diff --git a/task01/README.md b/task01/README.md index 75cee25b..0674c273 100644 --- a/task01/README.md +++ b/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** diff --git a/task01/src/com/example/task01/Pair.java b/task01/src/com/example/task01/Pair.java index f6fb603b..12958f91 100644 --- a/task01/src/com/example/task01/Pair.java +++ b/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 { + private final T first; + private final K second; + + private Pair(T first, K second){ + this.first = first; + this.second = second; + } + + public static Pair of(T first, K second){ + return new Pair<>(first, second); + } + + public T getFirst(){ + return first; + } + + public K getSecond(){ + return second; + } + + public void ifPresent(BiConsumer 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); + } + } \ No newline at end of file diff --git a/task01/src/com/example/task01/Task01Main.java b/task01/src/com/example/task01/Task01Main.java index 54dde94f..d345e34c 100644 --- a/task01/src/com/example/task01/Task01Main.java +++ b/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 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 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); } diff --git a/task02/src/com/example/task02/SavedList.java b/task02/src/com/example/task02/SavedList.java index 6b3a037d..1a7a497f 100644 --- a/task02/src/com/example/task02/SavedList.java +++ b/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 extends AbstractList { + private final File file; + private final List 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 loadedList = (List) 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; } -} + +} \ No newline at end of file diff --git a/task02/src/com/example/task02/Task02Main.java b/task02/src/com/example/task02/Task02Main.java index dedc9f91..01827221 100644 --- a/task02/src/com/example/task02/Task02Main.java +++ b/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 list = new SavedList<>(file); - SavedList 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 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 newList = new SavedList<>(file); + System.out.println(newList); } } diff --git a/task03/src/com/example/task03/Task03Main.java b/task03/src/com/example/task03/Task03Main.java index 7f255e98..e9a89c76 100644 --- a/task03/src/com/example/task03/Task03Main.java +++ b/task03/src/com/example/task03/Task03Main.java @@ -1,17 +1,16 @@ 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> anagrams = findAnagrams(new FileInputStream("task03/resources/singular.txt"), Charset.forName("windows-1251")); + List> anagrams = findAnagrams(Files.newInputStream(Paths.get("task03/resources/singular.txt")), Charset.forName("windows-1251")); for (Set anagram : anagrams) { System.out.println(anagram); } @@ -19,6 +18,22 @@ public static void main(String[] args) throws IOException { } public static List> findAnagrams(InputStream inputStream, Charset charset) { - return null; + Map> result = new TreeMap<>(); + try (BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, charset))) { + List 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()); } }