Chapter 8: Arrays & ArrayLists

Given that String[ ] str has been initialized, to get a copy of str[0] with all characters converted to uppercase, use the following statement: a) str.uppercase( ); b) str[0].upperCase( ); c) str.toUpperCase( ); d) str[0].toUpperCase( );

D

When an array is passed to a method: a) reference to the array is passed b) it is passed just as an object c) the method has direct access to the original array d) all of the above

D

The last subscript in an array is always: a) 100 b) -1 c) 0 d) 1 less than the number of elements

D

What does the following statement do? double[ ] array1 = new double[10]; a) Declares array1 to be a reference to an array of double values b) Creates an instance of an array of 10 double values c) Will allow valid subscripts in the range of 0-9 d) All of the above

D

An array's size declaratory can be a negative number. True/False

False

Java does not allow a statement to use a subscript that is outside the range of valid subscripts for an array. True/False

False

When an array is passed to a method, the method has access only to a copy of the original array. True/False

False

An ArrayList automatically expands in size to accommodate the items saved in it. True/False

True

In an array declaration, this indicates the number of elements that the array will have: a) Subscript b) Size Declarator c) element sum d) reference variable

B

In order to do a binary search on an array: a) the values of the array must be numeric b) the array must first be sorted in ascending order c) you must first do a sequential search of the array to assure the element you are looking for is there d) there are no requirements

B

Java performs __________, which means that it does not allow a statement to use a subscript that is outside the range of valid subscripts for the array. a) active array sequencing b) array bounds checking c) scope resolution binding d) buffer overrun protection

B

The first subscript in an array is always: a) 1 b) 0 c) -1 d) 1 less than the number of the elements

B

This search algorithm steps through an array, comparing each item with the search value, starting at the beginning of the array: a) Binary search b) Sequential search c) Selection search d) iterative search

B

What will be the value of x[8] after the following code has been executed? final int SUB = 12; int[ ] x = new int[SUB]; int y = 100; for (int i = 0; i < SUB; i++) { x[i] = y; y += 10; } a) 170 b) 180 c) 190 d) 200

B

What would be the results after the following code was executed? int[ ] x = {23, 55, 83, 19}; int[ ] y = {36, 78, 12, 24}; x = y; y = x; a) x[ ] = {36, 78, 12, 24} and y[ ] = {23, 55, 83, 19} b) x[ ] = {36, 78, 12, 24} and y[ ] = {36, 78, 12, 24} c) x[ ] = {23, 55, 83, 19} and y[ ] = {23, 55, 83, 19} d) This is a compilation error.

B

Array bounds checking happens: a) When the program is compiled b) When the program is loaded into memory c) When the program is run d) When the program is saved

C

If final int SIZE = 15 and int[ ] x = new int[SIZE], what would be the range of subscript values that could be used with x[ ]? a) 1 through 15 b) 1 through 14 c) 0 through 14 d) 0 through 15

C

Each element of an array is accessed by a number known as a(n): a) Subscript b) Address c) address d) specifier

A

This search algorithm requires a sorted array: a) Binary search b) Sequential search c) Selection search d) iterative search

A

What do you call the number that is used as an index to pinpoint a specific element within an array? a) subscript b) global unique identifier c) element d) argument

A

The sequential search algorithm: a) requires the array to be ordered b) must always be implemented as a method c) uses a loop to sequentially step through an array, starting with the first element d) will not execute, if the element is not in the array

C

This array field holds the number of elements that the array contains: a) Size b) Elements c) length d) width

C

To insert an item at a specific location in an ArrayList object, you use this method: a) Store b) Insert c) add d) get

C

Both of these statements are legal and equivalent.: int [ ] numbers; int numbers [ ]; True/False

True

The Java compiler does not display an error message when it processes a statement that uses an invalid subscript. True/False

True

The subscript of the last element in a single-dimensional array is one less than the total number of elements in an array. True/False

True

The values in an initialization list are stored in the array in the order that they appear. True/False

True