new ArrayList<>();
9
What is NOT a characteristic of inheritance?
Allows defining new classes from existing classes.
IS an HAS-A relationship
Avoids redundancy
Is an IS-A relationship
10
Which description is correct? (see picture)
4
2
1
3

Fontys Venlo - Programming Concepts - week 12 Flashcards | StudBud