Ирина Бычевская ПрИ-201 Модуль 9

task01/README.md

@@ -7,5 +7,6 @@
 
 - Реализуйте статический фабричный метод of(). Конструктор должен быть закрытым (private). 
 
-- Реализуйте метод ifPresent, аналогичный одноименному методу класса Optional и принимающий java.util.function.BiConsumer, **обязательно типизируйте BiConsumer**
+- Реализуйте метод ifPresent, аналогичный одноименному методу класса Optional и принимающий java.util.function.BiConsumer, 
+- **обязательно типизируйте BiConsumer**
 

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

@@ -1,5 +1,50 @@
 package com.example.task01;
 
-public class Pair {
-    // TODO напишите реализацию
-}
+import java.util.Objects;
+import java.util.function.BiConsumer;
+
+    public class Pair<T, K> {
+        private final T first;
+        private final K second;
+
+        private Pair(T first, K second){
+            this.first = first;
+            this.second = second;
+        }
+
+        public static <T, K> Pair<T, K> of(T first, K second){
+            return new Pair<>(first, second);
+        }
+
+        public T getFirst(){
+            return first;
+        }
+
+        public K getSecond(){
+            return second;
+        }
+
+        public void ifPresent(BiConsumer<? super T, ? super K> consumer) {
+            if (first != null && second != null)
+                consumer.accept(first, second);
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            if (this == obj) {
+                return true;
+            }
+
+            if (!(obj instanceof Pair)) {
+                return false;
+            }
+
+            Pair<?, ?> other = (Pair<?, ?>) obj;
+            return Objects.equals(first, other.first) && Objects.equals(second, other.second);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(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 +21,8 @@ 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);
 
     }
 

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

@@ -1,35 +1,72 @@
 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 = (List<E>) stream.readObject();
+            list.clear();
+            list.addAll(loadedList);
+        } catch (IOException | ClassNotFoundException e) {
+            throw new RuntimeException("Error loading data from 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;
     }
-}
+
+}

task02/src/com/example/task02/Task02Main.java

@@ -6,16 +6,27 @@
 public class Task02Main {
 
     public static void main(String[] args) throws IOException {
+        File file = new File("savedlist_test.bin");
 
-        File file = new File("./testlist.dat");
+        SavedList<String> list = new SavedList<>(file);
 
-        SavedList<String> list1 = new SavedList<>(file);
-        list1.add("Z");
-        System.out.println("list1: " + list1);
+        // Добавляем
+        list.add("A");
+        list.add("B");
+        list.add(0, "Start");
+        System.out.println(list);
 
-        SavedList<String> list2 = new SavedList<>(file);
-        System.out.println("list2: " + list2);
+        // Замена
+        list.set(1, "X");
+        System.out.println(list);
 
+        // Удаление
+        list.remove(0);
+        System.out.println(list);
+
+        // Проверка загрузки из файла
+        SavedList<String> newList = new SavedList<>(file);
+        System.out.println(newList);
     }
 
 }

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

@@ -1,24 +1,39 @@
 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.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.*;
+import java.util.stream.Collectors;
 
 public class Task03Main {
 
     public static void main(String[] args) throws IOException {
-
-        List<Set<String>> anagrams = findAnagrams(new FileInputStream("task03/resources/singular.txt"), Charset.forName("windows-1251"));
+        List<Set<String>> anagrams = findAnagrams(Files.newInputStream(Paths.get("task03/resources/singular.txt")), Charset.forName("windows-1251"));
         for (Set<String> anagram : anagrams) {
             System.out.println(anagram);
         }
 
     }
 
     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());
     }
 }