diff --git a/task01/src/com/example/task01/Task01Main.java b/task01/src/com/example/task01/Task01Main.java index de4599c1..b4a84edb 100644 --- a/task01/src/com/example/task01/Task01Main.java +++ b/task01/src/com/example/task01/Task01Main.java @@ -1,20 +1,18 @@ 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 condition = Objects::isNull; Function ifTrue = obj -> 0; Function ifFalse = CharSequence::length; Function safeStringLength = ternaryOperator(condition, ifTrue, ifFalse); - */ } @@ -22,8 +20,10 @@ public static Function ternaryOperator( Predicate condition, Function ifTrue, Function 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); } } diff --git a/task02/src/com/example/task02/Task02Main.java b/task02/src/com/example/task02/Task02Main.java index 309260d8..0a4082a9 100644 --- a/task02/src/com/example/task02/Task02Main.java +++ b/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); } } diff --git a/task03/src/com/example/task03/Task03Main.java b/task03/src/com/example/task03/Task03Main.java index 254d5cb0..ab36e755 100644 --- a/task03/src/com/example/task03/Task03Main.java +++ b/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 void findMinMax( Comparator order, BiConsumer minMaxConsumer) { - // your implementation here + if (stream == null || order == null || minMaxConsumer == null) { + throw new NullPointerException(); + } + + Iterator 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); + } } } diff --git a/task04/src/com/example/task04/Task04Main.java b/task04/src/com/example/task04/Task04Main.java index 1e38e6eb..42d4e9f7 100644 --- a/task04/src/com/example/task04/Task04Main.java +++ b/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')); } - } diff --git a/task05/src/com/example/task05/MailMessage.java b/task05/src/com/example/task05/MailMessage.java new file mode 100644 index 00000000..1472b303 --- /dev/null +++ b/task05/src/com/example/task05/MailMessage.java @@ -0,0 +1,28 @@ +package com.example.task05; + +public class MailMessage implements Message { + 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; + } +} diff --git a/task05/src/com/example/task05/MailService.java b/task05/src/com/example/task05/MailService.java new file mode 100644 index 00000000..4324c642 --- /dev/null +++ b/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 implements Consumer> { + private final Map> mailBox = new HashMap<>(); + + @Override + public void accept(Message mail) { + mailBox.computeIfAbsent(mail.getTo(), k -> new ArrayList<>()).add(mail.getContent()); + } + + public Map> getMailBox() { + return new AbstractMap>() { + @Override + public Set>> entrySet() { + return Collections.emptySet(); + } + + @Override + public List get(Object key) { + List result = mailBox.get(key); + return result != null ? result : Collections.emptyList(); + } + }; + } +} + + diff --git a/task05/src/com/example/task05/Message.java b/task05/src/com/example/task05/Message.java new file mode 100644 index 00000000..6f1665af --- /dev/null +++ b/task05/src/com/example/task05/Message.java @@ -0,0 +1,7 @@ +package com.example.task05; + +public interface Message { + String getFrom(); + String getTo(); + T getContent(); +} diff --git a/task05/src/com/example/task05/Salary.java b/task05/src/com/example/task05/Salary.java new file mode 100644 index 00000000..0bc7fbb9 --- /dev/null +++ b/task05/src/com/example/task05/Salary.java @@ -0,0 +1,28 @@ +package com.example.task05; + +public class Salary implements Message { + 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; + } +} diff --git a/task05/src/com/example/task05/Task05Main.java b/task05/src/com/example/task05/Task05Main.java index ae31f6bc..f0f61ac0 100644 --- a/task05/src/com/example/task05/Task05Main.java +++ b/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); }