Question 1

A method that receives a two-dimensional array uses two ____________________ pairs following the data type in the parameter list of the method header.

Accepted Answer

The answer of A method that receives a two-dimensional array...

Question 2

You can think of the single dimension of a single dimensional array as the height of the array.

Accepted Answer

A) True 
 B)False

Question 3

You can add an item at any point in a(n) ____ container and the array size expands automatically to accommodate the new item.

Accepted Answer

A)  ArrayList 
B)  Array 
C)  ResizableArray 
D)  array

Question 4

import javax.swing.*; 
class FindPoints 
{ 
   public static void main(String[] args) 
   { 
      int[][] points = 
     {{10, 20, 30}, 
      {20, 40, 60}, 
      {40, 60, 80}}; 
      String prompt; 
      int class; 
      int level; 
      prompt = JOptionPane.showInputDialog(null, "Class: "); 
      class = Integer.parseInt(prompt); 
      prompt = JOptionPane.showInputDialog(null, "Level: "); 
      level = Integer.parseInt(prompt); 
      JOption.showMessageDialog(null, "Your points: " + points[class][level]); 
   } 
} 
The above code depicts a two-dimensional array named points that refers to a Class and Level to determine a point value. If a user inputs a Class of 1 and a Level of 2, what point value will be displayed when the program executes? Explain how you arrived at your answer.

Accepted Answer

The answer of import javax.swing.*; 
class FindPoints 
{ 
   public...

Question 5

int[][] myVals = {{2, 4, 6},  {1, 3, 5, 7}};
Using the above array, what is the value of myVals.length ?

Accepted Answer

A)  1 
B)  2 
C)  4 
D)  5

Question 6

The ArrayList class ____ method retrieves an item from a specified location in an ArrayList .

Accepted Answer

A)  extract 
B)  get 
C)  peek 
D)  retrieve

Question 7

import java.util.*; 
import javax.swing.*; 
public class binary_search 
{ 
    public static void main(String[] args) 
   { 
           int myNums[]={2, 44, 5, 66, 78, 90, 23, 66}; 
           int point, find = 78; 
           point = Arrays.binarySearch(myNums, find); 
           System.out.println("Element found at index " + point); 
   
    } 
} 
Using the above code, what output will be displayed when the program is executed? Describe how the binarySearch() method functions.

Accepted Answer

The answer of import java.util.*; 
import javax.swing.*; 
public class binary_search...

Question 8

The Arrays class ____________________ method assigns the specified value to each element of the specified array.

Accepted Answer

The answer of The Arrays class ____________________ method assigns the...

Question 9

When creating arrays, Java is limited in size due to limitations on the number of variables and subscripts used.

Accepted Answer

A) True 
 B)False

Question 10

When you place objects in order beginning with the object that has the lowest value, you are sorting in ____________________ order.

Accepted Answer

The answer of When you place objects in order beginning...

Question 11

public class EnumExample 
{ 
    enum Day {SUNDAY, MONDAY, TUESDAY, WEDNESDAY, 
              THURSDAY, FRIDAY, SATURDAY }; 
    Day day; 
    public EnumExample(Day day) 
    { 
        this.day = day; 
    } 
    public void giveFeedback() 
    { 
        switch (day) 
        { 
            case MONDAY: 
                System.out.println("Mondays are bad."); 
                break; 
            case FRIDAY: 
                System.out.println("Fridays are better."); 
                break; 
            case SATURDAY: case SUNDAY: 
                System.out.println("Weekends are best."); 
                break; 
            default: 
                System.out.println("Midweek days are so-so."); 
                break; 
        } 
     } 
    public static void main(String[] args) 
    { 
        EnumExample firstDay = new EnumExample(Day.MONDAY); 
        firstDay.giveFeedback(); 
        EnumExample thirdDay = new EnumExample(Day.WEDNESDAY); 
        thirdDay.giveFeedback(); 
        EnumExample fifthDay = new EnumExample(Day.FRIDAY); 
        fifthDay.giveFeedback(); 
        EnumExample sixthDay = new EnumExample(Day.SATURDAY); 
        sixthDay.giveFeedback(); 
        EnumExample seventhDay = new EnumExample(Day.SUNDAY); 
        seventhDay.giveFeedback(); 
    } 
} 
Using the above enumeration and code, what will be the output when the program is executed?

Accepted Answer

The answer of public class EnumExample 
{ 
    enum Day {SUNDAY,...

Question 12

import javax.swing.*; 
class FindPoints 
{ 
   public static void main(String[] args) 
   { 
      int[][] points = 
     {{10, 20, 30}, 
      {20, 40, 60}, 
      {40, 60, 80}}; 
      String prompt; 
      int class; 
      int level; 
      prompt = JOptionPane.showInputDialog(null, "Class: "); 
      class = Integer.parseInt(prompt); 
      prompt = JOptionPane.showInputDialog(null, "Level: "); 
      level = Integer.parseInt(prompt); 
      JOption.showMessageDialog(null, "Your points: " + ---complete code here-----); 
   } 
} 
The above code depicts a two-dimensional array named points that refers to a Class and Level to determine a point value. Complete the JOption command so that the code will determine a point value based on the points array.

Accepted Answer

The answer of import javax.swing.*; 
class FindPoints 
{ 
   public...

Question 13

When mathematicians use a two-dimensional array, they often call it a ____.

Accepted Answer

A)  grid 
B)  net 
C)  matrix 
D)  mesh

Question 14

If you do not provide values for the elements in a two-dimensional numeric array, the values default to null .

Accepted Answer

A) True 
 B)False

Question 15

The Arrays class ____________________ method sorts the specified array into ascending order.

Accepted Answer

The answer of The Arrays class ____________________ method sorts the...

Question 16

In a(n) ____, you repeatedly compare pairs of items, swapping them if they are out of order, eventually creating a sorted list.

Accepted Answer

A)  range match 
B)  bubble sort 
C)  enhanced for loop 
D)  float sort

Question 17

int[][] myVals = new int[3][] 
myVals[0] = new int[3]; 
myVals[1] = new int[10]; 
myVals[2] = new int[5]; 
The above code depicts a ragged array. What does this mean? Describe the rows and columns that make up this array.

Accepted Answer

The answer of int[][] myVals = new int[3][] 
myVals[0] =...

Question 18

int[][] myVals = {{2, 4, 6, 8},                   {20, 40, 60, 80} };
Using the above two-dimensional array, what is the value of myVals[1][2] ?

Accepted Answer

A)  4 
B)  60 
C)  6 
D)  40

Question 19

What is sorting and how are objects organized as a result of being sorted?

Accepted Answer

The answer of What is sorting and how are objects...

Question 20

With a two-dimensional array, the ____ field holds the number of rows in the array.

Accepted Answer

A)  size 
B)  capacity 
C)  row 
D)  length

Exam 9: Advanced Array Concepts

A method that receives a two-dimensional array uses two ____________________ pairs following the data type in the parameter list of the method header.

You can think of the single dimension of a single dimensional array as the height of the array.

You can add an item at any point in a(n) ____ container and the array size expands automatically to accommodate the new item.

int[][] myVals = {{2, 4, 6}, {1, 3, 5, 7}}; Using the above array, what is the value of myVals.length ?

The ArrayList class ____ method retrieves an item from a specified location in an ArrayList .

The Arrays class ____________________ method assigns the specified value to each element of the specified array.

When creating arrays, Java is limited in size due to limitations on the number of variables and subscripts used.

When you place objects in order beginning with the object that has the lowest value, you are sorting in ____________________ order.

When mathematicians use a two-dimensional array, they often call it a ____.

If you do not provide values for the elements in a two-dimensional numeric array, the values default to null .

The Arrays class ____________________ method sorts the specified array into ascending order.

In a(n) ____, you repeatedly compare pairs of items, swapping them if they are out of order, eventually creating a sorted list.

int[][] myVals = new int[3][] myVals[0] = new int[3]; myVals[1] = new int[10]; myVals[2] = new int[5]; The above code depicts a ragged array. What does this mean? Describe the rows and columns that make up this array.

int[][] myVals = {{2, 4, 6, 8}, {20, 40, 60, 80} }; Using the above two-dimensional array, what is the value of myVals[1][2] ?

What is sorting and how are objects organized as a result of being sorted?

With a two-dimensional array, the ____ field holds the number of rows in the array.