Question 1

What is the output of the following code?

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 5 
A) 2 
B) 3 
C) 4 
D) 5

Question 2

The method findLargest should return the largest of any number of double values.For example, the call findLargest (3.4, -2.6, 2.9) should return 3.4 and the call findLargest (9.2, 17.6, 3.4, -2.6, 2.9) should return 17.6.Partial code to do this is given below:

What code will complete this method?

Accepted Answer

A)   
B)   
C)   
D)   
A)   
B)   
C)   
D)

Question 3

Which code snippet calculates the sum of all the even elements in an array values?

Accepted Answer

A)   
B)   
C)   
D)   
A)   
B)   
C)   
D)

Question 4

Consider the following 2-dimensional array.Which expression gives the number of elements in the third row?

Accepted Answer

A) counts[2].size() 
B) counts.length[2] 
C) counts.length 
D) counts[2].length 
A) counts[2].size() 
B) counts.length[2] 
C) counts.length 
D) counts[2].length

Question 5

Consider the following code snippet:   What is the output of the given code snippet on execution?

Accepted Answer

A) 5 
B) 6 
C) 7 
D) 9 
A) 5 
B) 6 
C) 7 
D) 9

Question 6

Which one of the following code snippets accepts the integer input in an array list named num1 and stores the even integers of num1 in another array list named evennum?

Accepted Answer

A)   
B)   
C)   
D)   
A)   
B)   
C)   
D)

Question 7

Select the statement that reveals the logic error in the following method.

Accepted Answer

A) double m = minimum(new double[] { 1.2, -3.5, 6.6, 2.4 }); 
B) double m = minimum(new double[] { 1.2, 23.5, 16.6, -23.4 }); 
C) double m = minimum(new double[] { -10.2, 3.5, 62.6, 21.4 }); 
D) double m = minimum(new double[] { 12.2, 31.5, 6.6, 2.4 }); 
A) double m = minimum(new double[] { 1.2, -3.5, 6.6, 2.4 }); 
B) double m = minimum(new double[] { 1.2, 23.5, 16.6, -23.4 }); 
C) double m = minimum(new double[] { -10.2, 3.5, 62.6, 21.4 }); 
D) double m = minimum(new double[] { 12.2, 31.5, 6.6, 2.4 });

Question 8

Which code snippet finds the largest value in an array that is only partially full?

Accepted Answer

A)   
B)   
C)   
D)   
A)   
B)   
C)   
D)

Question 9

Suppose you wish to write a method that returns the sum of the elements in partially filled array.Which is the best choice for a method header?

Accepted Answer

A) public int sum(int[] values) 
B) public int sum() 
C) public int sum(int[] values, int currSize) 
D) public int sum(int[] values, int size, int currSize) 
A) public int sum(int[] values) 
B) public int sum() 
C) public int sum(int[] values, int currSize) 
D) public int sum(int[] values, int size, int currSize)

Question 10

Which statement is true about the code snippet below?

Accepted Answer

A) The final size of names is 2; the final size of friends is 3. 
B) The final size of names is 3; the final size of friends is 2. 
C) The final size of names is 3; the final size of friends is 3. 
D) compilation error 
A) The final size of names is 2; the final size of friends is 3. 
B) The final size of names is 3; the final size of friends is 2. 
C) The final size of names is 3; the final size of friends is 3. 
D) compilation error

Question 11

When an array reading and storing input runs out of space

Accepted Answer

A) the program could be recompiled with a bigger size for the array. 
B) the array could be "grown" using the growArray method. 
C) it automatically resizes to accommodate new elements. 
D) the array could be "grown" using the new command and the copyOf method. 
A) the program could be recompiled with a bigger size for the array. 
B) the array could be "grown" using the growArray method. 
C) it automatically resizes to accommodate new elements. 
D) the array could be "grown" using the new command and the copyOf method.

Question 12

Which one of the following is a correct declaration for a method named passAList that has as arguments an array list myList of size 10 and an integer array intArr of size 20, and that modifies the contents of myList and intArr?

Accepted Answer

A) public void passAList(ArrayList myList(10), int[] intArr) B) public void passAList(ArrayList myList, int[20] intArr) C) public void passAList(ArrayList myList, int[] intArr) D) public void passAList(ArryaList myList, int intArr) A) public void passAList(ArrayList myList(10), int[] intArr) B) public void passAList(ArrayList myList, int[20] intArr) C) public void passAList(ArrayList myList, int[] intArr) D) public void passAList(ArryaList myList, int intArr)

Question 13

When a Java program terminates and reports an exception, the error message contains which pieces of useful information?
I.the compile and revision control history of the source code changes that caused the error
II.the name of the exception that occurred
III.the stack trace

Accepted Answer

A) I, II only 
B) I, III only 
C) II, III only 
D) I, II, III 
A) I, II only 
B) I, III only 
C) II, III only 
D) I, II, III

Question 14

Consider the following code snippet, where the array lists contain elements that are stored in ascending order:   Which one of the following descriptions is correct for the given code snippet?

Accepted Answer

A) The code snippet finds the highest value out of the two array lists. 
B) The code snippet finds the lowest value out of the two array lists. 
C) The code snippet compares the values of two array lists and stores the count of total matches found. 
D) The code snippet adds the values of the two array lists. 
A) The code snippet finds the highest value out of the two array lists. 
B) The code snippet finds the lowest value out of the two array lists. 
C) The code snippet compares the values of two array lists and stores the count of total matches found. 
D) The code snippet adds the values of the two array lists.

Question 15

If currLength is an integer variable that gives the number of elements currently in the array myArray, which code snippet prints out the elements in the partially filled array of integers?

Accepted Answer

A)   
B)   
C)   
D)   
A)   
B)   
C)   
D)

Question 16

The enhanced for loop is

Accepted Answer

A) convenient for traversing all elements in an array. 
B) convenient for traversing elements in a partially filled array. 
C) only used for arrays of integers. 
D) used to initialize all array elements to a common value. 
A) convenient for traversing all elements in an array. 
B) convenient for traversing elements in a partially filled array. 
C) only used for arrays of integers. 
D) used to initialize all array elements to a common value.

Question 17

What is the result of the following definition of an array list?
ArrayList<Double> points;

Accepted Answer

A) The statement causes a compile time error as the size of the array list is not defined. 
B) The statement creates an array list of size 0. 
C) The statement creates an array list with unlimited size. 
D) The statement defines an array list reference but does not create an array list. 
A) The statement causes a compile time error as the size of the array list is not defined. 
B) The statement creates an array list of size 0. 
C) The statement creates an array list with unlimited size. 
D) The statement defines an array list reference but does not create an array list.

Question 18

Which statement is true about the code snippet below?

Accepted Answer

A) The code adds all input numbers to the array list. 
B) The code has compile-time error. 
C) The array list is full after 100 numbers are entered. 
D) The code has a run-time error. 
A) The code adds all input numbers to the array list. 
B) The code has compile-time error. 
C) The array list is full after 100 numbers are entered. 
D) The code has a run-time error.

Question 19

Consider the following code snippet:   What is the size of the array list somedata after the given code snippet is executed?

Accepted Answer

A) 0 
B) 1 
C) 10 
D) 2 
A) 0 
B) 1 
C) 10 
D) 2

Question 20

This code snippet is an implementation of what algorithm?

Accepted Answer

A) removing an array element 
B) finding the maximum value in an array 
C) calculating the mean of values in an array 
D) sequential search 
A) removing an array element 
B) finding the maximum value in an array 
C) calculating the mean of values in an array 
D) sequential search

Exam 7: Arrays and Array Lists

What is the output of the following code?

The method findLargest should return the largest of any number of double values.For example, the call findLargest (3.4, -2.6, 2.9) should return 3.4 and the call findLargest (9.2, 17.6, 3.4, -2.6, 2.9) should return 17.6.Partial code to do this is given below: What code will complete this method?

Which code snippet calculates the sum of all the even elements in an array values?

Consider the following 2-dimensional array.Which expression gives the number of elements in the third row?

Consider the following code snippet: What is the output of the given code snippet on execution?

Which one of the following code snippets accepts the integer input in an array list named num1 and stores the even integers of num1 in another array list named evennum?

Select the statement that reveals the logic error in the following method.

Which code snippet finds the largest value in an array that is only partially full?

Suppose you wish to write a method that returns the sum of the elements in partially filled array.Which is the best choice for a method header?

Which statement is true about the code snippet below?

When an array reading and storing input runs out of space

Which one of the following is a correct declaration for a method named passAList that has as arguments an array list myList of size 10 and an integer array intArr of size 20, and that modifies the contents of myList and intArr?

When a Java program terminates and reports an exception, the error message contains which pieces of useful information? I.the compile and revision control history of the source code changes that caused the error II.the name of the exception that occurred III.the stack trace

Consider the following code snippet, where the array lists contain elements that are stored in ascending order: Which one of the following descriptions is correct for the given code snippet?

If currLength is an integer variable that gives the number of elements currently in the array myArray, which code snippet prints out the elements in the partially filled array of integers?

The enhanced for loop is

What is the result of the following definition of an array list? ArrayList<Double> points;

Which statement is true about the code snippet below?

Consider the following code snippet: What is the size of the array list somedata after the given code snippet is executed?

This code snippet is an implementation of what algorithm?

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