Added code to parse CSV file

src/main/java/edu/unl/cse/csv_io/CSVReaderWriter.java

+/*
+ * CSV Reader/Writer, copyright (c) 2019 Christopher A. Bohn, bohn@unl.edu.
+ */
+
+
+package edu.unl.cse.csv_io;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.*;
+
+public class CSVReaderWriter {
+    // this does not (yet) handle data elements that include commas and/or are surrounded by quotation marks
+    // use of ClassLoader.getResourceAsStream inspired by https://www.mkyong.com/java/java-read-a-file-from-resources-folder/
+    // use of Map inspired by Python's csv module
+    private static final String DELIMTER = ",";
+    private static final char BYTE_ORDER_MARK = '\ufeff';
+
+    public static Set<Map<String, String>> readCSV(String filename) {
+        Set<Map<String, String>> csvSet = null;
+        ClassLoader classLoader = CSVReaderWriter.class.getClassLoader();
+        try(InputStream inputStream = classLoader.getResourceAsStream("csv/"+filename)) {
+            csvSet = parseCSV(inputStream);
+        } catch (IOException ioException) {
+            System.err.println("Error loading " + filename + ".  " + ioException);
+        }
+        return csvSet;
+    }
+
+    private static Set<Map<String, String>> parseCSV(InputStream inputStream) throws IOException {
+        Set<Map<String, String>> csvSet = new HashSet<>();
+        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
+        String line;
+        List<String> fieldNames = new ArrayList<>();
+        boolean header = true;
+        while ((line = reader.readLine()) != null) {
+            String[] elements = line.split(DELIMTER);
+            if (header) {
+                if (elements[0].charAt(0) == BYTE_ORDER_MARK) {
+                    elements[0] = elements[0].substring(1);     // remove text-encoding character sometimes added by Excel
+                }
+                fieldNames.addAll(Arrays.asList(elements));
+                header = false;
+            } else {
+                Map<String, String> row = new HashMap<>();
+                int column = 0;
+                for (String element: elements) {
+                    row.put(fieldNames.get(column++), element);
+                }
+                csvSet.add(row);
+            }
+        }
+        return csvSet;
+    }
+
+    public static void main(String[] args) {
+        Set<Map<String, String>> demo = readCSV("demo.csv");
+        Set<String> fieldNames = null;
+        for (Map<String, String> row: demo) {
+            if (fieldNames == null) {
+                fieldNames = row.keySet();
+            }
+            for (String field: fieldNames) {
+                String value = row.get(field);
+                System.out.print(field + ":" + value + "\t");
+            }
+            System.out.println();
+        }
+    }
+}

src/main/resources/csv/demo.csv

+A, B, C, D
+one,two,,three
+four,,five,six
+7,8,9,
+,alpha,beta,gamma
\ No newline at end of file