9 модуль Сердюков ПрИ-201

task01/src/com/example/task01/Pair.java

@@ -1,5 +1,63 @@
 package com.example.task01;
 
-public class Pair {
-    // TODO напишите реализацию
+import java.util.Objects;
+import java.util.function.BiConsumer;
+
+public class Pair<A, B>
+{
+    private final A first;
+    private final B second;
+
+    private Pair(A first, B last)
+    {
+        this.first = first;
+        this.second = last;
+    }
+
+    public static <A, B> Pair<A, B> of(A first, B second)
+    {
+        return new Pair<>(first, second);
+    }
+
+    public A getFirst()
+    {
+        return first;
+    }
+
+    public B getSecond()
+    {
+        return second;
+    }
+
+    public void ifPresent(BiConsumer<? super A, ? super B> action)
+    {
+        if (first != null && second != null)
+        {
+            action.accept(first, second);
+        }
+    }
+
+    @Override
+    public boolean equals(Object obj)
+    {
+        if (this == obj)
+        {
+            return true;
+        }
+
+        if (obj == null || getClass() != obj.getClass())
+        {
+            return false;
+        }
+
+        Pair<?, ?> pair = (Pair<?, ?>) obj;
+
+        return Objects.equals(first, pair.first) && Objects.equals(second, pair.second);
+    }
+
+    @Override
+    public int hashCode()
+    {
+        return Objects.hash(first, second);
+    }
 }

task01/src/com/example/task01/Task01Main.java

@@ -4,11 +4,8 @@
 import java.io.InputStream;
 
 public class Task01Main {
-    public static void main(String[] args) throws IOException {
-
-        // TODO С корректно реализованным классом Pair должен компилироваться и успешно работать следующий код:
-
-        /*
+    public static void main(String[] args) throws IOException
+    {
         Pair<Integer, String> pair = Pair.of(1, "hello");
         Integer i = pair.getFirst(); // 1
         String s = pair.getSecond(); // "hello"
@@ -21,8 +18,6 @@ public static void main(String[] args) throws IOException {
         Pair<Integer, String> pair2 = Pair.of(1, "hello");
         boolean mustBeTrue = pair.equals(pair2); // true!
         boolean mustAlsoBeTrue = pair.hashCode() == pair2.hashCode(); // true!
-        */
-
     }
 
 }

task02/src/com/example/task02/SavedList.java

@@ -1,35 +1,86 @@
 package com.example.task02;
 
-import java.io.File;
-import java.io.Serializable;
+import java.io.*;
+import java.nio.file.Files;
 import java.util.AbstractList;
+import java.util.ArrayList;
 
-public class SavedList<E extends Serializable> extends AbstractList<E> {
+public class SavedList<E extends Serializable> extends AbstractList<E>
+{
+    private final ArrayList<E> list = new ArrayList<>();
+    private final File file;
 
-    public SavedList(File file) {
+    public SavedList(File file)
+    {
+        this.file = file;
+        loadFromFile();
+    }
+
+    private void loadFromFile()
+    {
+        if (!file.exists())
+        {
+            return;
+        }
+
+        try (ObjectInputStream stream = new ObjectInputStream(Files.newInputStream(file.toPath())))
+        {
+            @SuppressWarnings("unchecked") // <- Чтобы глаза не мазолило
+            ArrayList<E> loadedList = (ArrayList<E>) stream.readObject();
+            list.addAll(loadedList);
+        }
+
+        catch (IOException | ClassNotFoundException e)
+        {
+            throw new RuntimeException("Error when loading data from file", e);
+        }
+    }
+
+    private void saveToFile()
+    {
+        try (ObjectOutputStream stream = new ObjectOutputStream(Files.newOutputStream(file.toPath())))
+        {
+            stream.writeObject(list);
+        }
+
+        catch (IOException e)
+        {
+            throw new RuntimeException("Error when saving data to file", e);
+        }
     }
 
     @Override
-    public E get(int index) {
-        return null;
+    public E get(int index)
+    {
+        return list.get(index);
     }
 
     @Override
-    public E set(int index, E element) {
-        return null;
+    public E set(int index, E element)
+    {
+        E oldElement = list.set(index, element);
+        saveToFile();
+        return oldElement;
     }
 
     @Override
-    public int size() {
-        return 0;
+    public int size()
+    {
+        return list.size();
     }
 
     @Override
-    public void add(int index, E element) {
+    public void add(int index, E element)
+    {
+        list.add(index, element);
+        saveToFile();
     }
 
     @Override
-    public E remove(int index) {
-        return null;
+    public E remove(int index)
+    {
+        E removedElement = list.remove(index);
+        saveToFile();
+        return removedElement;
     }
 }

task03/src/com/example/task03/Task03Main.java

@@ -1,24 +1,49 @@
 package com.example.task03;
 
-import java.io.FileInputStream;
-import java.io.IOException;
-import java.io.InputStream;
+import java.io.*;
 import java.nio.charset.Charset;
-import java.util.List;
-import java.util.Set;
+import java.util.*;
+import java.util.stream.Collectors;
 
-public class Task03Main {
-
-    public static void main(String[] args) throws IOException {
+public class Task03Main
+{
 
+    public static void main(String[] args) throws IOException
+    {
         List<Set<String>> anagrams = findAnagrams(new FileInputStream("task03/resources/singular.txt"), Charset.forName("windows-1251"));
-        for (Set<String> anagram : anagrams) {
+        for (Set<String> anagram : anagrams)
+        {
             System.out.println(anagram);
         }
 
     }
 
-    public static List<Set<String>> findAnagrams(InputStream inputStream, Charset charset) {
-        return null;
+    public static List<Set<String>> findAnagrams(InputStream inputStream, Charset charset)
+    {
+        Map<String, Set<String>> result = new TreeMap<>();
+
+        try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, charset)))
+        {
+            reader.lines().map(String::toLowerCase)
+                    .filter(word -> word.matches("[а-яё]+") && word.length() >= 3)
+
+                    .forEach(word ->
+                    {
+                        String sortedChars = word.chars().sorted()
+                                .mapToObj(c -> String.valueOf((char) c))
+                                .collect(Collectors.joining());
+
+                        result.computeIfAbsent(sortedChars, key -> new TreeSet<>()).add(word);
+                    });
+        }
+
+        catch (IOException e)
+        {
+            throw new RuntimeException("Somethings wrong", e);
+        }
+
+        return result.values().stream()
+                .filter(group -> group.size() >= 2)
+                .collect(Collectors.toList());
     }
 }