Create Lab6

Lab5

@@ -0,0 +1,184 @@
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+
+class Letter {
+    private char value;
+
+    public Letter(char value) {
+        this.value = value;
+    }
+
+    public char getValue() {
+        return value;
+    }
+}
+
+class Word {
+    private List<Letter> letters = new ArrayList<>();
+
+    public Word(String input) {
+        for (char c : input.toCharArray()) {
+            letters.add(new Letter(c));
+        }
+    }
+
+    public List<Letter> getLetters() {
+        return letters;
+    }
+
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        for (Letter letter : letters) {
+            sb.append(letter.getValue());
+        }
+        return sb.toString();
+    }
+}
+
+class PunctuationMark {
+    private char value;
+
+    public PunctuationMark(char value) {
+        this.value = value;
+    }
+
+    public char getValue() {
+        return value;
+    }
+}
+
+class Sentence {
+    private List<Object> elements = new ArrayList<>();
+
+    public Sentence(String input) {
+        StringBuilder sb = new StringBuilder();
+        for (char c : input.toCharArray()) {
+            if (Character.isLetterOrDigit(c)) {
+                sb.append(c);
+            } else {
+                if (sb.length() > 0) {
+                    elements.add(new Word(sb.toString()));
+                    sb.setLength(0);
+                }
+                elements.add(new PunctuationMark(c));
+            }
+        }
+        if (sb.length() > 0) {
+            elements.add(new Word(sb.toString()));
+        }
+    }
+
+    public List<Object> getElements() {
+        return elements;
+    }
+
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        for (Object element : elements) {
+            if (element instanceof Word) {
+                sb.append(((Word) element).toString());
+            } else {
+                sb.append(((PunctuationMark) element).getValue());
+            }
+        }
+        return sb.toString();
+    }
+}
+
+class Text {
+    private List<Sentence> sentences = new ArrayList<>();
+
+    public Text(String input) {
+        StringBuilder sb = new StringBuilder();
+        for (char c : input.toCharArray()) {
+            if (c == '.' || c == '?' || c == '!' || c == ',') {
+                sb.append(c);
+                sentences.add(new Sentence(sb.toString()));
+                sb.setLength(0);
+            } else {
+                sb.append(c);
+            }
+        }
+        if (sb.length() > 0) {
+            sentences.add(new Sentence(sb.toString()));
+        }
+    }
+
+    public List<Sentence> getSentences() {
+        return sentences;
+    }
+
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        for (Sentence sentence : sentences) {
+            sb.append(sentence.toString());
+        }
+        return sb.toString();
+    }
+}
+
+public class Lab5 {
+    public static void main(String[] args) {
+        int C17 = 2430 % 17;
+        System.out.println("\n---------------------------------------------------------------------------------------------------------------------");
+        System.out.println("  C17 = " + C17 + ", So, the task is:  delete all previous occurrences of the last letter of each word of the specified text.");
+        System.out.println("---------------------------------------------------------------------------------------------------------------------");
+
+        Scanner scanner = new Scanner(System.in);
+        boolean isDone = false;
+        while (!isDone) {
+            System.out.print("\nEnter a string or type 'q' to quit: ");
+            String input = scanner.nextLine().trim();
+            if (input.equals("q")) {
+                System.out.print("\n The work is completed.");
+                isDone = true;
+            } else if (input.isEmpty()) {
+                System.out.println("Error: Input string is empty. Please enter a non-empty string.");
+            } else {
+                try {
+                    StringBuilder sb = new StringBuilder(input);
+                    String[] words = sb.toString().split("\\s+");
+                    for (int i = 0; i < words.length; i++) {
+                        String word = words[i];
+                        char lastChar = word.charAt(word.length() - 1);
+                        if (!Character.isLetterOrDigit(lastChar)) {
+                            int lastLetterIndex = -1;
+                            for (int j = word.length() - 2; j >= 0; j--) {
+                                if (Character.isLetter(word.charAt(j))) {
+                                    lastLetterIndex = j;
+                                    break;
+                                }
+                            }
+                            if (lastLetterIndex != -1) {
+                                char lastLetter = word.charAt(lastLetterIndex);
+                                String newWord = "";
+                                for (int j = 0; j < word.length() - 1; j++) {
+                                    if (!Character.isLetterOrDigit(word.charAt(j)) || word.charAt(j) != lastLetter) {
+                                        newWord += word.charAt(j);
+                                    }
+                                }
+                                newWord += lastChar;
+                                words[i] = newWord;
+                            }
+                        } else {
+                            char lastLetter = lastChar;
+                            String newWord = "";
+                            for (int j = 0; j < word.length() - 1; j++) {
+                                if (!Character.isLetterOrDigit(word.charAt(j)) || word.charAt(j) != lastLetter) {
+                                    newWord += word.charAt(j);
+                                }
+                            }
+                            newWord += lastLetter;
+                            words[i] = newWord;
+                        }
+                    }
+                    System.out.print("\n Final string: ");
+                    System.out.println(String.join(" ", words));
+                } catch (Exception e) {
+                    System.out.println("An error occurred: " + e.getMessage());
+                }
+            }
+        }
+    }
+}

Lab6

@@ -0,0 +1,225 @@
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+import java.util.Comparator;
+
+class ToyRoom {
+
+    public static void variant() {
+        int C13 = 2430 % 13;
+        System.out.println("\n            ---------------------------------------------------------------------------------------------------------------------");
+        System.out.println("                          C13 = " + C13 + ", So, the task is:  Prepare the toy room for children of different age groups.");
+        System.out.println("            ---------------------------------------------------------------------------------------------------------------------");
+    }
+
+    private List<Toy> toys;
+
+    public ToyRoom() {
+        this.toys = new ArrayList<>();
+    }
+
+    public void addToy(Toy toy) {
+        toys.add(toy);
+    }
+
+    public void displayToys() {
+        System.out.println(" -------------------------------------------------------");
+        System.out.printf(" | %-20s | %-10s | %-15s |\n", "Name", "Price ($)", "Age Group");
+        System.out.println(" |----------------------|------------|-----------------|");
+        for (Toy toy : toys) {
+            System.out.printf(" | %-20s | %-10.2f | %-15s |\n", toy.name, toy.price, toy.ageGroup);
+        }
+        System.out.println(" -------------------------------------------------------");
+    }
+
+    public void sortToys(boolean ascending) {
+        if (ascending) {
+            toys.sort(Comparator.comparingDouble(Toy::getPrice));
+        } else {
+            toys.sort(Comparator.comparingDouble(Toy::getPrice).reversed());
+        }
+    }
+
+    public List<Toy> findToysByPriceRange(double minPrice, double maxPrice) {
+        List<Toy> foundToys = new ArrayList<>();
+        for (Toy toy : toys) {
+            if (toy.getPrice() >= minPrice && toy.getPrice() <= maxPrice) {
+                foundToys.add(toy);
+            }
+        }
+        return foundToys;
+    }
+
+    public void findToysByName(String name) {
+        List<Toy> foundToys = new ArrayList<>();
+        for (Toy toy : toys) {
+            if (toy.name.toLowerCase().contains(name.toLowerCase())) {
+                foundToys.add(toy);
+            }
+        }
+
+        if (!foundToys.isEmpty()) {
+            System.out.println("\n Toys with matching name \"" + name + "\":");
+            System.out.println(" -------------------------------------------------------");
+            System.out.printf(" | %-20s | %-10s | %-15s |\n", "Name", "Price ($)", "Age Group");
+            System.out.println(" |----------------------|------------|-----------------|");
+            for (Toy toy : foundToys) {
+                System.out.printf(" | %-20s | %-10.2f | %-15s |\n", toy.name, toy.price, toy.ageGroup);
+            }
+            System.out.println(" -------------------------------------------------------");
+        } else {
+            System.out.println(" No toys found with a matching name.");
+        }
+    }
+}
+
+
+abstract class Toy {
+    protected String name;
+    protected double price;
+    protected String ageGroup;
+
+    public Toy(String name, double price, String ageGroup) {
+        this.name = name;
+        this.price = price;
+        this.ageGroup = ageGroup;
+
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+    @Override
+    public String toString() {
+        return name + " - $" + price + ageGroup;
+    }
+}
+
+class Car extends Toy {
+    public Car(String name, double price, String ageGroup) {
+        super(name, price, ageGroup);
+    }
+}
+
+class Doll extends Toy {
+    public Doll(String name, double price, String ageGroup) {
+        super(name, price, ageGroup);
+    }
+}
+
+class Ball extends Toy {
+    public Ball(String name, double price, String ageGroup) {
+        super(name, price, ageGroup);
+    }
+}
+
+class Cube extends Toy {
+    public Cube(String name, double price, String ageGroup) {
+        super(name, price, ageGroup);
+    }
+}
+
+public class Lab6 {
+    public static void main(String[] args) {
+        ToyRoom toyRoom = new ToyRoom();
+        ToyRoom.variant();
+
+        toyRoom.addToy(new Car("Small car 'Mcqueen'", 10.0, "1-3 years"));
+        toyRoom.addToy(new Car("Small Car 'Audi'", 12.0, "1-3 years"));
+        toyRoom.addToy(new Car("Medium Yellow Car", 15.0, "3-6 years"));
+        toyRoom.addToy(new Car("Medium Blue Car", 18.0, "3-6 years"));
+        toyRoom.addToy(new Car("Car on R/C", 30.0, "6-10 years"));
+        toyRoom.addToy(new Doll("Doll that can talk", 25.0, "1-3 years"));
+        toyRoom.addToy(new Doll("Doll 'Barbie'", 10.0, "3-6 years"));
+        toyRoom.addToy(new Doll("Bear Teddy", 14.5, "6-12 months"));
+        toyRoom.addToy(new Ball("Yellow Ball", 5.0, "6-12 months"));
+        toyRoom.addToy(new Ball("Big Blue Ball", 7.0, "1-3 years"));
+        toyRoom.addToy(new Ball("Football Ball", 12.5, "6-10 years"));
+        toyRoom.addToy(new Cube("Cubes with pictures", 6.5, "6-12 months"));
+        toyRoom.addToy(new Cube("Cubes with letters", 9.0, "3-6 years"));
+        toyRoom.addToy(new Cube("Rubik's Cube", 14.0, "6-10 years"));
+
+        boolean exit = false;
+        Scanner scanner = new Scanner(System.in);
+
+        while (!exit) {
+            System.out.println("\n Select an option:");
+            System.out.println("  1 - Display all toys;");
+            System.out.println("  2 - Find toy by price range;");
+            System.out.println("  3 - Sort toys by price;");
+            System.out.println("  4 - Find a toy by name;");
+            System.out.println("  Q - Quit;\n");
+
+            String option = scanner.nextLine();
+
+            switch (option.toLowerCase()) {
+                case "1":
+                    System.out.println(" Toys in the Toy Room:");
+                    toyRoom.displayToys();
+                    break;
+                case "2":
+                    System.out.print(" Enter the minimum price for the toy: ");
+                    double minPrice = scanner.nextDouble();
+                    scanner.nextLine();
+
+                    System.out.print(" Enter the maximum price for the toy: ");
+                    double maxPrice;
+                    do {
+                        maxPrice = scanner.nextDouble();
+                        scanner.nextLine();
+
+                        if (minPrice >= maxPrice) {
+                            System.out.println(" Error: The minimum price must be less than the maximum price. Please try again.");
+                            System.out.print(" Enter the maximum price for the toy: ");
+                        }
+                    } while (minPrice >= maxPrice);
+
+                    List<Toy> foundToys = toyRoom.findToysByPriceRange(minPrice, maxPrice);
+                    if (!foundToys.isEmpty()) {
+                        System.out.println("\n Found toys within the price range:");
+                        System.out.println(" -------------------------------------------------------");
+                        System.out.printf(" | %-20s | %-10s | %-15s |\n", "Name", "Price ($)", "Age Group");
+                        System.out.println(" |----------------------|------------|-----------------|");
+                        for (Toy toy : foundToys) {
+                            System.out.printf(" | %-20s | %-10.2f | %-15s |\n", toy.name, toy.price, toy.ageGroup);
+                        }
+                        System.out.println(" -------------------------------------------------------");
+                    } else {
+                        System.out.println("\n No toys found within the price range.");
+                    }
+                    break;
+
+                case "3":
+                    System.out.println(" Choose the sorting order:");
+                    System.out.println("  A - Ascending");
+                    System.out.println("  D - Descending");
+                    String sortOrder = scanner.nextLine();
+
+                    boolean ascending = true;
+                    if (sortOrder.equalsIgnoreCase("D")) {
+                        ascending = false;
+                    }
+
+                    toyRoom.sortToys(ascending);
+                    System.out.println("\n Toys in the Toy Room after sorting:");
+                    toyRoom.displayToys();
+                    break;
+
+                case "4":
+                    System.out.print(" Enter the toy name: ");
+                    String toyName = scanner.nextLine();
+
+                    toyRoom.findToysByName(toyName);
+                    break;
+
+                case "q":
+                    exit = true;
+                    System.out.println(" Program exited. Thank you!");
+                    break;
+                default:
+                    System.out.println(" Invalid option. Please try again.");
+            }
+        }
+    }
+}

lab3

@@ -1,6 +1,6 @@
 import java.util.Scanner;
 
-public class lab3 {
+public class Lab5 {
     public static void main(String[] args) {
 
         int C17 = 2430 % 17;
@@ -19,15 +19,39 @@ public class lab3 {
             String[] words = sb.toString().split("\\s+");
             for (int i = 0; i < words.length; i++) {
                 String word = words[i];
-                char lastLetter = word.charAt(word.length() - 1);
-                String newWord = "";
-                for (int j = 0; j < word.length() - 1; j++) {
-                    if (word.charAt(j) != lastLetter) {
-                        newWord += word.charAt(j);
+                char lastChar = word.charAt(word.length() - 1);
+                if (!Character.isLetterOrDigit(lastChar)) {
+                    // Last character is a punctuation mark
+                    int lastLetterIndex = -1;
+                    for (int j = word.length() - 2; j >= 0; j--) {
+                        if (Character.isLetter(word.charAt(j))) {
+                            lastLetterIndex = j;
+                            break;
+                        }
                     }
+                    if (lastLetterIndex != -1) {
+                        char lastLetter = word.charAt(lastLetterIndex);
+                        String newWord = "";
+                        for (int j = 0; j < word.length() - 1; j++) {
+                            if (!Character.isLetterOrDigit(word.charAt(j)) || word.charAt(j) != lastLetter) {
+                                newWord += word.charAt(j);
+                            }
+                        }
+                        newWord += lastChar;
+                        words[i] = newWord;
+                    }
+                } else {
+                    // Last character is a letter or a digit
+                    char lastLetter = lastChar;
+                    String newWord = "";
+                    for (int j = 0; j < word.length() - 1; j++) {
+                        if (!Character.isLetterOrDigit(word.charAt(j)) || word.charAt(j) != lastLetter) {
+                            newWord += word.charAt(j);
+                        }
+                    }
+                    newWord += lastLetter;
+                    words[i] = newWord;
                 }
-                newWord += lastLetter;
-                words[i] = newWord;
             }
             System.out.print("\nFinal string: ");
             System.out.println(String.join(" ", words));
@@ -36,3 +60,4 @@ public class lab3 {
         }
     }
 }
+