Воронцова Валерия ПрИ-201

task01/src/com/example/task01/Task01Main.java

@@ -1,29 +1,29 @@
 package com.example.task01;
 
 import java.io.IOException;
+import java.util.Objects;
 import java.util.function.Function;
 import java.util.function.Predicate;
 
 public class Task01Main {
     public static void main(String[] args) throws IOException {
 
-        // TODO С корректно реализованным методом ternaryOperator должен компилироваться и успешно работать следующий код:
 
-        /*
         Predicate<Object> condition = Objects::isNull;
         Function<Object, Integer> ifTrue = obj -> 0;
         Function<CharSequence, Integer> ifFalse = CharSequence::length;
         Function<String, Integer> safeStringLength = ternaryOperator(condition, ifTrue, ifFalse);
-        */
 
     }
 
     public static <T, U> Function<T, U> ternaryOperator(
             Predicate<? super T> condition,
             Function<? super T, ? extends U> ifTrue,
             Function<? super T, ? extends U> ifFalse) {
-
-        return null; // your implementation here
+            if (condition == null || ifTrue == null || ifFalse == null){
+                throw new NullPointerException();
+            }
+            return t -> condition.test(t) ? ifTrue.apply(t) : ifFalse.apply(t);
 
     }
 }

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

@@ -6,18 +6,21 @@ public class Task02Main {
 
     public static void main(String[] args) {
 
-        /*
         cycleGrayCode(2)
                 .limit(10)
                 .forEach(System.out::println);
-        */
+
 
     }
 
     public static IntStream cycleGrayCode(int n) {
+        if (n < 1 || n > 16) throw new IllegalArgumentException();
+        return IntStream.iterate(0, i -> i + 1).map(i -> grayCodeFromBinary(i % (int) Math.pow(2, n)));
 
-        return null; // your implementation here
+    }
 
+    public static int grayCodeFromBinary(int g) {
+        return g ^ (g >> 1);
     }
 
 }

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

@@ -1,6 +1,7 @@
 package com.example.task03;
 
 import java.util.Comparator;
+import java.util.Iterator;
 import java.util.function.BiConsumer;
 import java.util.stream.Stream;
 
@@ -22,6 +23,28 @@ public static <T> void findMinMax(
             Comparator<? super T> order,
             BiConsumer<? super T, ? super T> minMaxConsumer) {
 
-        // your implementation here
+        if (stream == null || order == null || minMaxConsumer == null) {
+            throw new NullPointerException();
+        }
+
+        Iterator<? extends T> iterator = stream.iterator();
+
+        if (!iterator.hasNext()) {
+            minMaxConsumer.accept(null, null);
+        } else {
+            T min = iterator.next();
+            T max = min;
+
+            while (iterator.hasNext()) {
+                T current = iterator.next();
+                if (order.compare(current, min) < 0) {
+                    min = current;
+                } else if (order.compare(current, max) > 0) {
+                    max = current;
+                }
+            }
+
+            minMaxConsumer.accept(min, max);
+        }
     }
 }

task04/src/com/example/task04/Task04Main.java

@@ -1,11 +1,28 @@
 package com.example.task04;
 
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.util.Comparator;
+import java.util.Map;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
 public class Task04Main {
 
     public static void main(String[] args) {
-
-        // your implementation here
+        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
+        reader.lines()
+                .flatMap(x -> Stream.of(x.split("\\P{L}"))
+                        .filter(t -> !t.isEmpty())
+                        .map(String::toLowerCase))
+                .collect(Collectors.groupingBy(t -> t, Collectors.counting()))
+                .entrySet()
+                .stream()
+                .sorted(Map.Entry.comparingByKey())
+                .sorted(Map.Entry.comparingByValue(Comparator.reverseOrder()))
+                .limit(10)
+                .map(Map.Entry::getKey)
+                .forEach(t -> System.out.print(t + '\n'));
 
     }
-
 }

task05/src/com/example/task05/MailMessage.java

@@ -0,0 +1,28 @@
+package com.example.task05;
+
+public class MailMessage implements Message<String> {
+    private final String from;
+    private final String to;
+    private final String content;
+
+    public MailMessage(String from, String to, String content) {
+        this.from = from;
+        this.to = to;
+        this.content = content;
+    }
+
+    @Override
+    public String getFrom() {
+        return from;
+    }
+
+    @Override
+    public String getTo() {
+        return to;
+    }
+
+    @Override
+    public String getContent() {
+        return content;
+    }
+}

task05/src/com/example/task05/MailService.java

@@ -0,0 +1,30 @@
+package com.example.task05;
+
+import java.util.*;
+import java.util.function.Consumer;
+
+public class MailService<T> implements Consumer<Message<T>> {
+    private final Map<String, List<T>> mailBox = new HashMap<>();
+
+    @Override
+    public void accept(Message<T> mail) {
+        mailBox.computeIfAbsent(mail.getTo(), k -> new ArrayList<>()).add(mail.getContent());
+    }
+
+    public Map<String, List<T>> getMailBox() {
+        return new AbstractMap<String, List<T>>() {
+            @Override
+            public Set<Entry<String, List<T>>> entrySet() {
+                return Collections.emptySet();
+            }
+
+            @Override
+            public List<T> get(Object key) {
+                List<T> result = mailBox.get(key);
+                return result != null ? result : Collections.emptyList();
+            }
+        };
+    }
+}
+
+

task05/src/com/example/task05/Message.java

@@ -0,0 +1,7 @@
+package com.example.task05;
+
+public interface Message<T> {
+    String getFrom();
+    String getTo();
+    T getContent();
+}

task05/src/com/example/task05/Salary.java

@@ -0,0 +1,28 @@
+package com.example.task05;
+
+public class Salary implements Message<Integer> {
+    private final String from;
+    private final String to;
+    private final Integer content;
+
+    public Salary(String from, String to, Integer content) {
+        this.from = from;
+        this.to = to;
+        this.content = content;
+    }
+
+    @Override
+    public String getFrom() {
+        return from;
+    }
+
+    @Override
+    public String getTo() {
+        return to;
+    }
+
+    @Override
+    public Integer getContent() {
+        return content;
+    }
+}

task05/src/com/example/task05/Task05Main.java

@@ -9,8 +9,6 @@ public class Task05Main {
 
     public static void main(String[] args) {
 
-        /*
-
         // Random variables
         String randomFrom = "..."; // Некоторая случайная строка. Можете выбрать ее самостоятельно.
         String randomTo = "...";  // Некоторая случайная строка. Можете выбрать ее самостоятельно.
@@ -87,8 +85,7 @@ public static void main(String[] args) {
         assert salaries.get(salary2.getTo()).equals(Arrays.asList(Integer.MAX_VALUE)) : "wrong salaries mailbox content (2)";
         assert salaries.get(randomTo).equals(Arrays.asList(randomSalary)) : "wrong salaries mailbox content (3)";
 
-
-        */
+        System.out.println(salary2);
 
     }