Which statement, when inserted into line "// TODO code application logic here", is valid change?

Given:

public class SampleClass {
public static void main(String[] args) {
AnotherSampleClass asc = new AnotherSampleClass();
SampleClass sc = new SampleClass();
// TODO code application logic here
}
}

class AnotherSampleClass extends SampleClass {
}

Which statement, when inserted into line “// TODO code application logic here”, is valid change?

Given:

public class SampleClass {
public static void main(String[] args) {
AnotherSampleClass asc = new AnotherSampleClass();
SampleClass sc = new SampleClass();
// TODO code application logic here
}
}

class AnotherSampleClass extends SampleClass {
}

Which statement, when inserted into line “// TODO code application logic here”, is valid change?

A.
asc = sc;

B.
sc = asc;

C.
asc = (object) sc;

D.
asc = sc.clone ()

Explanation:
Works fine.
Incorrect answers:
asc = sc.clone();
Incompatible types.
asc =sc;
Incompatible types.
asc = (object) sc;
Syntax error

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Leave a Reply 5

Abed Abu Alhalawa

B

Fredy Jimenez Rendon

Why??

Hans

asc is-a sc.

Tommy

With inheritance, you can also refer to an object of a derived class using a variable
of a base class or interface.

James

The Answer is B. SampleClass (base class) cannot be converted or cast to AnotherSampleClass (derived class). Remember the order:

baseClassReference = derivedClassReference;

is allowed, but not vice versa:

derivedClassReference = baseClassReference; // won’t compile