CPE 103 Lab Activity

Lookup Tables

Given a string of text, count the number of occurrences of each vowel, consonant, punctuation (on the top row of the keyboard), numeric digit, and all other symbols. (See table below).

Here is the class skeleton: 
public class KeyCounts
{
    
    /**
     * Constructor for objects of class KeyCounts
     * @param String of ascii characters
     */
    public KeyCounts(String keys)

    /** Access the frequencies 
     * @returns array the number of items counted in each category
     *  [DIGITS, VOWELS, CONSONANTS, PUNCTUATION, OTHER]
     */
    public int[] getCount()
    
    /** Calculate the total number of non-OTHER keys counted.
     *  The implementation should iterate over the array 
     *  returned from getCount().
     * @return sum of non-OTHER frequencies
     */ 
    public int getTotal()
}

You are to create TWO implementations.

Part 1

Create an implementation that uses this lookup table of 128 items and this enum definition:
       enum Categories { DIGIT, VOWEL, CONSONANT, PUNCTUATION, OTHER }

Hint: You don't need any if or switch statements.

Write a JUnit test class to verify the correctness of your implementation.

Part 2

One disadvantage of the previous implementation that it's difficult to verify that the lookup table was built correctly.
Since this particular problem is analyzing characters, an alternate solution would be to put all characters of a particular type into a string and then use indexOf() to see if a given character exists in that string.

Hint: Consider an array of strings, and then iterating over it.

The JUnit tests you wrote for part 1 should also work for part2.

Submit your work as described in the syllabus.

FAQ
Q: Part 1 directions said not to use "if" statement, does that apply to part 2 as well?
A: No. You may use a single-alternative "if", but not multiple-alternative or multiple if's.

Q: For part 2, do we need to create a string for OTHER that contains all other characters?
A: You could, but it would be a bit difficult because most of them don't have keyboard equivalents, you'd have to declare them as hex values, and there would be a lot of them.
So an acceptable workaround would be to assume that if the character doesn't fall into one of the first four categories, then it must be OTHER.

Q: Is the implementation for part 2 in a separate class?
A: Yes, that's probably the easiest way to organize your solution.


ASCII Table


Dec
 
Char
 
Category

 
0
 
CTRL-@
 
1
 
CTRL-A
 
2
 
CTRL-B
 
3...26
 
CTRL-C...CTRL-Z
 
27
 
CTRL-[
 
28
 
CTRL-
 
29
 
CTRL-]
 
30
 
CTRL-^
 
31
 
CTRL-_
 
32
   
33
 
!
 PUNCTUATION
 
34
 
"
 
35
 
#
 PUNCTUATION 
36
 
$
 PUNCTUATION 
37
 
%
 PUNCTUATION 
38
 
&
 PUNCTUATION 
39
 
'
 
40
 
(
 PUNCTUATION 
41
 
)
 PUNCTUATION 
42
 
*
 PUNCTUATION 
43
 
+
 PUNCTUATION 
44
 
,
 
45
 
-
 PUNCTUATION 
46
 
.
 
47
 
/
 
48
 
0
 DIGIT
 
49
 
1
 DIGIT 
50
 
2
 DIGIT 
51
 
3
 DIGIT 
52
 
4
 DIGIT 
53
 
5
 DIGIT 
54
 
6
 DIGIT 
55
 
7
 DIGIT 
56
 
8
 DIGIT 
57
 
9
 DIGIT 
58
 
:
 
59
 
;
 
60
 
<
 
61
 
=
 PUNCTUATION 
62
 
>
 
63
 
?
 
64
 
@
 PUNCTUATION 
65
 
A
 VOWEL
 
66
 
B
 CONSONANT
 
67
 
C
 CONSONANT 
68
 
D
 CONSONANT 
69
 
E
 VOWEL 
70
 
F
 CONSONANT 
71
 
G
 CONSONANT 
72
 
H
 CONSONANT 
73
 
I
 VOWEL 
74
 
J
 CONSONANT 
75
 
K
 CONSONANT 
76
 
L
 CONSONANT 
77
 
M
 CONSONANT 
78
 
N
 CONSONANT 
79
 
O
 VOWEL 
80
 
P
 CONSONANT 
81
 
Q
 CONSONANT 
82
 
R
 CONSONANT 
83
 
S
 CONSONANT 
84
 
T
 CONSONANT 
85
 
U
 VOWEL 
86
 
V
 CONSONANT 
87
 
W
 CONSONANT 
88
 
X
 CONSONANT 
89
 
Y
 CONSONANT 
90
 
Z
 CONSONANT 
91
 
[
 
92
 
\
 
93
 
]
 
94
 
^
 PUNCTUATION 
95
 
_  Underscore
 PUNCTUATION 
96
 
`  Back quote
 PUNCTUATION 
97
 
a
 VOWEL 
98
 
b
 CONSONANT 
99
 
c
 CONSONANT 
100
 
d
 CONSONANT 
101
 
e
 VOWEL 
102
 
f
 CONSONANT 
103
 
g
 CONSONANT 
104
 
h
 CONSONANT 
105
 
i
 VOWEL 
106
 
j
 CONSONANT 
107
 
k
 CONSONANT 
108
 
l
 CONSONANT 
109
 
m
 CONSONANT 
110
 
n
 CONSONANT 
111
 
o
 VOWEL 
112
 
p
 CONSONANT 
113
 
q
 CONSONANT 
114
 
r
 CONSONANT 
115
 
s
 CONSONANT 
116
 
t
 CONSONANT 
117
 
u
 VOWEL 
118
 
v
 CONSONANT 
119
 
w
 CONSONANT 
120
 
x
 CONSONANT 
121
 
y
 CONSONANT 
122
 
z
 CONSONANT 
123
 
{
 
124
 
|  Vertical bar
 
125
 
}
 
126
 
~
 PUNCTUATION 
127
 
DEL (Delete)