1

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

@@ -1,5 +1,52 @@
 package com.example.task01;
 
-public class Pair {
-    // TODO напишите реализацию
+import java.util.Objects;
+import java.util.function.BiConsumer;
+
+public class Pair<T1, T2> {
+
+    private final T1 _first;
+    private final T2 _second;
+
+    private Pair(T1 first, T2 second) {
+        this._first = first;
+        this._second = second;
+    }
+
+    public static <T1, T2> Pair<T1, T2> of(T1 first, T2 second) {
+        return new Pair<>(first, second);
+    }
+
+    public T1 getFirst() {
+        return _first;
+    }
+
+    public T2 getSecond() {
+        return _second;
+    }
+
+    public void ifPresent(BiConsumer<? super T1, ? super T2> consumer) {
+        if (_first != null || _second != null) { // Изменено условие
+            consumer.accept(_first, _second);
+        }
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Pair<?, ?> pair = (Pair<?, ?>) o;
+        return Objects.equals(_first, pair._first) &&
+                Objects.equals(_second, pair._second);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(_first, _second);
+    }
+
+    @Override
+    public String toString() {
+        return "Pair{" + "first=" + _first + ", second=" + _second + '}';
+    }
 }

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

@@ -6,22 +6,36 @@
 public class Task01Main {
     public static void main(String[] args) throws IOException {
 
-        // TODO С корректно реализованным классом Pair должен компилироваться и успешно работать следующий код:
-
-        /*
-        Pair<Integer, String> pair = Pair.of(1, "hello");
-        Integer i = pair.getFirst(); // 1
-        String s = pair.getSecond(); // "hello"
-
-        pair.ifPresent((first, second) -> {
-            System.out.println(first);
-            System.out.println(second);
-        });
-
-        Pair<Integer, String> pair2 = Pair.of(1, "hello");
-        boolean mustBeTrue = pair.equals(pair2); // true!
-        boolean mustAlsoBeTrue = pair.hashCode() == pair2.hashCode(); // true!
-        */
+        // Создаем пару с двумя значениями
+        Pair<String, Integer> pair = Pair.of("Hello", 42);
+
+        // Получаем элементы пары
+        System.out.println("1: " + pair.getFirst()); // Вывод: Hello
+        System.out.println("2: " + pair.getSecond()); // Вывод: 42
+
+        // Проверяем работу ifPresent
+        pair.ifPresent((first, second) ->
+                System.out.println("1: " + first + " 2 " + second)
+        );
+
+        // Создаем пару с одним значением null
+        Pair<String, Integer> halfEmptyPair = Pair.of("Hello", null);
+        halfEmptyPair.ifPresent((first, second) ->
+                System.out.println("223")
+        );
+
+        // Сравниваем пары
+        Pair<String, Integer> pair2 = Pair.of("Hello", 42);
+        System.out.println(pair.equals(pair2));
+
+        // Проверяем работу с null
+        Pair<String, String> emptyPair = Pair.of(null, null);
+        System.out.println(emptyPair.getFirst() + ", " + emptyPair.getSecond());
+        System.out.println(emptyPair.equals(Pair.of(null, null)));
+
+        // Проверяем корректность hashCode
+        System.out.println("pair: " + pair.hashCode());
+        System.out.println("pair2: " + pair2.hashCode());
 
     }
 

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

@@ -2,34 +2,74 @@
 
 import java.io.File;
 import java.io.Serializable;
+import java.io.*;
 import java.util.AbstractList;
+import java.util.ArrayList;
 
-public class SavedList<E extends Serializable> extends AbstractList<E> {
-
-    public SavedList(File file) {
+public class SavedList<E extends Serializable> extends AbstractList<E>
+{
+    private File DiskList;
+    private ArrayList<E> ArrList = new ArrayList<E>();
+    public SavedList(File file)
+    {
+        DiskList = file;
+        try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file)))
+        {
+            ArrList = (ArrayList<E>) ois.readObject();
+        } catch (Exception e)
+        {
+            System.out.println(e.getMessage());
+        }
     }
 
     @Override
-    public E get(int index) {
-        return null;
+    public E get(int index)
+    {
+        E sv = ArrList.get(index);
+        return sv;
     }
 
     @Override
-    public E set(int index, E element) {
-        return null;
+    public E set(int index, E element)
+    {
+        E sv = ArrList.set(index, element);
+        ListWrite();
+        return sv;
     }
 
     @Override
-    public int size() {
-        return 0;
+    public int size()
+    {
+        int sv = ArrList.size();
+        return sv;
     }
 
     @Override
-    public void add(int index, E element) {
+    public void add(int index, E element)
+    {
+        ArrList.add(index,element);
+        ListWrite();
     }
 
     @Override
-    public E remove(int index) {
-        return null;
+    public E remove(int index)
+    {
+        E sv = ArrList.remove(index);
+        ListWrite();
+        return sv;
+    }
+
+    public void ListWrite()
+    {
+        if(DiskList.exists())
+        {
+            DiskList.delete();
+        }
+        try (ObjectOutputStream ois = new ObjectOutputStream(new FileOutputStream(DiskList))) {
+            ois.writeObject(ArrList);
+        } catch (Exception e)
+        {
+            System.out.println(e.getMessage());
+        }
     }
-}
+}

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

@@ -1,11 +1,8 @@
 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.*;
 
 public class Task03Main {
 
@@ -18,7 +15,70 @@ public static void main(String[] args) throws IOException {
 
     }
 
-    public static List<Set<String>> findAnagrams(InputStream inputStream, Charset charset) {
-        return null;
+    public static List<Set<String>> findAnagrams(InputStream inputStream, Charset charset)
+    {
+        List<Set<String>> group = new ArrayList<>();
+        Map<String, Set<String>> anagramMap = new HashMap<>();
+
+        try (BufferedReader buffer = new BufferedReader(new InputStreamReader(inputStream, charset)))
+        {
+            String string;
+            while ((string = buffer.readLine()) != null)
+            {
+                String word = string.toLowerCase();
+                String wordSorted = sortCharacters(word);
+
+                if(wordSorted.length() < 3 || !wordSorted.matches("[а-яё]+"))
+                    continue;
+
+                if (!anagramMap.containsKey(wordSorted))
+                {
+                    SortedSet<String> anagramGroup = new TreeSet<>();
+                    anagramGroup.add(word);
+                    group.add(anagramGroup);
+                    anagramMap.put(wordSorted, anagramGroup);
+                } else
+                {
+                    Set<String> anagramGroup = anagramMap.get(wordSorted);
+                    anagramGroup.add(word);
+                }
+            }
+        } catch (IOException e)
+        {
+            e.printStackTrace();
+        }
+
+        Filter(group);
+        sortAnagrams(group);
+
+        return group;
+    }
+
+    public static void Filter(List<Set<String>> collection)
+    {
+        Iterator<Set<String>> it = collection.listIterator();
+        while(it.hasNext())
+        {
+            Set<String> set = it.next();
+            if(set.size() <= 1)
+                it.remove();
+        }
+    }
+
+    public static void sortAnagrams(List<Set<String>> anagramGroups)
+    {
+        anagramGroups.sort(Comparator.comparing(Task03Main::getFirstElement));
+    }
+
+    private static String getFirstElement(Set<String> set)
+    {
+        return set.stream().findFirst().orElse("");
+    }
+
+    private static String sortCharacters(String word)
+    {
+        char[] charArray = word.toLowerCase().toCharArray();
+        Arrays.sort(charArray);
+        return new String(charArray);
     }
-}
+}