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Basics Cottrell

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
What is the output of the following program?

public class Test {
  public static void main(String [] args) {
    int [] a = {1, 2, 3, 4, 5, 6, 7, 8, 9};
    int value = 9;
    boolean foundIt = false;
    for(int i=0; i < a.length; i++) {
      if (a[i] == value) {
        System.out.println(i);
        foundIt = true;
      }
    } 
    if (!foundIt)
      System.out.println("value not found");
  }
}
a.
value not found
c.
8
b.
-1
d.
9
 

 2. 
Which assigns the value 10 to the first array element in the studentAges array?
a.
studentAges(1) = 10;
c.
studentAges[1] = 10;
b.
studentAges[0] = 10;
d.
studentAges[0:10];
 

 3. 
Which one of the following is a declaration of an int array?
a.
a [int];
c.
integer [ ] a;
b.
int [ ] a;
d.
[ ] int a;
 

 4. 
What symbol do you use next to a data type to indicate an array?
a.
[ ]
c.
( )
b.
{ }
d.
| |
 

 5. 
Which is not a keyword used to write a loop?
a.
if
c.
for
b.
while
d.
do
 

 6. 
The array instance has an attribute named ____ that contains the number of elements in the array.
a.
number
c.
length
b.
elementNumber
d.
count
 

 7. 
How many elements are there in the following array?

    boolean[] answers = { true, false, true, true, false };
a.
2
c.
5
b.
4
d.
6
 

 8. 
Which is not true?
a.
Java uses code blocks to group statements.
b.
The compiler requires you to indent code.
c.
The compiler lets you extend a statement over more than one line - no continuation character is required.
d.
None of the above.
 

 9. 
What is the output of the following code segment?

          int X = 10;
          if (X >= 10) {
               System.out.print(“ABC”);
         System.out.println(“XYZ”);
          }
a.
ABCXYZ
c.
ABC
b.
ABC
XYZ
d.
XYZ
 

 10. 
Which is not a Java logical operator?
a.
>=
c.
=
b.
||
d.
!
 

 11. 
Which correctly assigns the character value A to variable c?
a.
assign c = 'A';
c.
c = 'A';
b.
c = "A";
d.
c = A
 

 12. 
Which one of the following is the correct declaration for a String array?
a.
String anArrayOfStrings;
c.
string[] anArrayOfStrings;
b.
String[] anArrayOfStrings;
d.
anArrayOfStrings String[];
 

 13. 
The statement String s; does not ____.
a.
point to a String instance
c.
create a variable named s
b.
have a null value
d.
None of the above.
 

 14. 
What is the output of the following program?

public class ArrayDemo {
    public static void main(String[] args) {
        int[] anArray;            
        anArray = new int[10];     
        for (int i = 0; i < anArray.length; i++) {
            anArray[i] = i;
            System.out.print(anArray[i] + " ");
        }
        System.out.println();
    }
}
a.
0 1 2 3 4 5 6 7 8
c.
   1 2 3 4 5 6 7 8 9
b.
0 1 2 3 4 5 6 7 8 9
d.
0 1 2 3 4 5 6 7 8 9 10
 

 15. 
Which is not a valid Java identifier?
a.
3address
c.
$amount
b.
last_name
d.
None of the above.
 

 16. 
To allocate space for an array, you would use ____.
a.
alloc
c.
mem
b.
new
d.
spcalloc
 

 17. 
In the statement System.out.print.ln("Hello World Wide Web");, the information that is contained in parentheses is called a(n) ____.
a.
method
c.
identifier
b.
text object
d.
argument
 

 18. 
Which correctly invokes the method println?
a.
System.out.println("b = " + b);
c.
println.System.out("b = " + b);
b.
println System.out("b = " + b);
d.
System.out(println("b = " + b));
 

 19. 
Each element of myArray has a value of ____.
      
    boolean myArray = new boolean[100];
a.
null
c.
true
b.
false
d.
0
 

 20. 
The ____ symbol is used to determine equality.
a.
+=
c.
==
b.
\=
d.
=
 

 21. 
The operator that has a higher precedence than plus (+) is ____.
a.
>
c.
%
b.
?:
d.
>=
 

 22. 
How many rows are there in the following array declaration?

  int [ ][ ] intArray = new int[5][4];
a.
4
c.
9
b.
5
d.
20
 

 23. 
The following expression is interpreted as ____.

    age >= 18 && age <= 65
a.
(age >= 18) && (age <= 65)
c.
age >= (18 && age) <= 65
b.
(((age >= 18) && age) <= 65)
d.
(age >= (18 && (age <= 65)))
 

 24. 
A ____ variable uses a class name as a data type and points to an instance of that class.
a.
complex
c.
reference
b.
pointer
d.
primitive
 

 25. 
What is the index of 300?

   int [] a = {50, 75, 100, 150, 200, 300, 450, 510, 700};
a.
3
c.
5
b.
4
d.
6
 

 26. 
The following expression will be interpreted as ____.

    a < b | | c >= d && e == f
a.
(a < b | | c >= d) && (e == f)
c.
(a < (b | | c) >= d) && (e == f)
b.
(a < b) | | ((c >= d) && (e == f))
d.
(a < b) | | (c >= d) && (e == f)
 

 27. 
The limit on the number of dimensions in a Java array is ____.
a.
five
c.
ten
b.
eight
d.
None of the above.
 

 28. 
The statement 11%2 returns the value ____.
a.
22
c.
5
b.
9
d.
1
 

 29. 
Which data type does not contain numeric data without decimals?
a.
short
c.
int
b.
long
d.
double
 

 30. 
What is the output of the following program?

public class Test {
  public static void main(String [] args) {
    int[] a = {2, 4, 6, 8, 10, 12, 14};
    for(int i = 0; i < a.length; i++) {
      if (i > 5)
        a[i] *= 2;
    }
    printArray(a);
  }

  public static void printArray(int [] a) {
    for(int i=0; i < a.length; i++) {
      System.out.print(a[i] + "  ");
    }
  }
}
a.
2  4  6  8  10  24  28
c.
2  4  6  8  20  24  28
b.
2  4  6  8  10  12  28
d.
2  4  6  8  10  12  14
 

 31. 
____ loops are post-test.
a.
do
c.
for
b.
while
d.
All of the above.
 

 32. 
Which of the following operators has the highest precedence?
a.
| |
c.
&&
b.
!
d.
=
 

 33. 
Which is the correct declaration for an array of floats?
a.
[] float anArrayOfFloats;
c.
float[] anArrayOfFloats;
b.
anArrayOfFloats float[];
d.
float anArrayOfFloats;
 

 34. 
The output of the following program is ____.

public class Test {
  public static void main(String [] args) {
    int[] a = new int[7];
    for(int i=0; i < 5; i++) {
      a[i] = i % 2;
    }
    printArray(a);
  }

  public static void printArray(int [] a) {
    for(int i=0; i < a.length; i++) {
      System.out.print(a[i] + "  ");
    }
  }
}
a.
0  1  0  1  0  1  1
c.
1  0  1  0  0  0  0
b.
0  1  0  1  0  0  0
d.
0  1  0  1  0  1  1
 

 35. 
____ delineates a block of code.
a.
( )
c.
/ /
b.
[ ]
d.
{ }
 

 36. 
!(expr1 && expr2) is equivalent to ____.
a.
!(expr1) && !(expr2)
c.
!(expr1) | | expr2
b.
expr1 | | expr2
d.
!(expr1) | | !(expr2)
 

 37. 
Each element of myArray has a value of ____.

    int [] myArray = new int[10];
a.
0
c.
-1
b.
null
d.
1
 

 38. 
What is the length of the following array?

    int[] a = {2, 4, 6, 8, 10};
a.
5
c.
7
b.
6
d.
10
 

 39. 
The output of the following program is ____.

public class Test {
  public static void main(String [] args) {
    String [] a = {"One", "Two", "Three", "Four", "Five"};
    for(int i = 0; i < a.length; i++) {
      if (a[i].equals("Three"))
        System.out.println(i);
    }
  }
}
a.
1
c.
Three
b.
2
d.
3
 

 40. 
Which operator will negate the result of a Boolean expression?
a.
&
c.
%
b.
!
d.
^
 

 41. 
Assume that two integer variables, a and b, have values of 15 and 2 respectively.  What is the result of a / b?
a.
7
c.
An error will result.
b.
8
d.
7.5
 

 42. 
The following is an example of a(n) ____.

    double [ ][ ] myArray = new double[2][5];
a.
three-dimensional array
c.
one-dimensional array
b.
two-dimensional array
d.
five-dimensional array
 

 43. 
What is the output of the following program?

public class Test {
  public static void main(String[] args) {
     String [] a = {"This", "is", "a", "test"};
     for (int i = 0; i < a.length; i++) {
         if (a[i].length() > 2)
            System.out.print(a[i] + " ");
     }
  }
}
a.
this test
c.
This is
b.
This test
d.
This is a
 

 44. 
Which statement reserves enough computer memory for 7 Employee objects?
a.
Employee[ ] emp = new Employee[7];
c.
Employee[7] emp = new Employee;
b.
Employee[] emp = new Employee;
d.
Employee emp = new Employee[7];
 

Completion
Complete each statement.
 

 45. 
In Java, the equal sign (=) is called the ____________________ operator.
 

 

 46. 
If the variable i has a value of 7, ++i returns a value of ____________________.
 

 

 47. 
To write the statement total = total + 5; using the assignment operator together with the arithmetic operator you should use ____________________.
 

 

 48. 
The single line of code to declare a four-element array of integer elements called studentAges is ____________________.
 

 

 49. 
The concatenation operator is the ____________________.
 

 

 50. 
The Java ____________________ statement evaluates an expression and then executes one block of code if the expression is true and another code block if the expression is false.
 

 

 51. 
You can temporarily change the data type of the value contained in a variable using a(n) ____________________.
 

 

 52. 
True or false values are also known as ____________________ values.
 

 

 53. 
The keyword final in front of a variable indicates that the variable is a(n) ____________________.
 

 

 54. 
All array elements must have the same ____________________.
 

 

 55. 
The ____________________ field contains the number of elements in an array.
 

 
 
nar001-1.jpg
 

 56. 
Figure 2-11 is an example of a(n) ____________________ statement.
 

 

Matching
 
 
Match each item with a statement below.
a.
pass by reference
f.
pass by value
b.
multidimensional array
g.
one-dimensional array
c.
element
h.
parallel array
d.
two-dimensional array
i.
sorting
e.
subscript
 

 57. 

 Process of passing items to a method in which the receiving method receives the actual memory address of the item.
 

 58. 

 Array with the same number of elements as another, and for which the values in corresponding elements are related.
 

 59. 

 An array that may have more than two dimensions.
 

 60. 

 An array that you can picture as a column of values,and whose elements you can access using a single subscript.
 

 61. 

 Array that mathematicians often call a matrix or a table.
 

 62. 

 Process of arranging a series of objects in some logical order.
 

 63. 

 Process of passing items to a method where a copy is made and used within the receiving method.
 

 64. 

 One of an array’s variables.
 

 65. 

 An integer contained within square brackets that indicates one of an array’s variables.
 

True/False
Indicate whether the statement is true or false.
 

 66. 
In Java, each source code file actually defines a class.
 

 67. 
Java includes the keyword end if to indicate the end of an if-else statement.
 

 68. 
You can declare arrays that hold elements of any type.
 

 69. 
Array subscripts may have floating-point values.
 

 70. 
Each row of a two-dimensional array must have the same length.
 

 71. 
The following assigns 14 to the first element of someNumbers.

    someNumbers[1][1] = 14;
 

 72. 
Java is not case sensitive.
 

 73. 
The statement j = ++i; is the same as the statement j = i++;.
 

 74. 
A reference variable contains data.
 

 75. 
The statement int testScoreTable[][] = new int [5][4]; declares an array with five columns and four rows.
 

 76. 
Java uses <> to mean not equal to.
 

Modified True/False
Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.
 

 77. 
A(n) pre-test loop tests the terminating condition at the beginning of the loop. _________________________

 

 78. 
You can access the individual elements of the array by writing the array reference variable followed by the index value of the element enclosed in brackets. _________________________

 

 79. 
A string literal uses single quotes. _________________________

 

 80. 
If a method is public, it means that any other program can invoke this method. _________________________

 

 81. 
You should use a(n) do loop when you want to force the execution of the statements in the loop body at least once. _________________________

 

 82. 
The Arithmetic class has methods to accomplish exponentiation, rounding, and numerous other tasks. _________________________

 

 83. 
Int, short, and float are all considered primitive data types. _________________________

 



 
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