import java.io.FileInputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class ZipReaderExample {
    public static void main(String[] args) {
        String zipFilePath = "example.zip";

        try (FileInputStream fis = new FileInputStream(zipFilePath);
             ZipInputStream zis = new ZipInputStream(fis)) {

            ZipEntry entry;
            while ((entry = zis.getNextEntry()) != null) {
                System.out.println("File: " + entry.getName());
                System.out.println("Size: " + entry.getSize() + " bytes");

                // Чтение содержимого файла
                byte[] buffer = new byte[1024];
                int len;
                while ((len = zis.read(buffer)) > 0) {
                    // Здесь можно обработать данные, например, записать в другой файл
                    System.out.write(buffer, 0, len);
                }
                System.out.println("\n-------------------");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

public class Task180225 {
    public static void main(String[] args) {
        int a = 5; 
        int b = 3; 
        int result = a & b | a ^ b;
        System.out.println(result);
    }
}

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class ZipWriterExample {
    public static void main(String[] args) {
        String[] filesToZip = {"file1.txt", "file2.txt"};
        String zipFilePath = "output.zip";

        try (FileOutputStream fos = new FileOutputStream(zipFilePath);
             ZipOutputStream zos = new ZipOutputStream(fos)) {

            for (String file : filesToZip) {
                try (FileInputStream fis = new FileInputStream(file)) {
                    ZipEntry zipEntry = new ZipEntry(file);
                    zos.putNextEntry(zipEntry);

                    byte[] buffer = new byte[1024];
                    int len;
                    while ((len = fis.read(buffer)) > 0) {
                        zos.write(buffer, 0, len);
                    }
                    zos.closeEntry();
                }
            }
            System.out.println("ZIP-архив успешно создан: " + zipFilePath);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import java.util.Base64;

public class AESExample {
    public static void main(String[] args) throws Exception {
        // Генерация ключа
        KeyGenerator keyGen = KeyGenerator.getInstance("AES");
        keyGen.init(128); // 128-bit key
        SecretKey secretKey = keyGen.generateKey();

        // Шифрование
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        String plainText = "Hello, World!";
        byte[] encryptedBytes = cipher.doFinal(plainText.getBytes());
        String encryptedText = Base64.getEncoder().encodeToString(encryptedBytes);
        System.out.println("Encrypted: " + encryptedText);

        // Дешифрование
        cipher.init(Cipher.DECRYPT_MODE, secretKey);
        byte[] decryptedBytes = cipher.doFinal(Base64.getDecoder().decode(encryptedText));
        String decryptedText = new String(decryptedBytes);
        System.out.println("Decrypted: " + decryptedText);
    }
}

public class Task190225 {
    public static void main(String[] args) {
        String dateStr = "2013-13-12 23:31:50";
        try {
            LocalDateTime date = LocalDateTime.parse(dateStr, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
            System.out.println(date);
        } catch (DateTimeParseException e) {
            throw new IllegalArgumentException("Ошибка парсинга");
        }
    }
}

00 11 22 33 44 55 66 77 88 99 AA BB CC DD EE FF

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00 11 22 33 44 55 66 77 88 99 AA BB CC DD EE FF

00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

00^00 11^01 22^02 33^03 44^04 55^05 66^06 77^07 88^08 99^09 AA^0A BB^0B CC^0C DD^0D EE^0E FF^0F
= 00 10 20 30 40 50 60 70 80 90 A0 B0 C0 D0 E0 F0

63 7C 77 7B F2 6B 6F C5 30 01 67 2B FE D7 AB 76

63 7C 77 7B
6F C5 6B F2
67 2B FE D7
AB 76 30 01

BA 84 E8 1B
75 A4 8D 40
F4 8D 06 7D
7A 32 0E 5D

D6 AA 74 FD D2 AF 72 FA DA A6 78 F1 D6 AB 76 FE

BA^D6 84^AA E8^74 1B^FD
75^D2 A4^AF 8D^72 40^FA
F4^DA 8D^A6 06^78 7D^F1
7A^D6 32^AB 0E^76 5D^FE
= 6C 2E 9C E6
A7 0B FF BA
2E 2B 7E 8C
AC 99 78 A3

3A D7 7B B4
0D 7A 36 60
A8 9E CA F3
F6 1F 6C 2B

import javax.crypto.Cipher;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.util.Base64;

public class RSAExample {
    public static void main(String[] args) throws Exception {
        // Генерация ключей
        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
        keyGen.initialize(2048); // 2048-bit key
        KeyPair keyPair = keyGen.generateKeyPair();

        // Шифрование
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, keyPair.getPublic());
        String plainText = "Hello, World!";
        byte[] encryptedBytes = cipher.doFinal(plainText.getBytes());
        String encryptedText = Base64.getEncoder().encodeToString(encryptedBytes);
        System.out.println("Encrypted: " + encryptedText);

        // Дешифрование
        cipher.init(Cipher.DECRYPT_MODE, keyPair.getPrivate());
        byte[] decryptedBytes = cipher.doFinal(Base64.getDecoder().decode(encryptedText));
        String decryptedText = new String(decryptedBytes);
        System.out.println("Decrypted: " + decryptedText);
    }
}

import java.io.FileWriter;
import java.io.IOException;

public class Task200225 {
    public static void main(String[] args) {
        try (FileWriter writer = new FileWriter("output.txt")) {
            writer.write("Hello");
            writer.flush();
            writer.write(" World");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}