public class IfElseExample {
    public static void main(String[] args) {
        int number = 10;

        if (number > 0) { // условие первое
            System.out.println("The number is positive.");
        } else if (number < 0) { // дополнительное условие
            System.out.println("The number is negative.");
        } else { // блок "иначе", срабатывающий если условие в if равно false
            System.out.println("The number is zero.");
        }
    }
}

public class SwitchExample {
    public static void main(String[] args) {
        int dayOfWeek = 3;

        switch (dayOfWeek) {
            case 1:
                System.out.println("Monday");
                break;
            case 2:
                System.out.println("Tuesday");
                break;
            case 3:
                System.out.println("Wednesday");
                break;
            case 4:
                System.out.println("Thursday");
                break;
            case 5:
                System.out.println("Friday");
                break;
            case 6:
                System.out.println("Saturday");
                break;
            case 7:
                System.out.println("Sunday");
                break;
            default:
                System.out.println("Invalid day of the week.");
                break;
        }
    }
}

public class ForLoopExample {
    public static void main(String[] args) {
        for (int i = 1; i <= 5; i++) {
            System.out.println("Iteration: " + i);
        }
    }
}

public class WhileLoopExample {
    public static void main(String[] args) {
        int i = 1;

        while (i <= 5) {
            System.out.println("Iteration: " + i);
            i++;
        }
    }
}

public class DoWhileLoopExample {
    public static void main(String[] args) {
        int i = 1;

        do {
            System.out.println("Iteration: " + i);
            i++;
        } while (i <= 5);
    }
}

int[] numbers;

int numbers[];

numbers = new int[5]; // Массив для 5 элементов

int[] numbers = new int[5];

int[] numbers = {1, 2, 3, 4, 5};

double[] decimals = new double[10]; // Массив для хранения 10 дробных чисел
char[] characters = {'a', 'b', 'c'}; // Массив символов
String[] words = {"Hello", "world"}; // Массив строк

int firstNumber = numbers[0]; // Получение первого элемента массива
numbers[1] = 10; // Присвоение значения второму элементу массива

public class ArrayExample {
    public static void main(String[] args) {
        int[] numbers = {1, 2, 3, 4, 5};

        // Вывод всех элементов массива
        for (int i = 0; i < numbers.length; i++) {
            System.out.println("Element at index " + i + ": " + numbers[i]);
        }
    }
}

public class Main {
    public static void main(String[] args) {
        int x = 15;
        int y = 10;
        String result;

        if (x > y) {
            if (x % y == 0) {
                result = "A";
            } else {
                result = "B";
            }
        } else if (x < y) {
            result = "C";
        } else {
            result = "D";
        }

        System.out.println(result);
    }
}

int[] numbers = {1, 2, 3, 4, 5};

for (int i = 0; i < numbers.length; i++) {
    System.out.println("Element at index " + i + ": " + numbers[i]);
}

int[] numbers = {1, 2, 3, 4, 5};
int i = 0;

while (i < numbers.length) {
    System.out.println("Element at index " + i + ": " + numbers[i]);
    i++;
}

int[] numbers = {1, 2, 3, 4, 5};

for (int number : numbers) {
    System.out.println("Element: " + number);
}

int[] numbers = {1, 2, 3, 4, 5};
numbers[2] = 10; // Изменение третьего элемента массива
System.out.println(numbers[2]); // Выведет 10

int[] numbers = {1, 2, 3, 4, 5};
int searchElement = 3;
boolean found = false;

for (int number : numbers) {
    if (number == searchElement) {
        found = true;
        break;
    }
}
if (found) {
    System.out.println("Element found");
} else {
    System.out.println("Element not found");
}

int[] original = {1, 2, 3, 4, 5};
int[] copy = new int[original.length];
System.arraycopy(original, 0, copy, 0, original.length);

int[] numbers = {5, 2, 4, 1, 3};
Arrays.sort(numbers);

int[] numbers = {1, 2, 3, 4, 5};
int index = Arrays.binarySearch(numbers, 3);

public class MaxValueInArray {
    public static void main(String[] args) {
        int[] numbers = {1, 2, 3, 4, 5};
        int max = numbers[0];

        for (int number : numbers) {
            if (number > max) {
                max = number;
            }
        }
        System.out.println("Maximum value: " + max);
    }
}

public class Person {
    String name;
    int age;

    void greet() {
        System.out.println("Hello, my name is " + name);
    }
}

public class Main {
    public static void main(String[] args) {
        Person person1 = new Person();
        person1.name = "John";
        person1.age = 30;
        person1.greet(); // Выведет "Hello, my name is John"
    }
}

public class Main {
    public static void main(String[] args) {
        int sum = 0;
        int i = 0;

        for (i = 1; i <= 5; i++) {
            if (i % 2 == 0) {
                continue;
            }
            sum += i;
        }

        int j = 5;
        while (j > 0) {
            if (j % 2 == 0) {
                j--;
                continue;
            }
            sum += j;
            j--;
        }

        System.out.println(sum);
    }
}

public class Person {
    String name;
    int age;

    void greet() {
        System.out.println("Hello, my name is " + name);
    }
}

Person person1 = new Person();

person1.name = "John";
person1.age = 30;

person1.greet(); // Выведет "Hello, my name is John"

public class Person {
    String name;
    int age;

    // Конструктор
    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    void greet() {
        System.out.println("Hello, my name is " + name);
    }
}

public class Main {
    public static void main(String[] args) {
        Person person1 = new Person("John", 30);
        person1.greet(); // Выведет "Hello, my name is John"
    }
}

public class Person {
    String name;
    int age;

    // Конструктор по умолчанию
    public Person() {
        this.name = "Unknown";
        this.age = 0;
    }

    // Конструктор с параметрами
    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    void greet() {
        System.out.println("Hello, my name is " + name);
    }
}

public class Main {
    public static void main(String[] args) {
        Person person1 = new Person();
        Person person2 = new Person("Alice", 25);
        person1.greet(); // Выведет "Hello, my name is Unknown"
        person2.greet(); // Выведет "Hello, my name is Alice"
    }
}

public class Person {
    String name;
    int age;

    void greet() {
        System.out.println("Hello, my name is " + name);
    }

    // Метод с параметрами
    void setAge(int newAge) {
        age = newAge;
    }

    // Метод с возвращаемым значением
    int getAge() {
        return age;
    }
}

public class Main {
    public static void main(String[] args) {
        Person person = new Person("John", 30);
        person.greet(); // Выведет "Hello, my name is John"
        person.setAge(35);
        System.out.println("Age: " + person.getAge()); // Выведет "Age: 35"
    }
}

public class Car {
    String model;
    int year;

    public Car(String model, int year) {
        this.model = model;
        this.year = year;
    }

    void displayInfo() {
        System.out.println("Model: " + model + ", Year: " + year);
    }
}

public class Main {
    public static void main(String[] args) {
        Car car1 = new Car("Toyota", 2020);
        Car car2 = new Car("Honda", 2018);
        car1.displayInfo(); // Выведет "Model: Toyota, Year: 2020"
        car2.displayInfo(); // Выведет "Model: Honda, Year: 2018"
    }
}