Create SixthLab.java

.idea/misc.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_19" default="true" project-jdk-name="openjdk-18" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_18" default="true" project-jdk-name="openjdk-18" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>

src/Lab1/Lab1.java

@@ -1,140 +0,0 @@
-package Lab1;
-
-import java.util.InputMismatchException;
-import java.util.Scanner;
-
-public class Lab1 {
-    public static void main(String[] args) {
-        int C2, C3, C5, C7; // creating variables
-        int numBook = 2401; // default value of scorebook
-
-        Scanner sc = new Scanner(System.in); // scanner creating for inputing values from keyboard
-        System.out.println("By default number of scorebook is 2401. \nEnter to skip or input new value: ");
-        String input = sc.nextLine();
-
-        if (!input.equals("")) { // try-catch for checking correct inputing of value
-            try {
-                numBook = Math.abs(Integer.parseInt(input)); // scorebook can be only unsigned
-            } catch (NumberFormatException e) {
-                System.out.println("Invalid input. Using default value 2401"); // printing that will be used default value
-            }
-        }
-
-        String[] operations1 = {"+", "-"};//
-        String[] operations2 = {"*", "/", "%", "+", "-"}; //  String array for choosing operations
-        String[] operations3 = {"byte", "short", "int", "long", "char", "float", "double"}; //
-        // determining variables
-        C2 = numBook % 2;
-        C3 = numBook % 3;
-        C5 = numBook % 5;
-        C7 = numBook % 7;
-
-        String O1 = operations1[C2];
-        int C = C3;
-        String O2 = operations2[C5];
-        String O3 = operations3[C7];
-
-        System.out.println("C2 is: " + C2 + ", operation is: " + O1); //
-        System.out.println("C3 is: " + C);                            // printing parameters that user got
-        System.out.println("C5 is: " + C5 + ", operation is: " + O2); //
-        System.out.println("C7 is: " + C7 + ", Type of indexes i and j is: " + O3); //
-
-        Number i = 0; // creating objects i j of (abstract)superclass Number
-        Number j = 0; //
-
-
-        System.out.println("\nEnter a value for i and j in the " + O3 + " type: ");
-
-        switch (O3) { // Choosing type of i and j by C7
-            case "byte" -> {
-                try {
-                    i = sc.nextByte();
-                    j = sc.nextByte();
-                } catch (InputMismatchException e) {
-                    System.out.println("Invalid input. Please enter a valid byte value.");
-                    sc.nextLine();
-                }
-            }
-            case "short" -> {
-                i = sc.nextShort();
-                j = sc.nextShort();
-            }
-            case "int" -> {
-                i = sc.nextInt();
-                j = sc.nextInt();
-            }
-            case "long" -> {
-                i = sc.nextLong();
-                j = sc.nextLong();
-            }
-            case "char" -> {
-                System.out.println("Read only first character!");
-                i = (int) sc.next().charAt(0);
-                j = (int) sc.next().charAt(0);
-            }
-            case "float" -> {
-                i = sc.nextFloat();
-                j = sc.nextFloat();
-            }
-            case "double" -> {
-                i = sc.nextDouble();
-                j = sc.nextDouble();
-            }
-
-        }
-
-
-        System.out.println("The value of the created variables is: " + i + " and " + j);
-
-
-
-        class Sum { // creating class Sum
-            int n, m;
-            double i, j;
-
-            public Sum(double i, double j, int n, int m) { // Constructor to initialize all variables
-                this.i = i;
-                this.j = j;
-                this.n = n;
-                this.m = m;
-            }
-
-            public void calc() { // create method for our class
-                double sum = 0, result = 0, result2 = 0;
-                if ((O1.equals("-") && i + n >= C && i <= C) || (C == 0 && i == 0)) { // exclude situations
-                    System.out.println("dividing by zero!");                          // with dividing by 0
-                } else if (i > n || j > m) {
-                    System.out.println("i or j greater than n or m");
-                } else {
-                    for (double b = i; b <= n; b++) {
-                        for (double a = j; a <= m; a++) {
-                            switch (O2) {
-                                case "+" -> result = b + a;
-                                case "-" -> result = b - a;
-                                case "*" -> result = b * a;
-                                case "/" -> result = b / a;
-                                case "%" -> result = b % a;
-                            }
-                            switch (O1) {
-                                case "+" -> result2 = b + C;
-                                case "-" -> result2 = b - C;
-                            }
-                            sum += result / result2;
-                        }
-                    }
-                    System.out.println("Sum is: " + sum);
-                }
-            }
-        }
-
-        System.out.print("Enter value for n and m: \n");
-
-        int n = sc.nextInt();
-        int m = sc.nextInt();
-
-        Sum sum = new Sum(i.doubleValue(), j.doubleValue(), n, m); // creating new instance of Sum class
-        // .doubleValue() converting our variables to double
-        sum.calc();
-        sc.close();
-    }
-}

src/Lab2/Lab2.java

@@ -1,153 +0,0 @@
-package Lab2;
-
-import java.util.Scanner;
-import java.util.Random;
-
-public class Lab2 {
-    public static void main(String[] args) {
-        final int C5, C7, C11, NumBook;
-        NumBook = 2401;
-        C5 = NumBook % 5;
-        C7 = NumBook % 7;
-        C11 = NumBook % 11;
-        System.out.println("-----------------------------------------------------");
-        System.out.println("C5 is: " + C5 + " - act with martix is C=Bт");
-        System.out.println("C7 is: " + C7 + " - type of elements is double");
-        System.out.println("C11 is: " + C11 + " - calculate the sum of the largest elements\n" +
-                "of each row of the matrix");
-        System.out.println("-----------------------------------------------------");
-        int Mside = 0;
-        int Nside = 0;
-        int Choose;
-        double MaxSum = 0;
-        Random rand = new Random();
-        Scanner sc = new Scanner(System.in);
-
-        while (true) {
-            try {
-                System.out.print("Enter random or handle input(1 or 0): ");
-                Choose = Math.abs(Integer.parseInt(sc.nextLine()));
-                if (Choose == 1 || Choose == 0) {
-                    break;
-                }
-            } catch (NumberFormatException e) {
-                System.out.println("Invalid input. Please enter an integer.");
-            }
-
-        }
-        while (true) {
-            try {
-                System.out.print("Enter number of rows: ");
-                Mside = Math.abs(Integer.parseInt(sc.nextLine()));
-                if (Mside <= 0) {
-                    System.out.println("Invalid input. Number of rows must be greater than 0");
-
-                } else {
-                    break;
-                }
-            } catch (NumberFormatException e) {
-                System.out.println("Invalid input. Please enter an integer.");
-            }
-        }
-
-        while (true) {
-            try {
-                System.out.print("Enter number of columns: ");
-                Nside = Math.abs(Integer.parseInt(sc.nextLine()));
-                if (Nside <= 0) {
-                    System.out.println("Invalid input. Number of columns must be greater than 0");
-
-                } else {
-                    break;
-                }
-            } catch (NumberFormatException e) {
-                System.out.println("Invalid input. Please enter an integer.");
-            }
-        }
-        final int lenghtMaxElements = 5;
-        double[][] CArray = new double[Mside][Nside];
-        double[][] TransposedArray = new double[Nside][Mside];
-        double[][] MaxElements = new double[Nside][lenghtMaxElements];
-        if (Choose == 1) {
-            for (int i = 0; i < Mside; i++) {
-                for (int j = 0; j < Nside; j++) {
-                    CArray[i][j] = rand.nextDouble(-100, 100);
-                }
-
-            }
-        }
-        if (Choose == 0) {
-            for (int i = 0; i < Mside; i++) {
-                for (int j = 0; j < Nside; j++) {
-                    while (true) {
-                        try {
-                            System.out.printf("Enter the element at position (%d,%d): ", i + 1, j + 1);
-                            CArray[i][j] = Double.parseDouble(sc.nextLine());
-                            break;
-                        } catch (NumberFormatException e) {
-                            System.out.println("Invalid input. Please enter a valid number.");
-                        }
-                    }
-                }
-            }
-        }
-        for (int i = 0; i < Mside; i++) {
-            for (int j = 0; j < Nside; j++) {
-                System.out.printf("%8.2f", CArray[i][j]);
-            }
-            System.out.println();
-        }
-
-        for (int i = 0; i < Nside; i++) {
-            for (int j = 0; j < Mside; j++) {
-                TransposedArray[i][j] = CArray[j][i];
-            }
-        }
-        System.out.println("Transposed array is:");
-        int row, cols;
-        for (row = 0; row < Nside; row++) {
-            for (cols = 0; cols < Mside; cols++) {
-                System.out.printf("%8.2f", TransposedArray[row][cols]);
-
-            }
-            System.out.println();
-        }
-
-        for (int i = 0; i < Nside; i++) {
-            MaxElements[i][0] = TransposedArray[i][0];
-
-            for (int j = 1; j < Mside; j++) {
-                MaxElements[i][1] = i;
-                if (TransposedArray[i][j] > MaxElements[i][0]) {
-                    MaxElements[i][0] = TransposedArray[i][j];
-                    MaxElements[i][2] = j;
-
-
-                } else if (TransposedArray[i][j] == MaxElements[i][0]) {
-                    MaxElements[i][3] = MaxElements[i][0];
-                    MaxElements[i][4] = 1;
-
-                }
-
-
-            }
-            //System.out.println(MaxElements[i][0] +" "+ MaxElements[i][1] +" "+ MaxElements[i][2] + " " + MaxElements[i][3] + " " + MaxElements[i][4]);
-            //code i used for debug
-        }
-        System.out.println("Max elements for each row:");
-        if (Mside == 1) {
-            System.out.println("I can`t find max element for mx1 matrix");
-
-        } else {
-            for (int i = 0; i < Nside; i++) {
-                if (MaxElements[i][0] == MaxElements[i][3] && MaxElements[i][4] == 1) {
-                    System.out.printf("In row %1.0f does not exist a max element\n", MaxElements[i][1] + 1);
-                } else {
-                    System.out.printf("%8.2f is max value and his coordinate: (%1.0f, %1.0f)\n", MaxElements[i][0], MaxElements[i][1] + 1, MaxElements[i][2] + 1);
-                    MaxSum += MaxElements[i][0];
-                }
-            }
-            System.out.printf("Sum of elements with max values is: %.2f\n", MaxSum);
-        }
-    }
-}

src/Main.java

@@ -0,0 +1,15 @@
+public class Main {
+    public static void main(String[] args) {
+        System.out.println(args[2]);
+        System.out.println("Hello world!");
+//        System.out.println(1);
+    }
+
+    void myFunction() {
+
+    }
+
+    int myFunction2() {
+        return 1;
+    }
+}

src/_12_Закревський_Данило_Сергійович/lab1/FirstLab.java

@@ -0,0 +1,30 @@
+import java.util.Scanner;
+
+public class FirstLab {
+ 
+    public static void main(String[] args) {
+        Scanner scn = new Scanner(System.in);
+        final int C = 0; 
+        double S = 0.0;
+        System.out.print("Enter a: "); 
+        int a = scn.nextInt(); 
+        System.out.print("Enter b: ");
+        int b = scn.nextInt();
+        System.out.print("Enter n: ");
+        int n = scn.nextInt();
+        System.out.print("Enter m: ");
+        int m = scn.nextInt();
+        if ((a <= 0 & n >= 0) | (b <= 0 & m >= 0)){
+            System.out.println("Division by 0!"); 
+        } else {
+            for (char i = (char) a; i <= n; i++) {
+                for(char j = (char) b; j <= m; j++) {
+                        S += (double) (i % j) / (i + C);
+                }
+            }
+            System.out.printf("Result - %.3f", S);
+        }
+
+        scn.close();
+    }
+}

src/_12_Закревський_Данило_Сергійович/lab2/SecondLab.java

@@ -0,0 +1,63 @@
+import java.util.Scanner;
+import java.util.Random;
+
+public class SecondLab {
+
+    public static void main(String[] args) {
+        Scanner scn = new Scanner(System.in);
+        Random rnd = new Random();
+        System.out.print("Enter number of rows in matrix A: ");
+        int mA = scn.nextInt(); 
+        System.out.print("Enter the number of columns in matrix A: ");
+        int nA = scn.nextInt(); 
+        System.out.print("Enter number of rows in matrix B: ");
+        int mB = scn.nextInt(); 
+        System.out.print("Enter the number of columns in matrix B: ");
+        int nB = scn.nextInt(); 
+        long largest, sum = 0L; 
+        if(mA != mB || nA != nB) {
+            System.out.println("Unable to add matrices!"); 
+        } else {
+            long[][] matrixA = new long[mA][nA];
+            long[][] matrixB = new long[mB][nB]; 
+            long[][] matrixC = new long[mA][nA];
+
+            System.out.println("Matrix A: ");
+            for(int i = 0; i < mA; i++) {
+                for(int j = 0; j < nA; j++) {
+                    matrixA[i][j] = rnd.nextLong(10, 50) + 10;
+                    System.out.printf("|%d", matrixA[i][j]);      
+                }
+                System.out.println("|");
+            }
+            System.out.println("Matrix B: ");
+            for(int i = 0; i < nA; i++) {
+                for(int j = 0; j < nB; j++) {
+                    matrixB[i][j] = rnd.nextLong(10, 50) + 10;
+                    System.out.printf("|%d", matrixB[i][j]); 
+                }
+                System.out.println("|");
+            }
+            System.out.println("Matrix C: ");
+            for(int i = 0; i < mA; i++) {
+                for(int j = 0; j < nA; j++) {
+                    matrixC[i][j] = matrixA[i][j] + matrixB[i][j];
+                    System.out.printf("|%d", matrixC[i][j]);    
+                }
+                System.out.println("|");
+            }
+            for(long[] row: matrixC) {
+                largest = row[0];
+                for(long elem : row) {
+                    if(elem > largest) {
+                        largest = elem;    
+                    }
+                }
+                sum += largest;        
+            }
+            System.out.printf("Sum = %d", sum); 
+        }
+        scn.close();
+    }
+    
+}

src/_12_Закревський_Данило_Сергійович/lab3/ThirdLab.java

@@ -0,0 +1,33 @@
+import java.util.Scanner;
+
+public class ThirdLab {
+
+    public static void main(String[] args) {
+        Scanner scn = new Scanner(System.in);
+        System.out.print("Enter a string: "); 
+        String text = scn.nextLine();  
+        StringBuilder textBuilder = new StringBuilder(text); 
+        System.out.print("Enter a string to replace the words: ");
+        String replace = scn.nextLine(); 
+        System.out.print("Enter the length of the words to replace: ");
+        int length = scn.nextInt(); 
+        String[] words = textBuilder.toString().split("\\s+"); 
+        textBuilder.setLength(0);  
+        for(String word : words) {
+            if(word.charAt(word.length()-1) == '.' && word.length() - 1 == length) {
+                textBuilder.append(replace + ". "); 
+            } else if (word.charAt(word.length() - 1) == '!' && word.length() - 1 == length) {
+                textBuilder.append(replace + "! ");
+            } else if (word.charAt(word.length() - 1) == '?' && word.length() - 1 == length) { 
+                textBuilder.append(replace + "? ");
+            } else if (word.length() == length) {          
+                textBuilder.append(replace + " "); 
+            } else {
+                textBuilder.append(word + " ");
+            }
+        }
+
+        System.out.printf("Result: %s", textBuilder);
+        scn.close();
+    }
+}

src/_12_Закревський_Данило_Сергійович/lab4/Airplane.java

@@ -0,0 +1,59 @@
+import java.util.Comparator;
+
+public class Airplane {
+  private String name;
+	private String type; 
+	private int weight; 
+  private int amountOfEngines;
+  private int year; 
+	private String color; 
+	private int capacity;
+  private int price; 
+	
+
+  public Airplane(String name, String type, int weight, int amountOfEngines, int year, String color, int capacity, int price) {
+		this.name = name;
+    this.type = type;
+		this.weight = weight;
+		this.amountOfEngines = amountOfEngines;
+    this.year = year;
+		this.color = color;
+		this.capacity = capacity;
+    this.price = price;
+	}
+
+  public int getPrice() {
+      return price;
+  }
+
+  public int getYear() {
+      return year;
+  }
+
+  @Override
+  public String toString() {
+      return "Plane : " +
+              "name = " + name +
+              ", type = " + type +
+              ", weight = " + weight + " tons" +
+              ", amount of engines = " + amountOfEngines +
+              ", year = " + year + 
+              ", color = " + color + 
+              ", capacity = " + capacity + 
+              ", price = " + price + " millions dollars.";
+  }
+}
+
+class SortByPrice implements Comparator<Airplane> {
+    
+    public int compare(Airplane a, Airplane b) {
+        return a.getPrice() - b.getPrice();
+    }
+} 
+
+class SortByYear implements Comparator<Airplane> {
+
+    public int compare(Airplane a, Airplane b) {
+        return a.getYear() - b.getYear();
+    }
+}

src/_12_Закревський_Данило_Сергійович/lab4/FourthLab.java

@@ -0,0 +1,32 @@
+import java.util.Arrays;
+
+public class FourthLab {
+
+    public static void main(String[] args) {
+        final Airplane plane1 = new Airplane("Boeing 747", "passenger", 180, 4, 1970, "Lightblue", 467, 70);
+        final Airplane plane2 = new Airplane("Airbus A380", "passenger", 575, 4, 2003, "Orange", 850, 389);
+        final Airplane plane3 = new Airplane("General Dynamics F-16", "military", 9, 1, 1974, "Grey", 1, 45);
+        final Airplane plane4 = new Airplane("Boeing C-17 Globemaster III", "cargo", 130, 4, 1995, "Grey", 102, 340);
+        final Airplane plane5 = new Airplane("An-225 Mriya", "cargo", 285, 6, 1990, "White", 20, 500);
+        Airplane[] planes = {plane1, plane2, plane3, plane4, plane5};
+
+        System.out.println("List of planes: ");
+        for(Airplane plane : planes) {
+            System.out.println(plane);
+        }
+        System.out.println();
+
+        Arrays.sort(planes, new SortByPrice());
+        System.out.println("Sorted by price: ");  
+        for(Airplane plane : planes) {
+            System.out.println(plane);
+        }
+        System.out.println();
+
+        Arrays.sort(planes, new SortByYear().reversed());
+        System.out.println("Sorted by year: ");
+        for(Airplane plane : planes) {
+            System.out.println(plane);
+        }
+    }
+}

src/_12_Закревський_Данило_Сергійович/lab5/FifthLab.java

@@ -0,0 +1,139 @@
+import java.util.Scanner;
+
+public class FifthLab {
+
+    public static void main(String[] args) {
+        Scanner scn = new Scanner(System.in);
+        System.out.println("Enter a string: ");
+        String text = scn.nextLine();
+        StringBuilder textBuilder = new StringBuilder(text);
+        StringBuilder result = new StringBuilder();
+
+        System.out.print("Enter a string to replace the words: ");
+        String replace = scn.nextLine();
+        System.out.print("Enter the length of the words to replace: ");
+        int length = scn.nextInt();
+        
+        System.out.println("\nText before changes: ");
+        System.out.println(textBuilder);
+
+
+        String[] mySentence = textBuilder.toString().split("(?<=[!.?])\\s?");
+        for(String s: mySentence) {
+            StringBuilder sb = new StringBuilder(s);
+            Sentence sentence = new Sentence(sb, length, replace);
+            result.append(sentence.wordsSplit());
+        }
+
+        System.out.println("\nText after changes: ");
+        System.out.println(result);
+        scn.close();
+    }  
+}
+
+class Sentence {
+    
+    private final StringBuilder sentence;
+    private final int length;
+    private final String replace;
+
+    public Sentence(StringBuilder sentence, int length, String replace) {
+        this.sentence = sentence;
+        this.length = length;
+        this.replace = replace;
+    }
+
+    public StringBuilder wordsSplit() {
+        StringBuilder ReturnSentence = new StringBuilder();
+        String text = sentence.toString();
+        String[] words = text.split(" ");
+        for(String s: words) {
+            StringBuilder sb = new StringBuilder(s);
+            Word word = new Word(sb, length, replace);
+            ReturnSentence.append(word.lettersSplit()).append(" ");
+        }
+
+        return ReturnSentence;
+    }
+}
+
+class Word {
+
+    private final StringBuilder word;
+    private final int length;
+    private final String replace;
+
+    public Word(StringBuilder word, int length, String replace) {
+        this.word = word;
+        this.length = length;
+        this.replace = replace;
+    }
+
+    public StringBuilder lettersSplit() {
+        StringBuilder ReturnWord = new StringBuilder();
+        String wordstr = word.toString();
+        int len = wordstr.length();
+        String[] letters = wordstr.split("");
+        String[] ReplaceLetters = replace.split("");
+        char last = wordstr.charAt(word.length() - 1);
+        if(last == '!' || last == '?' || last == '.') {
+            if(wordstr.charAt(word.length() - 2) == '.') {
+                len = wordstr.length() - 3;
+            } else {
+                len = wordstr.length() - 1;
+            }
+        }
+        if(len == length) {
+            for(String chr: ReplaceLetters) {
+                StringBuilder ltr = new StringBuilder(chr);
+                Letter letter = new Letter(ltr);
+                ReturnWord.append(letter.getLetter());
+            }
+            if(wordstr.length() - len == 1) {
+                ReturnWord.append(wordstr.charAt(wordstr.length() - 1));
+            } else if(wordstr.length() - len == 3) {
+                ReturnWord.append("...");
+            }
+        } else {
+            for(String chr: letters) {
+                StringBuilder ltr = new StringBuilder(chr);
+                if(chr.equals("!") || chr.equals("?") || chr.equals(".") || chr.equals(",") || chr.equals(":") || chr.equals(";")) {
+                    Punctuation punctuation = new Punctuation(ltr);
+                    ReturnWord.append(punctuation.getPunctuation());
+                } else {
+                    Letter letter = new Letter(ltr);
+                    ReturnWord.append(letter.getLetter());
+                }
+            }
+        }
+        
+        return ReturnWord;
+    }
+}
+
+class Letter {
+
+    private final StringBuilder letter;
+
+    public Letter(StringBuilder letter) {
+        this.letter = letter;
+    }
+
+    public StringBuilder getLetter() {
+        return letter;
+    }
+
+}
+
+class Punctuation {
+
+    private final StringBuilder punctuation;
+
+    public Punctuation(StringBuilder punctuation) {
+        this.punctuation = punctuation;
+    }
+
+    public StringBuilder getPunctuation() {
+        return punctuation;
+    }
+} 

src/_12_Закревський_Данило_Сергійович/lab6/SixthLab.java

@@ -0,0 +1,138 @@
+import java.util.Scanner;
+import java.util.Arrays;
+import java.util.Comparator;
+
+public class SixthLab {
+    
+    public static int sumOfPassangers(Train[] trains) {
+        int sum = 0;
+        for (Train train: trains) {
+            sum += train.getCapacity();
+        }
+        return sum;
+    }
+
+    public static float sumOfLuggage(Train[] trains) {
+        float sum = 0.0f;
+        for (Train train: trains) {
+            sum += train.getLuggage();
+        }
+        return sum;
+    }
+    
+    public static void main(String[] args) {
+        Scanner scn = new Scanner(System.in);
+        Intercity intercity = new Intercity(2, "intercity", 57, 2.0f);
+        SV sv = new SV(3, "sv", 20, 1.3f);
+        Compartment compartment = new Compartment(2, "compartment", 40, 2.5f);
+        Plackart plackart = new Plackart(1, "plackart", 52, 1.8f);
+        Train[] trainCars = {intercity, sv, compartment, plackart};
+
+        System.out.println("List of train cars: ");
+        for (Train car: trainCars) {
+            System.out.println(car);
+        }
+
+        Arrays.sort(trainCars, new sortByComfort());
+        System.out.println("\nSorted list by comfort level: ");
+        for (Train car: trainCars) {
+            System.out.println(car);
+        }
+
+        System.out.printf("\n\nThe total number of passengers on the train - %d.\n", sumOfPassangers(trainCars));
+        System.out.printf("The total amount of train baggage - %.1f tons.", sumOfLuggage(trainCars));
+
+        System.out.println("\n\nFinding the train car by number of passengers");
+        System.out.print("Enter the lower number: ");
+        int lower = scn.nextInt();
+        System.out.print("Enter the extreme number: ");
+        int extreme = scn.nextInt();
+        boolean flag = false;
+        for (Train car: trainCars) {
+            int amount = car.getCapacity();
+            if(amount >= lower && amount <= extreme) {
+                System.out.println(car);
+                flag = true;
+            }
+        }
+        if (!flag) {
+            System.out.println("There is no such train car");
+        }
+        scn.close();
+    }
+}
+
+class Train {
+    private int comfortLevel;
+    private String type;
+    private int capacity;
+    private float luggage;
+
+    public Train(int comfortLevel, String type, int capacity, float luggage) {
+        this.comfortLevel = comfortLevel;
+        this.type = type;
+        this.capacity = capacity;
+        this.luggage = luggage;
+    }
+
+    public int getComfortLevel() {
+        return comfortLevel;
+    }
+
+    public String getType() {
+        return type;
+    }
+    
+    public int getCapacity() {
+        return capacity;
+    }
+
+    public float getLuggage() {
+        return luggage;
+    }
+
+    @Override
+    public String toString() {
+        return "Train : " + 
+                " Type: " + type +
+                ". Comfort level: " + comfortLevel +
+                ". Capacity: " + capacity + 
+                ". Luggage: " + luggage + " tons.";
+    }
+}
+
+
+class Intercity extends Train {
+
+    public Intercity(int comfortLevel, String type, int capacity, float luggage) {
+        super(comfortLevel, type, capacity, luggage);
+    }
+}
+
+class SV extends Train {
+
+    public SV(int comfortLevel, String type, int capacity, float luggage) {
+        super(comfortLevel, type, capacity, luggage);
+    }
+}
+
+class Compartment extends Train {
+
+    public Compartment(int comfortLevel, String type, int capacity, float luggage) {
+        super(comfortLevel, type, capacity, luggage);
+    }
+}
+
+class Plackart extends Train {
+
+    public Plackart(int comfortLevel, String type, int capacity, float luggage) {
+        super(comfortLevel, type, capacity, luggage);
+    }
+}
+
+class sortByComfort implements Comparator<Train> {
+    
+    public int compare(Train a, Train b){
+        return a.getComfortLevel() - b.getComfortLevel();
+    }
+}

src/encapsulationInheritancePolymorphism/Encapsulation.java

@@ -0,0 +1,20 @@
+package encapsulationInheritancePolymorphism;
+
+public class Encapsulation {
+    /*private*/ int field;
+    private int field2;
+//    int a = 1;
+
+    public void myMethodForTheField () {
+        System.out.println(field);
+    }
+
+    public void myMethodForTheField2 () {
+        System.out.println(field);
+    }
+
+    public void myMethodForTheFieldAndTheField2 () {
+        System.out.println(field);
+    }
+}
+

src/encapsulationInheritancePolymorphism/EncapsulationInheritancePolymorphism.java

@@ -0,0 +1,10 @@
+package encapsulationInheritancePolymorphism;
+
+public class EncapsulationInheritancePolymorphism {
+
+    public static void main(String[] args) {
+        int a = 1;
+//        var b = 2;
+//        System.out.println(b);
+    }
+}

src/encapsulationInheritancePolymorphism/Main.java

@@ -0,0 +1,14 @@
+package encapsulationInheritancePolymorphism;
+
+public class Main {
+    public static void main(String[] args) {
+        Student student = new Student();
+
+
+
+
+        //...
+
+        student.setFaculty("FPM", "MO-22");
+    }
+}

src/encapsulationInheritancePolymorphism/Student.java

@@ -0,0 +1,18 @@
+package encapsulationInheritancePolymorphism;
+
+public class Student {
+    private String name;
+    private String surname;
+    private String group;
+    private String faculty;
+
+
+    public String getName() {
+        return name;
+    }
+
+    public void setFaculty(String faculty, String group) {
+        this.faculty = faculty;
+        this.group = group;
+    }
+}

src/test/A.java

@@ -0,0 +1,13 @@
+package test;
+
+public class A {
+    /*private*/ int f/* = 3*/;
+
+    public int getF() {
+        return f;
+    }
+
+    public void setF(int f) {
+        this.f = f;
+    }
+}

src/test/Main.java

@@ -0,0 +1,15 @@
+package test;
+
+public class Main {
+    public static void main(String[] args) {
+        A a = new A();
+        System.out.println(a.getF());
+        a.setF(1);
+        System.out.println(a.getF());
+
+        System.out.println(a.f);
+
+        int[] array = {1, 2, 1};
+        System.out.println(array.length);
+    }
+}