update

java/wordStat/WordStat.java

@@ -0,0 +1,68 @@
+import java.io.*;
+import java.nio.charset.StandardCharsets;
+import java.util.*;
+
+/**
+ * @author Nikita Doschennikov (me@fymio.us)
+ */
+public class WordStat {
+
+    public static void main(String[] args) {
+        if (args.length != 2) {
+            System.err.println("incorrect input!");
+            System.err.println("usage: java WordStat <inputFile> <outputFile>");
+        }
+
+        String inputFileName = args[0];
+        String outputFileName = args[1];
+        try {
+            BufferedReader r = new BufferedReader(
+                new FileReader(inputFileName)
+            );
+
+            LinkedHashMap<String, Integer> wordCount = new LinkedHashMap<>();
+            StringBuilder sb = new StringBuilder();
+
+            int data = r.read();
+            while (data != -1) {
+                char c = (char) data;
+
+                if (
+                    Character.getType(c) == Character.DASH_PUNCTUATION ||
+                    Character.isLetter(c) ||
+                    c == '\''
+                ) {
+                    sb.append(c);
+                } else {
+                    if (!sb.isEmpty()) {
+                        String word = sb.toString().toLowerCase();
+                        wordCount.put(
+                            word,
+                            wordCount.getOrDefault(word, 0) + 1
+                        );
+                        sb.setLength(0);
+                    }
+                }
+
+                data = r.read();
+            }
+
+            r.close();
+
+            PrintWriter writer = new PrintWriter(
+                outputFileName,
+                StandardCharsets.UTF_8
+            );
+
+            for (Map.Entry<String, Integer> entry : wordCount.entrySet()) {
+                String key = entry.getKey();
+                int value = entry.getValue();
+                writer.println(key + " " + value);
+            }
+
+            writer.close();
+        } catch (Exception ex) {
+            System.err.println("An error occured: " + ex.getMessage());
+        }
+    }
+}