--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/java/src/main/java/com/google/anatofuz/LogAnalyzer.java	Wed Jul 18 17:25:20 2018 +0900
@@ -0,0 +1,55 @@
+package com.google.anatofuz;
+
+import java.io.File;
+import java.io.FileReader;
+import java.io.BufferedReader;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.*;
+import java.util.regex.Pattern;
+import java.util.regex.Matcher;
+
+public class LogAnalyzer {
+
+    public static void main(String args[]) {
+
+        File file = new File("/var/log/system.log");
+
+        if (args.length != 0) {
+            if (args[0].equals("-f")) {
+                file = new File(args[1]);
+            }
+        }
+
+        try {
+            FileReader filereader = new FileReader(file);
+            BufferedReader bufferedReader = new BufferedReader(filereader);
+
+            String line;
+            Map<String,Integer>  map = new HashMap<String,Integer>(0);
+            Pattern p = Pattern.compile("\\w+ \\d{0,2} (?:\\d{2}:?){3} (?:anatofuzMBP|anatofuz-15) ([\\w.]+)\\[\\d+\\]");
+
+
+            while ((line = bufferedReader.readLine()) != null) {
+                Matcher matcher = p.matcher(line);
+                if (matcher.find()) {
+                    map.merge(matcher.group(1),1,Integer::sum);
+                }
+            }
+
+            int sum = 0;
+
+            for (String key :map.keySet()){
+                sum += map.get(key);
+            }
+
+            System.out.println(sum);
+
+
+        } catch (FileNotFoundException ex){
+            System.out.println(ex);
+        } catch (IOException ex){
+            System.out.println(ex);
+        }
+    }
+}