public static void bubbleSort(int[] numbers) {
  
        int n = numbers.length;
        int temp = 0;
  
        for (int i = 0; i < n; i++) {
            for (int j = 1; j < (n - i); j++) {
  
                if (numbers[j - 1] > numbers[j]) {
                    //swap elements
                    temp = numbers[j - 1];
                    numbers[j - 1] = numbers[j];
                    numbers[j] = temp;
                }
            }
        }
    }

    public static void shakerSort(int arr[]) {
        int buff;
        int left = 0;
        int right = arr.length - 1;
        do {
            for (int i = left; i < right; i++) {
                if (arr[i] > arr[i + 1]) {
                    buff = arr[i];
                    arr[i] = arr[i + 1];
                    arr[i + 1] = buff;
                }
            }
            right--;
            for (int i = right; i > left; i--) {
                if (arr[i] < arr[i - 1]) {
                    buff = arr[i];
                    arr[i] = arr[i - 1];
                    arr[i - 1] = buff;
                }
            }
            left++;
        } while (left < right);

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;

class Person implements Serializable {
    private static final long serialVersionUID = 1L;
    private String name;
    private int age;

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

    @Override
    public String toString() {
        return "Person{name='" + name + "', age=" + age + '}';
    }
}

public class ObjectOutputStreamExample {
    public static void main(String[] args) {
        Person person = new Person("John Doe", 30);

        try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("person.ser"))) {
            oos.writeObject(person);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;

public class ObjectInputStreamExample {
    public static void main(String[] args) {
        try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream("person.ser"))) {
            Person person = (Person) ois.readObject();
            System.out.println(person);
        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}

public class VariableTypesExample {
    static int classVariable = 10; // Class variable
    
    public static void main(String[] args) {
        int localVariable = 5; // Local variable
        VariableTypesExample example = new VariableTypesExample();
        example.instanceMethod();
        staticMethod();
        
        System.out.println("Class Variable: " + classVariable);
        System.out.println("Local Variable: " + localVariable);
        System.out.println("Instance Variable: " + example.instanceVariable);
    }
    
    int instanceVariable = 20; // Instance variable
    
    void instanceMethod() {
        classVariable = 15;
        instanceVariable = 25;
    }
    
    static void staticMethod() {
        classVariable = 30;
    }
}

import java.io.Serializable;

class Person implements Serializable {
    private static final long serialVersionUID = 1L;
    private String name;
    private int age;

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

    @Override
    public String toString() {
        return "Person{name='" + name + "', age=" + age + '}';
    }
}

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;

public class SerializationExample {
    public static void main(String[] args) {
        Person person = new Person("John Doe", 30);

        try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("person.ser"))) {
            oos.writeObject(person);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;

public class DeserializationExample {
    public static void main(String[] args) {
        try (ObjectInputStream ois = new ObjectInputStream(new FileInputStream("person.ser"))) {
            Person person = (Person) ois.readObject();
            System.out.println(person);
        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}

class Person implements Serializable {
    private static final long serialVersionUID = 1L;
    // остальные поля и методы
}

class User implements Serializable {
    private static final long serialVersionUID = 1L;
    private String username;
    private transient String password;

    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{username='" + username + "', password='" + password + "'}";
    }
}

public class WrapperExample {
    public static void main(String[] args) {
        Integer integerObject = Integer.valueOf(10);
        int intValue = integerObject.intValue();
        System.out.println("Integer value: " + intValue);

        String str = "20";
        int parsedInt = Integer.parseInt(str);
        System.out.println("Parsed integer: " + parsedInt);
    }
}

public class WrapperExample {
    public static void main(String[] args) {
        Double doubleObject = Double.valueOf(10.5);
        double doubleValue = doubleObject.doubleValue();
        System.out.println("Double value: " + doubleValue);

        String str = "20.5";
        double parsedDouble = Double.parseDouble(str);
        System.out.println("Parsed double: " + parsedDouble);
    }
}

public class WrapperExample {
    public static void main(String[] args) {
        Character charObject = Character.valueOf('a');
        char charValue = charObject.charValue();
        System.out.println("Character value: " + charValue);

        char upperChar = Character.toUpperCase(charValue);
        System.out.println("Upper case: " + upperChar);

        boolean isLetter = Character.isLetter(charValue);
        System.out.println("Is letter: " + isLetter);
    }
}

public class BoxingExample {
    public static void main(String[] args) {
        Integer a = 1000;
        Integer b = 1000;
        Integer c = 10;
        Integer d = 10;

        System.out.println(a == b);
        System.out.println(c == d);
    }
}