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VertyshkaVertyshka
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Лабораторная работа 13-20
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‎students/23K0818/23K0818-p13/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<artifactId>23K0818</artifactId>
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<groupId>ru.mirea.practice</groupId>
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<version>2024.1</version>
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<relativePath>../pom.xml</relativePath>
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</parent>
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<artifactId>23K0818-p13</artifactId>
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</project>

‎students/23K0818/23K0818-p13/src/main/java/ru/mirea/practice/s0000001/task1/Shirt.java‎

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package ru.mirea.practice.s0000001.task1;
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public class Shirt {
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private String id;
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private String description;
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private String color;
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private String size;
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public Shirt(String id, String description, String color, String size) {
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this.id = id;
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this.description = description;
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this.color = color;
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this.size = size;
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}
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@Override
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public String toString() {
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return "ID: " + id + "\n"
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+ "Description: " + description + "\n"
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+ "Color: " + color + "\n"
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+ "Size: " + size + "\n";
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}
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public static Shirt fromString(String shirtString) {
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String[] parts = shirtString.split(",");
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if (parts.length == 4) {
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return new Shirt(parts[0], parts[1], parts[2], parts[3]);
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} else {
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throw new IllegalArgumentException("Invalid shirt string: " + shirtString);
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}
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}
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public static void main(String[] args) {
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String[] shirts = {
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"S001,Black Polo Shirt,Black,XL",
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"S002,Black Polo Shirt,Black,L",
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"S003,Blue Polo Shirt,Blue,XL",
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"S004,Blue Polo Shirt,Blue,M",
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"S005,Tan Polo Shirt,Tan,XL",
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"S006,Black T-Shirt,Black,XL",
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"S007,White T-Shirt,White,XL",
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"S008,White T-Shirt,White,L",
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"S009,Green T-Shirt,Green,S",
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"S010,Orange T-Shirt,Orange,S",
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"S011,Maroon Polo Shirt,Maroon,S"
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};
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Shirt[] shirtObjects = new Shirt[shirts.length];
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for (int i = 0; i < shirts.length; i++) {
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shirtObjects[i] = Shirt.fromString(shirts[i]);
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}
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for (Shirt shirt : shirtObjects) {
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System.out.println(shirt);
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}
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}
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}

‎students/23K0818/23K0818-p13/src/main/java/ru/mirea/practice/s0000001/task2/WordChain.java‎

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package ru.mirea.practice.s0000001.task2;
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import java.io.BufferedReader;
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import java.io.FileReader;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Locale;
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import java.util.Set;
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public final class WordChain {
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// Приватный конструктор, чтобы предотвратить создание экземпляров класса
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private WordChain() {
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throw new UnsupportedOperationException("Utility class");
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}
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public static void main(String[] args) {
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String fileName = System.console().readLine("Введите имя файла: ");
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try {
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List<String> words = readWordsFromFile(fileName);
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String result = getLine(words);
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System.out.println(result);
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} catch (IOException e) {
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System.err.println("Ошибка при чтении файла: " + e.getMessage());
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}
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}
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private static List<String> readWordsFromFile(String fileName) throws IOException {
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List<String> words = new ArrayList<>();
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try (BufferedReader reader = new BufferedReader(new FileReader(fileName))) {
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String line;
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while ((line = reader.readLine()) != null) {
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String[] parts = line.split("\\s+");
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for (String part : parts) {
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words.add(part.trim());
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}
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}
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}
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return words;
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}
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public static String getLine(List<String> words) {
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if (words == null || words.isEmpty()) {
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return "";
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}
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StringBuilder result = new StringBuilder();
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Set<String> usedWords = new HashSet<>();
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// Начинаем с первого слова
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String currentWord = words.get(0);
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result.append(currentWord);
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usedWords.add(currentWord);
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while (usedWords.size() < words.size()) {
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boolean foundNextWord = false;
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for (String word : words) {
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if (!usedWords.contains(word)
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&& currentWord.toLowerCase(Locale.ROOT).charAt(currentWord.length() - 1)
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== word.toLowerCase(Locale.ROOT).charAt(0)) {
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result.append(" ").append(word);
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usedWords.add(word);
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currentWord = word;
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foundNextWord = true;
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break;
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}
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}
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if (!foundNextWord) {
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break; // Если не нашли подходящего слова, выходим из цикла
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}
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}
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return result.toString();
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}
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}

‎students/23K0818/23K0818-p14/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<artifactId>23K0818</artifactId>
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<groupId>ru.mirea.practice</groupId>
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<version>2024.1</version>
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<relativePath>../pom.xml</relativePath>
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</parent>
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<artifactId>23K0818-p14</artifactId>
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</project>

‎students/23K0818/23K0818-p14/src/main/java/ru/mirea/practice/s0000001/task8/Filter.java‎

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package ru.mirea.practice.s0000001.task8;
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interface Filter {
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boolean apply(Object o);
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}

‎students/23K0818/23K0818-p14/src/main/java/ru/mirea/practice/s0000001/task8/FilterExample.java‎

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package ru.mirea.practice.s0000001.task8;
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import java.lang.reflect.Array;
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import java.util.ArrayList;
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import java.util.List;
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public abstract class FilterExample {
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// Метод filter, который принимает массив и реализацию интерфейса Filter
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public static <T> T[] filter(T[] array, Filter filter) {
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List<T> resultList = new ArrayList<>();
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for (T item : array) {
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if (filter.apply(item)) {
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resultList.add(item);
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}
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}
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// Преобразуем список обратно в массив правильного типа
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@SuppressWarnings("unchecked")
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T[] resultArray = (T[]) Array.newInstance(array.getClass().getComponentType(), resultList.size());
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resultArray = resultList.toArray(resultArray);
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return resultArray;
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}
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public static void main(String[] args) {
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String[] strings = {"apple", "banana", "cherry", "date", "elderberry"};
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// Фильтр для строк, который оставляет только строки, начинающиеся с буквы 'a'
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Filter stringFilter = new Filter() {
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@Override
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public boolean apply(Object o) {
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if (o instanceof String) {
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String s = (String) o;
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return s.startsWith("a");
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}
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return false;
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}
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};
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String[] filteredStrings = filter(strings, stringFilter);
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System.out.println("Filtered strings: " + java.util.Arrays.toString(filteredStrings));
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Integer[] numbers = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
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// Фильтр для чисел, который оставляет только четные числа
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Filter numberFilter = new Filter() {
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@Override
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public boolean apply(Object o) {
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if (o instanceof Integer) {
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Integer i = (Integer) o;
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return i % 2 == 0;
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}
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return false;
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}
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};
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Integer[] filteredNumbers = filter(numbers, numberFilter);
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System.out.println("Filtered numbers: " + java.util.Arrays.toString(filteredNumbers));
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}
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}

‎students/23K0818/23K0818-p14/src/main/java/ru/mirea/practice/s0000001/task9/FrequencyDictionary.java‎

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package ru.mirea.practice.s0000001.task9;
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import java.util.HashMap;
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import java.util.Locale;
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import java.util.Map;
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public abstract class FrequencyDictionary {
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public static void main(String[] args) {
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String text = "Съешь ещё этих мягких французских булок, да выпей же чаю.";
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// Получаем частотный словарь
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Map<Character, Integer> frequencyMap = buildFrequencyDictionary(text);
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for (Map.Entry<Character, Integer> entry : frequencyMap.entrySet()) {
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System.out.println("Буква: " + entry.getKey() + ", Частота: " + entry.getValue());
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}
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}
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public static Map<Character, Integer> buildFrequencyDictionary(String text) {
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Map<Character, Integer> frequencyMap = new HashMap<>();
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// Приводим текст к нижнему регистру с использованием Locale и удаляем все символы, кроме букв
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text = text.toLowerCase(Locale.getDefault()).replaceAll("[^а-я]", "");
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// Подсчитываем частоту каждой буквы
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for (char c : text.toCharArray()) {
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frequencyMap.put(c, frequencyMap.getOrDefault(c, 0) + 1);
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}
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return frequencyMap;
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}
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}

‎students/23K0818/23K0818-p15/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<artifactId>23K0818</artifactId>
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<groupId>ru.mirea.practice</groupId>
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<version>2024.1</version>
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<relativePath>../pom.xml</relativePath>
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</parent>
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<artifactId>23K0818-p15</artifactId>
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</project>

‎students/23K0818/23K0818-p15/src/main/java/ru/mirea/practice/s0000001/task2/CountryMenu.java‎

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package ru.mirea.practice.s0000001.task2;
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import javax.swing.JComboBox;
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import javax.swing.JFrame;
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import javax.swing.JLabel;
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import javax.swing.JPanel;
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import javax.swing.SwingConstants;
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import java.awt.BorderLayout;
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import java.awt.event.ActionEvent;
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import java.awt.event.ActionListener;
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import java.util.HashMap;
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import java.util.Map;
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public class CountryMenu extends JFrame {
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private JComboBox<String> countryComboBox;
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private JLabel infoLabel;
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private Map<String, String> countryInfoMap;
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public CountryMenu() {
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setTitle("Выбор страны");
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setSize(400, 200);
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setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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JPanel panel = new JPanel();
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panel.setLayout(new BorderLayout());
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countryComboBox = new JComboBox<>(new String[]{"Россия", "США", "Китай", "Германия", "Франция"});
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panel.add(countryComboBox, BorderLayout.NORTH);
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infoLabel = new JLabel();
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infoLabel.setHorizontalAlignment(SwingConstants.CENTER);
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panel.add(infoLabel, BorderLayout.CENTER);
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countryInfoMap = new HashMap<>();
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countryInfoMap.put("Россия", "Россия: Москва, рубль, 146 млн. человек.");
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countryInfoMap.put("США", "США: Вашингтон, доллар, 331 млн. человек.");
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countryInfoMap.put("Китай", "Китай: Пекин, юань, 1,4 млрд. человек.");
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countryInfoMap.put("Германия", "Германия: Берлин, евро, 83 млн. человек.");
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countryInfoMap.put("Франция", "Франция: Париж, евро, 67 млн. человек.");
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countryComboBox.addActionListener(new ActionListener() {
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@Override
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public void actionPerformed(ActionEvent e) {
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String selectedCountry = (String) countryComboBox.getSelectedItem();
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String info = countryInfoMap.get(selectedCountry);
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infoLabel.setText(info);
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}
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});
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add(panel);
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setVisible(true);
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}
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public static void main(String[] args) {
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new CountryMenu();
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}
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}

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