Коноплёва Анна. Модуль 9

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

@@ -1,5 +1,42 @@
 package com.example.task01;
 
-public class Pair {
-    // TODO напишите реализацию
+import java.util.Objects;
+import java.util.function.BiConsumer;
+public class Pair<F, S> {
+    private final F FirstValue;
+    private final S SecondValue;
+
+    private Pair(F firstValue, S secondValue) {
+        FirstValue = firstValue;
+        SecondValue = secondValue;
+    }
+
+    public static <F, S> Pair<F, S> of(F firstValue, S secondValue) {
+        return new Pair<>(firstValue, secondValue);
+    }
+
+    public F getFirst() {
+        return FirstValue;
+    }
+
+    public S getSecond() {
+        return SecondValue;
+    }
+
+    public void ifPresent(BiConsumer<? super F, ? super S> biConsumer) {
+        if (FirstValue != null && SecondValue != null) biConsumer.accept(FirstValue, SecondValue);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) return true;
+        if (obj == null || this.getClass() != obj.getClass()) return false;
+        Pair<?, ?> pair = (Pair<?, ?>) obj;
+        return Objects.equals(FirstValue, pair.FirstValue) && Objects.equals(SecondValue, pair.SecondValue);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(FirstValue, SecondValue);
+    }
 }

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 +21,9 @@ 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 +1,56 @@
 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> {
+    private final File file;
+    private List<E> list;
 
     public SavedList(File file) {
+        this.file = file;
+        if (file.exists()) {
+            try (ObjectInputStream is = new ObjectInputStream(new FileInputStream(file))) {
+                list = (ArrayList<E>) is.readObject();
+            } catch (Exception ignored) { }
+        } else {
+            list = new ArrayList<>();
+        }
     }
 
     @Override
     public E get(int index) {
-        return null;
+        return list.get(index);
     }
 
     @Override
     public E set(int index, E element) {
-        return null;
+        E el = list.set(index, element);
+        writeFile();
+        return el;
     }
 
     @Override
-    public int size() {
-        return 0;
-    }
+    public int size() {return list.size();}
 
     @Override
     public void add(int index, E element) {
+        list.add(index, element);
+        writeFile();
     }
 
     @Override
     public E remove(int index) {
-        return null;
+        E el = list.remove(index);
+        writeFile();
+        return el;
+    }
+    private void writeFile() {
+        try (ObjectOutputStream obj = new ObjectOutputStream(new FileOutputStream(file))) {
+            obj.writeObject(list);
+        } catch (IOException ignored) {
+        }
     }
 }

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 +17,23 @@ 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());
     }
+
 }