update Main with example for difference & and &&

src/Main.java

@@ -3,6 +3,33 @@ public class Main {
         System.out.println(args[2]);
         System.out.println("Hello world!");
 //        System.out.println(1);
+
+        int a = 1;
+        int b = 2;
+        int c = 1;
+        int d = 1;
+
+        System.out.println(2&1);
+        System.out.println(2|1);
+        int aa = 2;
+
+        /*if (aa) {
+
+        }*/
+
+//        System.out.println("a"&"b");
+        System.out.println('a'&'b');
+
+        if ((a > b) & MyBooleanMethod()) {
+            System.out.println("?????????????????????????");
+        }
+
+
+    }
+
+    static boolean MyBooleanMethod() {
+        System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
+        return true;
     }
 
     void myFunction() {

src/_12_Закревський_Данило_Сергійович/lab1/FirstLab.java

@@ -1,30 +0,0 @@
-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

@@ -1,63 +0,0 @@
-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

@@ -1,33 +0,0 @@
-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

@@ -1,59 +0,0 @@
-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

@@ -1,32 +0,0 @@
-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

@@ -1,139 +0,0 @@
-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

@@ -1,138 +0,0 @@
-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/inheritance/ElectricEngine.java

@@ -0,0 +1,9 @@
+package encapsulationInheritancePolymorphism.inheritance;
+
+public class ElectricEngine extends Engine {
+    private String batteryType;
+
+    /*private class Engine {
+        private int power;
+    }*/
+}

src/encapsulationInheritancePolymorphism/inheritance/Engine.java

@@ -0,0 +1,5 @@
+package encapsulationInheritancePolymorphism.inheritance;
+
+public class Engine {
+    private int power;
+}

src/encapsulationInheritancePolymorphism/inheritance/FuelEngine.java

@@ -0,0 +1,5 @@
+package encapsulationInheritancePolymorphism.inheritance;
+
+public class FuelEngine extends Engine {
+    private String fuelType;
+}

src/encapsulationInheritancePolymorphism/inheritance/Main.java

@@ -0,0 +1,8 @@
+package encapsulationInheritancePolymorphism.inheritance;
+
+public class Main {
+    public static void main(String[] args) {
+        ElectricEngine electricEngine = new ElectricEngine(); // створення нового об'єкту (екземпляру) класу ElectricEngine
+        FuelEngine fuelEngine = new FuelEngine();
+    }
+}

src/encapsulationInheritancePolymorphism/polymorphism/ElectricEngine.java

@@ -0,0 +1,14 @@
+package encapsulationInheritancePolymorphism.polymorphism;
+
+public class ElectricEngine extends Engine {
+    private String batteryType;
+
+    @Override
+    public int getPower() {
+        return 20;
+    }
+
+    /*private class Engine {
+        private int power;
+    }*/
+}

src/encapsulationInheritancePolymorphism/polymorphism/Engine.java

@@ -0,0 +1,9 @@
+package encapsulationInheritancePolymorphism.polymorphism;
+
+public class Engine {
+    private int power;
+
+    public int getPower() {
+        return power;
+    }
+}

src/encapsulationInheritancePolymorphism/polymorphism/FuelEngine.java

@@ -0,0 +1,10 @@
+package encapsulationInheritancePolymorphism.polymorphism;
+
+public class FuelEngine extends Engine {
+    private String fuelType;
+
+    @Override
+    public int getPower() {
+        return 50;
+    }
+}

src/encapsulationInheritancePolymorphism/polymorphism/Main.java

@@ -0,0 +1,38 @@
+package encapsulationInheritancePolymorphism.polymorphism;
+
+/*import encapsulationInheritancePolymorphism.inheritance.ElectricEngine;
+import encapsulationInheritancePolymorphism.inheritance.FuelEngine;*/
+
+public class Main {
+    public static void main(String[] args) {
+        /*encapsulationInheritancePolymorphism.inheritance.*/ElectricEngine electricEngine = new ElectricEngine(); // створення нового об'єкту (екземпляру) класу ElectricEngine
+        /*encapsulationInheritancePolymorphism.inheritance.*/FuelEngine fuelEngine = new FuelEngine();
+
+        Engine engine1 = fuelEngine;
+
+        Engine[] engines = {
+                electricEngine,
+                fuelEngine
+        };
+
+        for (Engine engine : engines) {
+            System.out.println(engine.getPower());
+        }
+
+        /*for (int i = 0; i < engines.length; i++) {
+            System.out.println(engines[i].getPower());
+        }*/
+
+//        +
+        int a = 1;
+        int b = 1;
+        int c = a + b;
+        System.out.println(c);
+
+
+        String sA = "1";
+        String sB = "1";
+        String sC = sA + sB;
+        System.out.println(sC);
+    }
+}

src/encapsulationInheritancePolymorphism/polymorphism/enhanced/ElectricEngine.java

@@ -0,0 +1,19 @@
+package encapsulationInheritancePolymorphism.polymorphism.enhanced;
+
+public class ElectricEngine extends Engine {
+    private String batteryType;
+    private int chargeLevel = 9;
+    private int criticalChargeLevel = 10;
+    private float coefficientCriticalPowerCut = 0.1f;
+
+    @Override
+    public int getPower() {
+        return chargeLevel > criticalChargeLevel
+                ? super.getPower()
+                : (int) (super.getPower() * coefficientCriticalPowerCut);
+    }
+
+    /*private class Engine {
+        private int power;
+    }*/
+}

src/encapsulationInheritancePolymorphism/polymorphism/enhanced/Engine.java

@@ -0,0 +1,9 @@
+package encapsulationInheritancePolymorphism.polymorphism.enhanced;
+
+public class Engine {
+    private int power = 100;
+
+    public int getPower() {
+        return power;
+    }
+}

src/encapsulationInheritancePolymorphism/polymorphism/enhanced/FuelEngine.java

@@ -0,0 +1,10 @@
+package encapsulationInheritancePolymorphism.polymorphism.enhanced;
+
+public class FuelEngine extends Engine {
+    private String fuelType;
+
+    /*public int getPower() {
+        return 50;
+    }*/
+
+}

src/encapsulationInheritancePolymorphism/polymorphism/enhanced/Main.java

@@ -0,0 +1,28 @@
+package encapsulationInheritancePolymorphism.polymorphism.enhanced;
+
+/*import encapsulationInheritancePolymorphism.inheritance.ElectricEngine;
+import encapsulationInheritancePolymorphism.inheritance.FuelEngine;*/
+
+public class Main {
+    public static void main(String[] args) {
+        /*encapsulationInheritancePolymorphism.inheritance.*/
+        ElectricEngine electricEngine = new ElectricEngine(); // створення нового об'єкту (екземпляру) класу ElectricEngine
+        /*encapsulationInheritancePolymorphism.inheritance.*/
+        FuelEngine fuelEngine = new FuelEngine();
+
+        Engine engine1 = fuelEngine;
+
+        Engine[] engines = {
+                electricEngine,
+                fuelEngine
+        };
+
+        for (Engine engine : engines) {
+            System.out.println(engine.getPower());
+        }
+
+        /*for (int i = 0; i < engines.length; i++) {
+            System.out.println(engines[i].getPower());
+        }*/
+    }
+}

src/encapsulationInheritancePolymorphism/polymorphism/overload/MyClassForOverloadExample.java

@@ -0,0 +1,17 @@
+package encapsulationInheritancePolymorphism.polymorphism.overload;
+
+public class MyClassForOverloadExample {
+    void myMethod(int a) {
+        System.out.println("Integer: " + a);
+    }
+
+    void myMethod(double a) {
+        System.out.println("Double: " + a);
+    }
+
+    public static void main(String[] args) {
+        MyClassForOverloadExample overload = new MyClassForOverloadExample();
+        overload.myMethod(1);
+        overload.myMethod(0.1);
+    }
+}