starts with lesson 43

src/com/walking/lesson14_polymorphism/task1/Main.java

@@ -1,16 +1,46 @@
 package com.walking.lesson14_polymorphism.task1;
 
+import com.walking.lesson14_polymorphism.task1.figure.RegularFigure;
+import com.walking.lesson14_polymorphism.task1.figure.Square;
+import com.walking.lesson14_polymorphism.task1.figure.Triangle;
+
+import java.util.Scanner;
+
 /**
  * Реализуйте класс «Правильная фигура».
  * Для него создайте классы-наследники «Треугольник» и «Квадрат».
  * <p>
- * Пользователь должен иметь возможность ввести длину стороны и выбрать тип фигуры.
- * Программа должна нарисовать в консоли выбранную пользователем фигуру,
- * используя символы '-', '|', '/', '\'.
+ *  Пользователь должен иметь возможность ввести длину стороны и выбрать тип фигуры.
+ *  Программа должна нарисовать в консоли выбранную пользователем фигуру,
+ *  используя символы '-', '|', '/', '\'.
  * <p>
  * Обратите внимание, символ '\' в Java необходимо экранировать: '\\'.
  */
+
 public class Main {
-    public static void main(String[] args) {
+
+        public static void main(String[] args) {
+            Scanner in = new Scanner(System.in);
+            System.out.print("Введите тип фигуры: ");
+            String figureType = in.nextLine();
+            System.out.print("Введите длину стороны: ");
+            int length = in.nextInt();
+
+            if (length < 1) {
+                System.out.println("Некорректный ввод");
+                return;
+            }
+
+            RegularFigure figure = getFigure(figureType, length);
+
+            System.out.println(figure.getFigure());
+        }
+
+        private static RegularFigure getFigure(String figureType, int length) {
+            return switch (figureType.toLowerCase()) {
+                case Triangle.NAME -> new Triangle(length);
+                case Square.NAME -> new Square(length);
+                default -> new RegularFigure(length);
+            };
+        }
     }
-}

src/com/walking/lesson14_polymorphism/task1/figure/RegularFigure.java

@@ -0,0 +1,18 @@
+package com.walking.lesson14_polymorphism.task1.figure;
+
+public class RegularFigure {
+    private final int length;
+
+    public RegularFigure(int length) {
+        this.length = length;
+    }
+
+    public String getFigure() {
+        return "Неизвестная фигура";
+    }
+
+
+    public int getLength() {
+        return length;
+    }
+}

src/com/walking/lesson14_polymorphism/task1/figure/Square.java

@@ -0,0 +1,30 @@
+package com.walking.lesson14_polymorphism.task1.figure;
+
+public class Square extends RegularFigure {
+    public static final String NAME = "квадрат";
+
+    private final String HORIZONTAL = "-";
+    private final String VERTICAL = "|";
+    private final String SPACE = " ";
+
+    public Square(int length) {
+        super(length);
+    }
+
+    @Override
+    public String getFigure() {
+        String square = getHorizontalSide();
+        for (int i = 0; i < getLength() - 2; i++) {
+            square += getVerticalSide();
+        }
+        return square + getHorizontalSide();
+    }
+
+    private String getHorizontalSide() {
+        return SPACE + HORIZONTAL.repeat(getLength() - 2) + SPACE + "\n";
+    }
+
+    private String getVerticalSide() {
+        return VERTICAL + SPACE.repeat(getLength() - 2) + VERTICAL + "\n";
+    }
+}

src/com/walking/lesson14_polymorphism/task1/figure/Triangle.java

@@ -0,0 +1,38 @@
+package com.walking.lesson14_polymorphism.task1.figure;
+
+public class Triangle extends RegularFigure {
+    public static final String NAME = "треугольник";
+
+    private final String RIGHT_SIDE = "\\";
+    private final String LEFT_SIDE = "/";
+    private final String BOTTOM_SIDE = "_";
+    private final String SPACE = " ";
+
+    public Triangle(int length) {
+        super(length);
+    }
+
+    @Override
+    public String getFigure() {
+        return getTriangle() + getBottomSide();
+    }
+
+    private String getBottomSide() {
+        return LEFT_SIDE + BOTTOM_SIDE.repeat(getLength()) + RIGHT_SIDE;
+    }
+
+    private String getTriangle() {
+        int k = getLength() / 2;
+        int j = getLength() % 2;
+
+        String triangle = "";
+        for (int i = 0; i < getLength() / 2; i++) {
+            triangle += SPACE.repeat(k) + LEFT_SIDE + SPACE.repeat(j) + RIGHT_SIDE + "\n";
+            k--;
+            j += 2;
+        }
+
+        return triangle;
+    }
+
+}

src/com/walking/lesson16_abstract_class_interface/task1_abstract_class/Main.java

@@ -1,11 +1,37 @@
 package com.walking.lesson16_abstract_class_interface.task1_abstract_class;
 
+
+import com.walking.lesson16_abstract_class_interface.task1_abstract_class.figures.RegularFigure;
+import com.walking.lesson16_abstract_class_interface.task1_abstract_class.figures.Square;
+import com.walking.lesson16_abstract_class_interface.task1_abstract_class.figures.Triangle;
+import com.walking.lesson16_abstract_class_interface.task1_abstract_class.figures.Unknown;
+
+import java.util.Scanner;
+
 /**
  * Реализуйте задачу
  * <a href="https://github.com/KFalcon2022/practical-tasks/tree/master/src/com/walking/lesson14_polymorphism/task1">...</a>
  * используя абстрактный класс.
  */
 public class Main {
     public static void main(String[] args) {
+        Scanner in = new Scanner(System.in);
+        System.out.print("Введите тип фигуры: ");
+        String figureType = in.nextLine();
+        System.out.print("Введите длину стороны: ");
+        int length = in.nextInt();
+
+        if (length < 1) {
+            System.out.println("Некорректный ввод");
+            return;
+        }
+
+        RegularFigure figure = switch (figureType.toLowerCase()) {
+            case Triangle.NAME -> new Triangle(length);
+            case Square.NAME -> new Square(length);
+            default -> new Unknown(length);
+        };
+
+        System.out.println(figure.getFigure());
     }
 }

src/com/walking/lesson16_abstract_class_interface/task1_abstract_class/figures/RegularFigure.java

@@ -0,0 +1,17 @@
+package com.walking.lesson16_abstract_class_interface.task1_abstract_class.figures;
+
+public abstract class RegularFigure {
+    protected final String SPACE = " ";
+    protected final String NEXT_LINE_SYMBOL = "\n";
+    private final int length;
+
+    protected RegularFigure(int length) {
+        this.length = length;
+    }
+
+    public abstract String getFigure();
+
+    public int getLength() {
+        return length;
+    }
+}

src/com/walking/lesson16_abstract_class_interface/task1_abstract_class/figures/Square.java

@@ -0,0 +1,29 @@
+package com.walking.lesson16_abstract_class_interface.task1_abstract_class.figures;
+
+public class Square extends RegularFigure {
+    public static final String NAME = "квадрат";
+
+    private final String HORIZONTAL = "-";
+    private final String VERTICAL = "|";
+
+    public Square(int length) {
+        super(length);
+    }
+
+    @Override
+    public String getFigure() {
+        String square = getHorizontalSide();
+        for (int i = 0; i < getLength() - 2; i++) {
+            square += getVerticalSide();
+        }
+        return square + getHorizontalSide();
+    }
+
+    private String getHorizontalSide() {
+        return SPACE + HORIZONTAL.repeat(getLength() - 2) + SPACE + NEXT_LINE_SYMBOL;
+    }
+
+    private String getVerticalSide() {
+        return VERTICAL + SPACE.repeat(getLength() - 2) + VERTICAL + NEXT_LINE_SYMBOL;
+    }
+}

src/com/walking/lesson16_abstract_class_interface/task1_abstract_class/figures/Triangle.java

@@ -0,0 +1,37 @@
+package com.walking.lesson16_abstract_class_interface.task1_abstract_class.figures;
+
+public class Triangle extends RegularFigure {
+    public static final String NAME = "треугольник";
+
+    private final String RIGHT_SIDE = "\\";
+    private final String LEFT_SIDE = "/";
+    private final String BOTTOM_SIDE = "_";
+
+
+    public Triangle(int length) {
+        super(length);
+    }
+
+    @Override
+    public String getFigure() {
+        return getTriangle() + getBottomSide();
+    }
+
+    private String getBottomSide() {
+        return LEFT_SIDE + BOTTOM_SIDE.repeat(getLength()) + RIGHT_SIDE;
+    }
+
+    private String getTriangle() {
+        int k = getLength() / 2;
+        int j = getLength() % 2;
+
+        String triangle = "";
+        for (int i = 0; i < getLength() / 2; i++) {
+            triangle += SPACE.repeat(k) + LEFT_SIDE + SPACE.repeat(j) + RIGHT_SIDE + NEXT_LINE_SYMBOL;
+            k--;
+            j += 2;
+        }
+
+        return triangle;
+    }
+}

src/com/walking/lesson16_abstract_class_interface/task1_abstract_class/figures/Unknown.java

@@ -0,0 +1,13 @@
+package com.walking.lesson16_abstract_class_interface.task1_abstract_class.figures;
+
+public class Unknown extends RegularFigure {
+
+    public Unknown(int length) {
+        super(length);
+    }
+
+    @Override
+    public String getFigure() {
+        return "Неизвестная фигура";
+    }
+}

src/com/walking/lesson16_abstract_class_interface/task1_interface/Main.java

@@ -1,12 +1,13 @@
 package com.walking.lesson16_abstract_class_interface.task1_interface;
 
-
 /**
  * Реализуйте задачу
  * <a href="https://github.com/KFalcon2022/practical-tasks/tree/master/src/com/walking/lesson14_polymorphism/task1">...</a>
  * используя интерфейс.
  */
 public class Main {
     public static void main(String[] args) {
+
     }
+
 }

src/com/walking/lesson16_abstract_class_interface/task2/Main.java

@@ -1,11 +1,29 @@
 package com.walking.lesson16_abstract_class_interface.task2;
 
+import com.walking.lesson16_abstract_class_interface.task2.greet.*;
+
+import java.util.Scanner;
+
 /**
  * Реализуйте задачу
  * <a href="https://github.com/KFalcon2022/practical-tasks/blob/master/src/com/walking/lesson3/Task2SwitchCase.java">...</a>
  * с использованием интерфейсов. Каждая реализация должна возвращать свое сообщение.
  */
 public class Main {
     public static void main(String[] args) {
+        Scanner in = new Scanner(System.in);
+        System.out.print("Enter message: ");
+        String message = in.nextLine();
+
+        System.out.println(getGreeting(message));
+    }
+
+    private static Greeting getGreeting(String message) {
+        return switch (message) {
+            case "Hi" -> new Hello();
+            case "Bye" -> new Goodbye();
+            case "How are you" -> new How();
+            default -> new Unknown();
+        };
     }
 }

src/com/walking/lesson16_abstract_class_interface/task2/greet/Goodbye.java

@@ -0,0 +1,10 @@
+package com.walking.lesson16_abstract_class_interface.task2.greet;
+
+public class Goodbye implements Greeting {
+    final static String RESPOND = "Goodbye";
+
+    @Override
+    public String greet() {
+        return RESPOND;
+    }
+}

src/com/walking/lesson16_abstract_class_interface/task2/greet/Greeting.java

@@ -0,0 +1,7 @@
+package com.walking.lesson16_abstract_class_interface.task2.greet;
+
+public interface Greeting {
+
+    String greet();
+
+}

src/com/walking/lesson16_abstract_class_interface/task2/greet/Hello.java

@@ -0,0 +1,10 @@
+package com.walking.lesson16_abstract_class_interface.task2.greet;
+
+public class Hello implements Greeting {
+    final static String RESPOND = "Hello";
+
+    @Override
+    public String greet() {
+       return RESPOND;
+    }
+}

src/com/walking/lesson16_abstract_class_interface/task2/greet/How.java

@@ -0,0 +1,11 @@
+package com.walking.lesson16_abstract_class_interface.task2.greet;
+
+public class How implements Greeting {
+    final static String RESPOND = "How are you doing";
+
+    @Override
+    public String greet() {
+        return RESPOND;
+    }
+
+}

src/com/walking/lesson16_abstract_class_interface/task2/greet/Unknown.java

@@ -0,0 +1,8 @@
+package com.walking.lesson16_abstract_class_interface.task2.greet;
+
+public class Unknown implements Greeting {
+    @Override
+    public String greet() {
+        return "Unknown message";
+    }
+}

src/com/walking/lesson16_abstract_class_interface/task3/Main.java

@@ -1,6 +1,11 @@
 package com.walking.lesson16_abstract_class_interface.task3;
 
 
+import com.walking.lesson16_abstract_class_interface.task3.animals.Animal;
+import com.walking.lesson16_abstract_class_interface.task3.animals.Cat;
+import com.walking.lesson16_abstract_class_interface.task3.animals.Cow;
+import com.walking.lesson16_abstract_class_interface.task3.animals.Dog;
+
 /**
  * Реализуйте любую задачу из уроков о наследовании или полиморфизме с использованием новых знаний.
  * Выбирайте инструмент с умом.
@@ -10,5 +15,10 @@
  */
 public class Main {
     public static void main(String[] args) {
+        Animal[] animals = new Animal[] {new Cow(), new Dog(), new Cat()};
+
+        for (Animal animal : animals) {
+            animal.sound();
+        }
     }
 }