Доманина при-201 9модуль

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

@@ -1,5 +1,43 @@
 package com.example.task01;
 
-public class Pair {
-    // TODO напишите реализацию
+import java.util.Objects;
+import java.util.function.BiConsumer;
+
+public class Pair<T, U> {
+    private final T first;
+    private final U second;
+
+    private Pair(T first, U second) {
+        this.first = first;
+        this.second = second;
+    }
+
+    public static <T, U> Pair<T, U> of(T first, U second) {
+        return new Pair<>(first, second);
+    }
+
+    public T getFirst() {
+        return first;
+    }
+
+    public U getSecond() {
+        return 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);
+    }
+
+    public void ifPresent(BiConsumer<? super T, ? super U> biConsumer) {
+        if (first != null && second != null) biConsumer.accept(first, second);
+    }
 }

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

@@ -8,7 +8,7 @@ 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"
@@ -21,7 +21,7 @@ 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 +1,66 @@
 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;
+import java.util.List;
 
 public class SavedList<E extends Serializable> extends AbstractList<E> {
+    private final File file;
+    private final List<E> list = new ArrayList<>();
 
     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")
+            List<E> loadedList = (ArrayList<E>) stream.readObject();
+            list.clear();
+            list.addAll(loadedList);
+        } catch (IOException | ClassNotFoundException e) {
+            throw new RuntimeException("Error downloading data from a file", e);
+        }
+    }
+
+    private void saveToFile() {
+        try (ObjectOutputStream stream = new ObjectOutputStream(Files.newOutputStream(file.toPath()))) {
+            stream.writeObject(list);
+        } catch (IOException e) {
+            throw new RuntimeException("Error saving data to file", e);
+        }
+    }
     @Override
     public E get(int index) {
-        return null;
+        return list.get(index);
     }
 
     @Override
     public E set(int index, E element) {
-        return null;
+        E oldElement = list.set(index, element);
+        saveToFile();
+        return oldElement;
     }
 
     @Override
     public int size() {
-        return 0;
+        return list.size();
     }
 
     @Override
     public void add(int index, E element) {
+        list.add(index, element);
+        saveToFile();
     }
 
     @Override
     public E remove(int index) {
-        return null;
+        E removedElement = list.remove(index);
+        saveToFile();
+        return removedElement;
     }
 }

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

@@ -1,11 +1,9 @@
 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 {
 
@@ -19,6 +17,22 @@ public static void main(String[] args) throws IOException {
     }
 
     public static List<Set<String>> findAnagrams(InputStream inputStream, Charset charset) {
-        return null;
+        Map<String, TreeSet<String>> result = new TreeMap<>();
+        try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, charset))) {
+            List<String> lines = reader.lines()
+                    .map(String::toLowerCase)
+                    .filter(str -> str.matches("[а-яё]+") && str.length() >= 3)
+                    .collect(Collectors.toList());
+            for (String line : lines) {
+                char[] symbols = line.toCharArray();
+                Arrays.sort(symbols);
+                String key = new String(symbols);
+                result.computeIfAbsent(key, value -> new TreeSet<>()).add(line);
+            }
+        } catch (IOException e) { }
+        return result.values()
+                .stream()
+                .filter(value -> value.size() >= 2)
+                .collect(Collectors.toList());
     }
 }