Question 1

To access the number of columns in row i of a two-dimensional array named grades, we would use which of the following?:

Accepted Answer

A)   grades.length
B)   grades[ i ].length
C)   grades( i ) .length
D)   grades( i ) .size
E)   grades{ i }.lengthF) C) and D)
G) A) and D)

Question 2

Why would you want to insert a comma between two array names in one statement?

Accepted Answer

A)   It allows you to instantiate multiple multidimensional arrays of the same data type.
B)   It allows you to declare multiple multidimensional arrays of different data types.
C)   It allows you to declare multiple multidimensional arrays of the same data type.
D)   It allows you to instantiate single arrays of the same data type.E) B) and D)
F) All of the above

Question 3

The ArrayList class belongs to which package?

Accepted Answer

A)   java.lang
B)   java.text
C)   java.util
D)   java.list
E)   java.arrayF) B) and E)
G) C) and E)

Question 4

Three-dimensional arrays are not allowed in Java.

Accepted Answer

A) True 
 B)False

Question 5

The syntax for declaring a multidimensional array requires the brackets to follow the array name.

Accepted Answer

A) True 
 B)False

Question 6

Theorize why the following code would generate compiler errors:
int [ ][ ] highTemps = new int [2][3];
highTemps = { { 89, 85, 98 },
{ 88, 90, 92 } };

Accepted Answer

The array has already been ins...

Question 7

Jessica wants to design a search engine for an online dictionary of software-related terms. Which class should she use?

Accepted Answer

A)   Array class
B)   Auto class
C)   ArrayList class
D)   Assign classE) None of the above
F) B) and C)

Question 8

How many empty sets of brackets are needed to declare an array?

Accepted Answer

A)   One
B)   Two
C)   At least two sets are needed
D)   It depends on how many dimensions are involvedE) B) and D)
F) A) and B)

Question 9

To process elements of a three-dimensional array, use a double for loop.

Accepted Answer

A) True 
 B)False

Question 10

To access the element at row i and column j of a two-dimensional array named grades, we would use which of the following?

Accepted Answer

A)   grades
B)   grades[ i ][ j ]
C)   grades[ j ][ i ]
D)   grades( i ) ( j ) 
E)   grades( j ) ( i ) F) All of the above
G) A) and E)

Question 11

When processing the elements of a two-dimensional array one row at a time, we should __________ the row processing variables before processing each row.

Accepted Answer

The answer of When processing the elements of a two-dimensional...

Question 12

When a multidimensional array is instantiated, elements of arrays with numeric types are initialized to null.

Accepted Answer

A) True 
 B)False

Question 13

Why can you not print the contents of an array using only the array name?

Accepted Answer

A)   Java does not support aggregate operations on multidimensional arrays.
B)   Java does not support aggregate operations on single-dimensional arrays.
C)   Each element in an array must be processed individually.
D)   All of these are correct.E) C) and D)
F) B) and D)

Question 14

Why is it a good idea to check that the current column number is less than arrayName[i].length before attempting to access arrayName[i][j]?

Accepted Answer

A)   Rows might have a different number of columns.
B)   Accessing columns that do not exist will result in ArrayIndexOutofBoundsException at run time.
C)   The column number must be within the range of 0 to arrayName[i].length - 1.
D)   All of these are correct.E) A) and D)
F) B) and C)

Question 15

To process all the elements of a two-dimensional array, we use a double loop.

Accepted Answer

A) True 
 B)False

Question 16

Compare the function of the following two statements:
arrayName.length
arrayName[i].length

Accepted Answer

The first syntax allows us to ...

Question 17

A method cannot return a two-dimensional array parameter.

Accepted Answer

A) True 
 B)False

Question 18

Simeon wants to keep track of his batting average for each day of each week of the next baseball season. Evaluate what is wrong with this code and recommend an alternative code.
double [ ] battingAverage;

Accepted Answer

We should use a two-dimensiona...

Question 19

The ArrayList class uses generics.

Accepted Answer

A) True 
 B)False

Question 20

Use add( E element ) in the ArrayList class to update a list of slang terms with additional terms.

Accepted Answer

A) True 
 B)False

Exam 9: Multidimensional Arrays and the Arraylist Class

To access the element at row i and column j of a two-dimensional array named grades, we would use which of the following?

Correct AnswerverifiedShow Answer

When processing the elements of a two-dimensional array one row at a time, we should __________ the row processing variables before processing each row.

Correct AnswerverifiedShow Answer

Three-dimensional arrays are not allowed in Java.

Correct AnswerverifiedShow Answer

How many empty sets of brackets are needed to declare an array?

Correct AnswerverifiedShow Answer

Use add( E element ) in the ArrayList class to update a list of slang terms with additional terms.

Correct AnswerverifiedShow Answer

The ArrayList class belongs to which package?

Correct AnswerverifiedShow Answer

To process all the elements of a two-dimensional array, we use a double loop.

Correct AnswerverifiedShow Answer

Why can you not print the contents of an array using only the array name?

Correct AnswerverifiedShow Answer

A method cannot return a two-dimensional array parameter.

Correct AnswerverifiedShow Answer

Theorize why the following code would generate compiler errors: int [ ][ ] highTemps = new int [2][3]; highTemps = { { 89, 85, 98 }, { 88, 90, 92 } };

Correct AnswerverifiedThe array has already been ins...View AnswerShow Answer

The syntax for declaring a multidimensional array requires the brackets to follow the array name.

Correct AnswerverifiedShow Answer

Simeon wants to keep track of his batting average for each day of each week of the next baseball season. Evaluate what is wrong with this code and recommend an alternative code. double [ ] battingAverage;

Correct AnswerverifiedWe should use a two-dimensiona...View AnswerShow Answer

Compare the function of the following two statements: arrayName.length arrayName[i].length

Correct AnswerverifiedThe first syntax allows us to ...View AnswerShow Answer

When a multidimensional array is instantiated, elements of arrays with numeric types are initialized to null.

Correct AnswerverifiedShow Answer

Jessica wants to design a search engine for an online dictionary of software-related terms. Which class should she use?

Correct AnswerverifiedShow Answer

To process elements of a three-dimensional array, use a double for loop.

Correct AnswerverifiedShow Answer

Why is it a good idea to check that the current column number is less than arrayName[i].length before attempting to access arrayName[i][j]?

Correct AnswerverifiedShow Answer

Why would you want to insert a comma between two array names in one statement?

Correct AnswerverifiedShow Answer

The ArrayList class uses generics.

Correct AnswerverifiedShow Answer

To access the number of columns in row i of a two-dimensional array named grades, we would use which of the following?:

Correct AnswerverifiedShow Answer

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The array has already been ins...
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We should use a two-dimensiona...
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The first syntax allows us to ...
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