Initial data commit

Task/Word-frequency/Java/word-frequency-1.java

@@ -0,0 +1,13 @@
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;

Task/Word-frequency/Java/word-frequency-2.java

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+void printWordFrequency() throws URISyntaxException, IOException {
+    URL url = new URI("https://www.gutenberg.org/files/135/135-0.txt").toURL();
+    try (BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream()))) {
+        Pattern pattern = Pattern.compile("(\\w+)");
+        Matcher matcher;
+        String line;
+        String word;
+        Map<String, Integer> map = new HashMap<>();
+        while ((line = reader.readLine()) != null) {
+            matcher = pattern.matcher(line);
+            while (matcher.find()) {
+                word = matcher.group().toLowerCase();
+                if (map.containsKey(word)) {
+                    map.put(word, map.get(word) + 1);
+                } else {
+                    map.put(word, 1);
+                }
+            }
+        }
+        /* print out top 10 */
+        List<Map.Entry<String, Integer>> list = new ArrayList<>(map.entrySet());
+        list.sort(Map.Entry.comparingByValue());
+        Collections.reverse(list);
+        int count = 1;
+        for (Map.Entry<String, Integer> value : list) {
+            System.out.printf("%-20s%,7d%n", value.getKey(), value.getValue());
+            if (count++ == 10) break;
+        }
+    }
+}

Task/Word-frequency/Java/word-frequency-3.java

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+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+
+public class WordCount {
+    public static void main(String[] args) throws IOException {
+        Path path = Paths.get("135-0.txt");
+        byte[] bytes = Files.readAllBytes(path);
+        String text = new String(bytes);
+        text = text.toLowerCase();
+
+        Pattern r = Pattern.compile("\\p{javaLowerCase}+");
+        Matcher matcher = r.matcher(text);
+        Map<String, Integer> freq = new HashMap<>();
+        while (matcher.find()) {
+            String word = matcher.group();
+            Integer current = freq.getOrDefault(word, 0);
+            freq.put(word, current + 1);
+        }
+
+        List<Map.Entry<String, Integer>> entries = freq.entrySet()
+            .stream()
+            .sorted((i1, i2) -> Integer.compare(i2.getValue(), i1.getValue()))
+            .limit(10)
+            .collect(Collectors.toList());
+
+        System.out.println("Rank  Word  Frequency");
+        System.out.println("====  ====  =========");
+        int rank = 1;
+        for (Map.Entry<String, Integer> entry : entries) {
+            String word = entry.getKey();
+            Integer count = entry.getValue();
+            System.out.printf("%2d    %-4s    %5d\n", rank++, word, count);
+        }
+    }
+}