Multiple Choice Question

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Submitted by c-admin on Tue, 05/28/2019 - 04:23

QID:

132

Type:

Multiple Choice Question

Category:

Java Programmer I

Tags:

Operators and Scopes

Question:

Consider the following lines of code:

Integer i = new Integer(42);
Long ln = new Long(42);
Double d = new Double(42.0);

Which of the following options are valid?

Select 3 options

A. i == ln;
B. ln == d;
C. i.equals(d);
D. d.equals(ln);
E. ln.equals(42);

Answer and Explanation (Click to expand)

Answer:

C, D, E

Explanation:

The concept to understand here is as follows - If the compiler can figure out that something can NEVER happen, then it flags an error.

In this question, the compiler knows that ln, i or d can never point to the same object in any case because they are references to different classes of objects that have no relation ( superclass/subclass ) between themselves.

Q&A Set:

Set 12

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