Stream API

.gitignore

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+*.idea

StreamAPI/src/WordCounter.java

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+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Scanner;
+
+public class WordCounter {
+
+    private final File file;
+
+    private WordCounter(String name) {
+        file = new File(name);
+    }
+
+    private static Map<String, Integer> MyAccumulator(Map<String, Integer> previous, String next) {
+        if (previous.containsKey(next)) {
+            previous.put(next, previous.get(next) + 1);
+        } else {
+            previous.put(next, 1);
+        }
+        return previous;
+    }
+
+    private static Map<String, Integer> MyCombiner(Map<String, Integer> firstMap, Map<String, Integer> secondMap) {
+        for (String key : secondMap.keySet()) {
+            if (firstMap.containsKey(key)) {
+                firstMap.put(key, firstMap.get(key) + secondMap.get(key));
+            } else {
+                firstMap.put(key, secondMap.get(key));
+            }
+        }
+        return firstMap;
+    }
+
+    private Map<String, Integer> count() throws IOException {
+        return Files.lines(file.toPath())
+                .flatMap((l) -> Arrays.stream(l.split("[\\p{Punct}\\s…«»—]")))
+                .filter((w) -> w.length() > 0)
+                .map(String::toLowerCase)
+                .collect(HashMap::new,
+                WordCounter::MyAccumulator,
+                WordCounter::MyCombiner);
+    }
+
+
+    public static void main(String... args) {
+        File file = new File("vs.txt");
+        Map<String, Integer> map = new HashMap<>();
+        try {
+            Scanner scanner = new Scanner(file);
+            ArrayList<String> strings = new ArrayList<>();
+            while (scanner.hasNext()) {
+                strings.add(scanner.nextLine());
+            }
+
+            for (String string : strings) {
+                String[] words = string.toLowerCase().split("[\\p{Punct}\\s…«»—]");
+                for (String word : words) {
+                    if (map.containsKey(word)) {
+                        map.put(word, map.get(word) + 1);
+                    } else if (!word.equals("")) {
+                        map.put(word, 1);
+                    }
+                }
+            }
+
+            WordCounter counter = new WordCounter("vs.txt");
+            if (map.equals(counter.count())) {
+                System.out.println("Works!");
+            }
+
+        } catch (IOException e) {
+            System.out.println("Error");
+        }
+    }
+}