Плотников Георгий ПрИ-202 — Лабораторная 9

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

@@ -1,5 +1,49 @@
 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 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<?, ?> pairedObj = (Pair<?, ?>) obj;
+        return Objects.equals(first, pairedObj.first) &&
+               Objects.equals(second, pairedObj.second);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(first, second);
+    }
+
+    public static <T, U> Pair<T, U> of(T first, U second) {
+        return new Pair<>(first, second);
+    }
+
+    public void ifPresent(BiConsumer<? super T, ? super U> consumer) {
+        if (first != null && second != null) {
+            consumer.accept(first, second);
+        }
+    }
 }

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

@@ -8,7 +8,6 @@ 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"
@@ -21,8 +20,6 @@ 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

@@ -3,33 +3,70 @@
 import java.io.File;
 import java.io.Serializable;
 import java.util.AbstractList;
+import java.io.*;
+import java.util.ArrayList;
+import java.util.List;
 
-public class SavedList<E extends Serializable> extends AbstractList<E> {
+public class SavedList<T extends Serializable> extends AbstractList<T> {
+    private final File file;
+    private final List<T> list;
 
     public SavedList(File file) {
+        this.file = file;
+        this.list = new ArrayList<>();
+
+        if (file.exists() && file.length() > 0) {
+            try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file))) {
+                List<T> loadedList = (List<T>) ois.readObject();
+                list.addAll(loadedList);
+            } catch (IOException | ClassNotFoundException e) {
+                System.err.println("Ошибка загрузки: " + e.getMessage());
+            }
+        }
+    }
+
+    private void saveToFile() {
+        try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(file))) {
+            oos.writeObject(new ArrayList<>(list));
+        } catch (IOException e) {
+            System.err.println("Ошибка сохранения: " + e.getMessage());
+        }
     }
 
     @Override
-    public E get(int index) {
-        return null;
+    public T get(int index) {
+        return list.get(index);
     }
 
     @Override
-    public E set(int index, E element) {
-        return null;
+    public T set(int index, T element) {
+        T oldElement = list.set(index, element);
+        saveToFile();
+        return oldElement;
     }
 
     @Override
     public int size() {
-        return 0;
+        return list.size();
+    }
+
+    @Override
+    public void add(int index, T element) {
+        list.add(index, element);
+        saveToFile();
     }
 
     @Override
-    public void add(int index, E element) {
+    public boolean add(T element) {
+        boolean result = list.add(element);
+        saveToFile();
+        return result;
     }
 
     @Override
-    public E remove(int index) {
-        return null;
+    public T remove(int index) {
+        T removedElement = list.remove(index);
+        saveToFile();
+        return removedElement;
     }
 }

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

@@ -1,11 +1,11 @@
 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.Arrays;
 import java.util.List;
 import java.util.Set;
+import java.util.*;
 
 public class Task03Main {
 
@@ -19,6 +19,49 @@ public static void main(String[] args) throws IOException {
     }
 
     public static List<Set<String>> findAnagrams(InputStream inputStream, Charset charset) {
-        return null;
+        Map<String, Set<String>> anagramMap = new HashMap<>();
+
+        readAndProcessWords(inputStream, charset, anagramMap);
+
+        return createSortedResult(anagramMap);
+    }
+
+    private static void readAndProcessWords(InputStream inputStream, Charset charset,
+                                            Map<String, Set<String>> anagramMap) {
+        try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, charset))) {
+            reader.lines()
+                    .map(String::trim)
+                    .map(String::toLowerCase)
+                    .filter(word -> word.length() >= 3)
+                    .filter(Task03Main::isValidRussianWord)
+                    .forEach(word -> {
+                        String key = getSortedLetters(word);
+                        anagramMap.computeIfAbsent(key, k -> new TreeSet<>()).add(word);
+                    });
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private static List<Set<String>> createSortedResult(Map<String, Set<String>> anagramMap) {
+        return anagramMap.values().stream()
+                .filter(group -> group.size() >= 2)
+                .sorted(Comparator.comparing(group -> group.iterator().next()))
+                .collect(ArrayList::new, ArrayList::add, ArrayList::addAll);
+    }
+
+    private static boolean isValidRussianWord(String word) {
+        return word.chars().allMatch(Task03Main::isRussianLetter);
+    }
+
+    private static boolean isRussianLetter(int codePoint) {
+        char c = (char) codePoint;
+        return (c >= 'а' && c <= 'я') || c == 'ё';
+    }
+
+    private static String getSortedLetters(String word) {
+        char[] letters = word.toCharArray();
+        Arrays.sort(letters);
+        return new String(letters);
     }
 }