Савилов ПрИ-202. Модуль 9

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

@@ -1,5 +1,44 @@
 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)
+            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);
+    }
 }

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"
@@ -21,7 +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

@@ -1,35 +1,70 @@
 package com.example.task02;
 
-import java.io.File;
-import java.io.Serializable;
+import java.io.*;
 import java.util.AbstractList;
+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 +1,8 @@
 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 {
 
@@ -19,6 +16,58 @@ public static void main(String[] args) throws IOException {
     }
 
     public static List<Set<String>> findAnagrams(InputStream inputStream, Charset charset) {
-        return null;
+        if (!charset.isRegistered()) {
+            throw new IllegalArgumentException();
+        }
+
+        Map<String, Set<String>> map = new HashMap<>();
+        Set<String> uniqueWords = new HashSet<>();
+
+        try (BufferedReader br = new BufferedReader(new InputStreamReader(inputStream, charset))) {
+            String line;
+            while ((line = br.readLine()) != null) {
+                line = line.trim().toLowerCase();
+
+                if (isValidLine(line)) {
+                    uniqueWords.add(line);
+                }
+            }
+        } catch (IOException ioe) {
+            ioe.printStackTrace();
+        }
+
+        for (String word : uniqueWords) {
+            char[] chars = word.toCharArray();
+            Arrays.sort(chars);
+            String key = new String(chars);
+
+            map.computeIfAbsent(key, k -> new TreeSet<>()).add(word);
+        }
+
+        List<Set<String>> result = new ArrayList<>();
+
+        for (Set<String> group : map.values()) {
+            if (group.size() >= 2) {
+                result.add(group);
+            }
+        }
+
+        result.sort(Comparator.comparing(set -> set.iterator().next()));
+
+        return result;
+    }
+
+    private static boolean isValidLine(String line) {
+        if (line.length() < 3) {
+            return false;
+        }
+
+        for (char ch : line.toCharArray()) {
+            if (!((ch >= 'а' && ch <= 'я') || ch == 'ё')) {
+                return false;
+            }
+        }
+
+        return true;
     }
 }