Захаров Данила. Модуль 09

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

@@ -1,5 +1,53 @@
 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;
+
+     public 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<T, U>(first, second);
+     }
+
+    public void ifPresent(BiConsumer<? super T, ? super U> consumer) {
+        if (first != null && second != null) {
+            consumer.accept(first, second);
+        }
+    }
+
+    public T getFirst() {
+         return first;
+    }
+    public U getSecond() {
+         return 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

@@ -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 +21,25 @@ 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!
-        */
+
+        System.out.println(mustBeTrue);
+        System.out.println(mustAlsoBeTrue);
+
+
+
+        Pair<String, String> pair3 = Pair.of("Hello", "World");
+        System.out.println(pair3);
+
+        // Использование ifPresent для выполнения действия, если значения не null
+        pair3.ifPresent((first, second) -> System.out.println(first + " " + second));
+
+        // с числом и строкой
+        Pair<Integer, String> mixedPair = Pair.of(42, "Answer");
+        System.out.println(mixedPair);
+
+        // null
+        Pair<String, Integer> nullPair = Pair.of(null, 10);
+        nullPair.ifPresent((first, second) -> System.out.println(first + " " + second));  // Ничего не произойдёт, так как first == null
 
     }
 

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;
+import java.util.Map;
 
-public class SavedList<E extends Serializable> extends AbstractList<E> {
+public class SavedList<E extends List> extends AbstractList<E> {
+    private final List<E> list;
+    private final File file;
 
     public SavedList(File file) {
+        this.file = file;
+        this.list = loadFromFile();
     }
 
     @Override
     public E get(int index) {
-        return null;
+        return list.get(index);
     }
 
     @Override
     public E set(int index, E element) {
-        return null;
+        E oldValue = list.set(index, element);
+        saveToFile();
+        return oldValue;
     }
 
     @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;
+    }
+
+    private void saveToFile() {
+        try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(file))) {
+            oos.writeObject(list);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    // Метод для загрузки списка из файла
+    @SuppressWarnings("unchecked")
+    private List<E> loadFromFile() {
+        if (!file.exists()) {
+            return new ArrayList<>();
+        }
+
+        try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file))) {
+            return (List<E>) ois.readObject();
+        } catch (IOException | ClassNotFoundException e) {
+            e.printStackTrace();
+            return new ArrayList<>();
+        }
     }
 }

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 +17,24 @@ 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 br = new BufferedReader(new InputStreamReader(inputStream, charset))) {
+            List<String> entries = br.lines()
+                    .map(String::toLowerCase)
+                    .filter(x -> x.matches("[а-яё]+") && x.length() >= 3)
+                    .collect(Collectors.toList());
+            for (String s : entries) {
+                char[] symbols = s.toCharArray();
+                Arrays.sort(symbols);
+                String key = new String(symbols);
+                result.computeIfAbsent(key, a -> new TreeSet<>()).add(s);
+            }
+        } catch (IOException ignored) { }
+
+        return result.values()
+                .stream()
+                .filter(x -> x.size() >= 2)
+                .collect(Collectors.toList());
     }
 }