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Issue 239 fixed: 3.6 listing added #243

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Issue 239 fixed: 3.6 listing added #243

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c4fd0a7
added listing blocks
habibasorour Jul 27, 2026
1ff02cb
added listing to text
habibasorour Jul 27, 2026
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21 changes: 13 additions & 8 deletions source/ch3_javadatatypes.ptx
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Original file line number Diff line number Diff line change
Expand Up @@ -826,11 +826,11 @@ public class HistoArray {
</p>

<p>
Lets stay with a simple frequency counting example, only this time we will count the frequency of words in a document. A simple Python program for this job could look like this:
Lets stay with a simple frequency counting example, only this time we will count the frequency of words in a document. <xref ref="python-word-count" text="type-global"/> shows a simple Python program for what this could look.
</p>


<program xml:id="python-input-file2" interactive="activecode" language="python">
<listing xml:id="python-word-count">
<program interactive="activecode" language="python">
<code>
def main():
data = open('alice30.txt')
Expand All @@ -845,11 +845,14 @@ def main():
main()
</code> <tests> </tests>
</program>
</listing>

<p>
This program reads the file <c>alice30.txt</c> (which follows), and it then splits it into a list of words. Next it creates a dictionary called <c>count</c> which maps each word to the number of times that word occurs in the text. Finally, it prints out the words in alphabetical order along with their frequency.
This program reads the file <c>alice30.txt</c> in <xref ref="datafile-alice1" text="type-global"/>, and it then splits it into a list of words. Next it creates a dictionary called <c>count</c> which maps each word to the number of times that word occurs in the text. Finally, it prints out the words in alphabetical order along with their frequency.
</p>

<data xml:id="datafile-alice1">
<title>Data file for testing the word frequency program</title>
<datafile label="datafile-alice1" filename="alice30.txt" editable="no" cols="30" rows="15">
<pre>
Down, down, down. Would the fall NEVER
Expand All @@ -872,12 +875,13 @@ main()
nice grand words to say.)
</pre>
</datafile>
</data>
<p>
Notice that the structure of the program is very similar to the numeric histogram program.
Notice that the structure of <xref ref="java-word-count" text="type-global"/> is very similar to the numeric histogram program.
</p>


<program xml:id="java-use-input-file" interactive="activecode" language="java" datafile="alice30.txt">
<listing xml:id="java-word-count">
<program interactive="activecode" language="java" datafile="alice30.txt">
<code>
import java.util.Scanner;
import java.util.ArrayList;
Expand Down Expand Up @@ -915,9 +919,10 @@ public class HistoMap {
}
</code> <tests> </tests>
</program>
</listing>

<p>
Improve the program above to remove the punctuation.
Improve <xref ref="java-word-count" text="type-global"/> to remove the punctuation.
</p>
</section>

Expand Down