Multiple Choice Question

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Submitted by c-admin on Tue, 05/28/2019 - 00:19

QID:

100

Type:

Multiple Choice Question

Category:

Java Programmer I

Tags:

Data Types and Variables

Question:

In which of these variable declarations, will the variable remain uninitialized unless explicitly initialized?

Select 1 option

A. Declaration of an instance variable of type int.
B. Declaration of a static class variable of type float.
C. Declaration of a local variable of type float.
D. Declaration of a static class variable of class Object
E. Declaration of an instance variable of class Object.

Answer and Explanation (Click to expand)

Answer:

Explanation:

We have to explicitly initialize local variables otherwise they remain uninitialized and it will be a compile time error if such variables are accessed without getting initialized.

Instance variables and static variables receive a default value if not explicitly initialized. All primitive types get a defaults value equivalent to 0. (eg. int to 0 and float to 0.0f etc) and boolean to false.

The type/class of a variable does not affect whether a variable is initialized or not.

Q&A Set:

Set 4

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