True/False Indicate whether the
statement is true or false.
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1.
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The isUpperCase( ) method returns the uppercase equivalent of an
argument.
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2.
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The first position of a String object begins with 1.
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3.
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Array subscripts may have floating-point values.
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4.
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You can declare arrays that hold elements of any type.
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Multiple Choice Identify the
choice that best completes the statement or answers the question.
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5.
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Which of the following would you use to compare the contents of two
Strings?
a. | equals( ) | c. | isEqual( ) | b. | == | d. | = |
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6.
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If two String objects have identical contents, equals( ) returns
____.
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7.
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What is the output of the following program?
public class Test
{ public static void main(String[] args)
{ String s1 =
"Testing"; String s2 =
"testing"; String s3 =
s1.toLowerCase(); if
(s2.equals(s3))
System.out.println("true");
else
System.out.println("false"); } }
a. | true | c. | Testing | b. | false | d. | testing |
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8.
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Which of the following would you use to compare strings without considering
case?
a. | == | c. | equals( ) | b. | equalsIgnoreCase( ) | d. | isEqual( ) |
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9.
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The output of the following program is ____.
public class Test
{ public static void main(String[] args) {
String s1 = "Programs"; String s2 =
"programs"; if
(s1.equalsIgnoreCase(s2))
System.out.println("True");
else
System.out.println("False"); } }
a. | programs | c. | False | b. | True | d. | Programs |
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10.
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The value of n after the following program executes is
____.
public class Test { public static void main(String[] args)
{ String s1 =
"Programs"; String s2 =
"Progress"; int n =
s1.compareTo(s2); System.out.println(n); } }
a. | 0 | c. | positive value | b. | false | d. | negative value |
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11.
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The output of the following program is ____.
public class Test
{ public static void main(String[] args) { String name =
"Jack Smith"; int i = name.indexOf('
'); System.out.println("i = " + i); } }
a. | i = -1 | c. | i = 4 | b. | i = 3 | d. | i = 5 |
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12.
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What is the value of c after the following code
executes?
String s =
"Application"; char c = s.charAt(5);
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13.
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What is the value of result?
String s =
"Programming"; boolean result =
s.startsWith("Program");
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14.
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The output of the following program is ____.
public class Test
{ public static void main(String[] args) { String
location = "downtown"; int j =
location.indexOf('l'); System.out.println("j = " +
j); } }
a. | j = -1 | c. | j = 4 | b. | j = 0 | d. | j = 8 |
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15.
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What is the output of the following program?
public class Test
{ public static void main(String[] args) { String myString
= "A class about strings"; String myString2 = myString.substring(0,
13) + " main"; System.out.println(myString2);
} }
a. | A class about strings | c. | A class main | b. | A class about main | d. | A class
aboutmain |
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16.
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Which is the correct declaration for an array of floats?
a. | float[] anArrayOfFloats; | c. | float
anArrayOfFloats; | b. | [] float anArrayOfFloats; | d. | anArrayOfFloats
float[]; |
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17.
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What symbol do you use next to a data type to indicate an array?
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18.
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Which one of the following is a declaration of an int array?
a. | [ ] int a; | c. | a [int]; | b. | integer [ ] a; | d. | int [ ]
a; |
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19.
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To allocate space for an array, you would use ____.
a. | new | c. | mem | b. | alloc | d. | spcalloc |
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20.
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What is the index of 300?
int [] a = {50, 75, 100,
150, 200, 300, 450, 510, 700};
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21.
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Each element of myArray has a value of ____.
int [] myArray = new int[10];
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22.
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What is the length of the following array?
int[] a = {2, 4, 6, 8, 10};
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23.
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How many elements are there in the following array?
boolean[] answers = { true, false, true, true, false };
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24.
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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 |
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25.
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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 |
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26.
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Which statement reserves enough computer memory for 7 Employee
objects?
a. | Employee[] emp = new Employee; | c. | Employee emp = new
Employee[7]; | b. | Employee[7] emp = new
Employee; | d. | Employee[
] emp = new Employee[7]; |
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27.
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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 |
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28.
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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 is a | c. | this test | b. | This is | d. | This test |
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29.
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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 |
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30.
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Which one of the following is the correct declaration for a String
array?
a. | String anArrayOfStrings; | c. | String[]
anArrayOfStrings; | b. | anArrayOfStrings
String[]; | d. | string[] anArrayOfStrings; |
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Completion Complete each
statement.
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31.
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A(n) ____________________ is a variable that holds a memory address.
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32.
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The char data type is a(n) ____________________ data type.
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Matching
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Match each item with a statement below. a. | length property | f. | Double | b. | immutable | g. | capacity | c. | concatenation | h. | anonymous | d. | StringBuffer | i. | String | e. | Character |
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33.
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Objects that cannot be changed.
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34.
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A class that defines methods that can manipulate or inspect single-character
data.
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35.
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A wrapper class that is imported into programs automatically.
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36.
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A class for working with fixed-string data.
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37.
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Joining a simple variable to a String, creating a longer
String.
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