Exam Practice Questions & Answers

Question 6

2007-04-16T02:50:00.000-07:00

Which will legally declare, construct and initialize an array?

A. int [] mylist = { "1", "2", "3"};
B. int [] mylist = (5, 8, 2);
C. int mylist [] [] = {4, 9, 7, 0};
D. int mylist [] = { 4, 3, 7};
E. int [] myList = [3, 5, 6];
F. int myList [] = {4; 6; 5};

Answer: D

The rest are wrong because

A: The array is of type int but the values assigned are String literals.
B: Curly braces should be used instead of ( ).
C: Provides initial values for one dimension, even though the array is two dimensional.
E: Curly braces should be used instead of [].
F. Commas should be used to seperate the values.

Question 5

2007-04-16T02:42:00.000-07:00

Consider the following lines of code:

int [] x = new int[25];

After execution, which statement or statements are true?

A. x[24] is 0.
B. x[24] is undefined.
C. x[25] is 0.
D. x[0] is null.
E. x.length is 25.

Answer : A, E

The array index is from 0 to 24. It has 25 elements which are all initialized to the default value of the data type of the array.

Question 4

2007-04-16T02:35:00.000-07:00

If all three top - level elements occur in one source file, they must appear in which order?

A. Imports, package declaration, classes

B. Classes, Imports, package declaration

C. Package declaration should come first; order for imports and class definitions is not
significant.

D. Package declaration, imports, classes

E. Imports must come first; order for package declaration and class definitions is not significant.

Answer: D

Question 3

2007-04-16T02:28:00.000-07:00

Which of the following signatures are valid for the main method entry point of the application?

A. public static void main()
B. public static void main(String arg[])
C. public void main(String [] arg)
D. public static void main(String [] args)
E. public static int main(String [] arg)

Answer: B, D

Question 2

2007-04-16T02:16:00.000-07:00

Choose valid identifiers from those listed below.

A.BigO1LongStringWithMeaninglessName
B.$Int
C.bytes
D.$1
E.finalist

Answer: A, B, C, D, E

An identifier must begin with a letter, a dollar sign ($) or an underscore; subsequent characters maybe letters, dollar signs, underscores or digits.

Question 1

2007-04-14T12:47:00.000-07:00

A signed data type has an equal number of non- zero positive and negative values available.

A. True

B. False

Answer : B

For each signed data type, the exponent of 2 in the minimum and maximum is one less than the size of the type.

Helpful Links to understand this question:

Java Primitive Data Types
This tutorial gives a comprehensive explanation about the 8 primitive data types in Java.