Симоненко Леонид. Задачи 9.1 - 9.3.

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

@@ -1,5 +1,42 @@
 package com.example.task01;
+import java.util.Objects;
+import java.util.function.BiConsumer;
 
-public class Pair {
-    // TODO напишите реализацию
+public class Pair<T1, T2>  {
+    private final T1 firstValue;
+    private final T2 secondValue;
+
+    private Pair(T1 firstValue, T2 secondValue) {
+        this.firstValue = firstValue;
+        this.secondValue = secondValue;
+    }
+
+    public static <T1, T2> Pair<T1, T2> of (T1 firstValue, T2 secondValue) {
+        return new Pair<>(firstValue, secondValue);
+    }
+
+    public T1 getFirst() {
+        return firstValue;
+    }
+
+    public T2 getSecond() {
+        return secondValue;
+    }
+
+    public void ifPresent(BiConsumer biConsumer) {
+        if (this.firstValue != null && this.secondValue != null) biConsumer.accept(this.firstValue, this.secondValue);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || this.getClass() != o.getClass()) return false;
+        Pair<T1, T2> pair = (Pair<T1, T2>) o;
+        return this.firstValue.equals(pair.firstValue) && this.secondValue.equals(pair.secondValue);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(this.firstValue, this.secondValue);
+    }
 }

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 +20,9 @@ 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 +1,60 @@
 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;
 import java.util.AbstractList;
 
 public class SavedList<E extends Serializable> extends AbstractList<E> {
-
+    private List<E> savedList = new ArrayList<>();
+    private final File file;
     public SavedList(File file) {
+        if (file.exists()){
+            try (ObjectInputStream objectInputStream = new ObjectInputStream(Files.newInputStream(file.toPath()))){
+                this.savedList = (List<E>) objectInputStream.readObject();
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+        }
+        this.file = file;
     }
 
+    private void writeFile() {
+        try (ObjectOutputStream objectOutputStream = new ObjectOutputStream(Files.newOutputStream(file.toPath()))){
+            objectOutputStream.writeObject(this.savedList);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
     @Override
     public E get(int index) {
-        return null;
+        return this.savedList.get(index);
     }
 
     @Override
     public E set(int index, E element) {
-        return null;
+        E result = this.savedList.set(index, element);
+        this.writeFile();
+        return result;
     }
 
     @Override
     public int size() {
-        return 0;
+        return savedList.size();
     }
 
     @Override
     public void add(int index, E element) {
+        savedList.add(index, element);
+        this.writeFile();
     }
 
     @Override
     public E remove(int index) {
-        return null;
+        E result = this.savedList.remove(index);
+        this.writeFile();
+        return result;
     }
 }

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 +17,27 @@ public static void main(String[] args) throws IOException {
     }
 
     public static List<Set<String>> findAnagrams(InputStream inputStream, Charset charset) {
-        return null;
+        Map<String, Set<String>> treeMap = new TreeMap<>();
+
+        try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, charset))){
+            List<String> inputs = bufferedReader.lines()
+                    .map(String::toLowerCase)
+                    .filter(x -> x.matches("[а-я]+"))
+                    .filter(x -> x.length() >= 3)
+                    .collect(Collectors.toList());
+            for (String input : inputs) {
+                char[] chars = input.toCharArray();
+                Arrays.sort(chars);
+                String key = new String(chars);
+                treeMap.computeIfAbsent(key, set -> new TreeSet<>()).add(input);
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+        return treeMap.values()
+                .stream()
+                .filter(set -> set.size() >= 2)
+                .collect(Collectors.toList());
     }
 }