Initial data commit

Task/Letter-frequency/Java/letter-frequency-2.java

@@ -0,0 +1,36 @@
+public static void main(String[] args) throws IOException {
+    Map<Integer, Integer> frequencies = frequencies("src/LetterFrequency.java");
+    System.out.println(print(frequencies));
+}
+
+static String print(Map<Integer, Integer> frequencies) {
+    StringBuilder string = new StringBuilder();
+    int key;
+    for (Map.Entry<Integer, Integer> entry : frequencies.entrySet()) {
+        key = entry.getKey();
+        string.append("%,-8d".formatted(entry.getValue()));
+        /* display the hexadecimal value for non-printable characters */
+        if ((key >= 0 && key < 32) || key == 127) {
+            string.append("%02x%n".formatted(key));
+        } else {
+            string.append("%s%n".formatted((char) key));
+        }
+    }
+    return string.toString();
+}
+
+static Map<Integer, Integer> frequencies(String path) throws IOException {
+    try (InputStreamReader reader = new InputStreamReader(new FileInputStream(path))) {
+        /* key = character, and value = occurrences */
+        Map<Integer, Integer> map = new HashMap<>();
+        int value;
+        while ((value = reader.read()) != -1) {
+            if (map.containsKey(value)) {
+                map.put(value, map.get(value) + 1);
+            } else {
+                map.put(value, 1);
+            }
+        }
+        return map;
+    }
+}