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‎students/23K0375/23K0375-p25/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>23K0375</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>23K0375-p25</artifactId>
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<description>Массивы</description>
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</project>

‎students/23K0375/23K0375-p25/src/main/java/ru/mirea/practice/s23k0375/task1/StrTest.java

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package ru.mirea.practice.s23k0375.task1;
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import java.util.Scanner;
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public final class StrTest {
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private StrTest() {
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throw new UnsupportedOperationException("Утилитный класс не должен быть создан");
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}
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public static void main(String[] args) {
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try (Scanner sc = new Scanner(System.in)) {
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System.out.println("Введите строку:");
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final String str = sc.nextLine();
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System.out.println("Выберите операцию:");
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System.out.println("1. Разбить строку на слова");
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System.out.println("2. Заменить все пробелы на дефисы");
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System.out.println("3. Найти все числа в строке");
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System.out.println("4. Удалить все цифры из строки");
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int option = sc.nextInt();
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sc.nextLine();
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switch (option) {
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case 1:
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String[] words = str.split("\\s+");
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System.out.println("Разбитые слова:");
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for (String word : words) {
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System.out.println(word);
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}
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break;
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case 2:
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String rep = str.replaceAll("\\s+", "-");
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System.out.println("Строка с замененными пробелами:");
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System.out.println(rep);
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break;
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case 3:
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String[] nums = str.split("\\D+");
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System.out.println("Найденные числа:");
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for (String num : nums) {
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if (!num.isEmpty()) {
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System.out.println(num);
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}
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}
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break;
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case 4:
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String noDigits = str.replaceAll("\\d", "");
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System.out.println("Строка без цифр:");
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System.out.println(noDigits);
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break;
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default:
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System.out.println("Неверный выбор");
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break;
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}
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}
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}
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}

‎students/23K0375/23K0375-p26/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>23K0375</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>23K0375-p26</artifactId>
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<description>Массивы</description>
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</project>

‎students/23K0375/23K0375-p26/src/main/java/ru/mirea/practice/s23k0375/task1/InvArr.java

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package ru.mirea.practice.s23k0375.task1;
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import java.util.Stack;
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public final class InvArr {
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private InvArr() {
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throw new UnsupportedOperationException("Utility class");
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}
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public static void invertArray(int[] arr) {
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Stack<Integer> stack = new Stack<>();
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for (int num : arr) {
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stack.push(num);
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}
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int i = 0;
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for (; i < arr.length; i++) {
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arr[i] = stack.pop();
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}
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}
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public static void main(String[] args) {
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int[] array = {11, 23, 36, 42, 58, 68, 75, 87, 99};
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System.out.println("Исходный массив:");
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for (int num : array) {
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System.out.print(num + " ");
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}
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System.out.println();
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invertArray(array);
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System.out.println("Инвертированный массив:");
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for (int num : array) {
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System.out.print(num + " ");
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}
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}
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}

‎students/23K0375/23K0375-p27/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>23K0375</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>23K0375-p27</artifactId>
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<description>Массивы</description>
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</project>

‎students/23K0375/23K0375-p27/src/main/java/ru/mirea/practice/s23k0375/task1/Hashtab.java

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package ru.mirea.practice.s23k0375.task1;
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import java.util.LinkedList;
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public class Hashtab {
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private static final int SIZE = 10;
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private LinkedList<Entry>[] table;
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static class Entry {
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String key;
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String value;
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Entry(String key, String value) {
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this.key = key;
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this.value = value;
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}
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}
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public void hashtabInit() {
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table = new LinkedList[SIZE];
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for (int i = 0; i < SIZE; i++) {
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table[i] = new LinkedList<>();
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}
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}
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public int hashtabHash(String key) {
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return Math.abs(key.hashCode() % SIZE);
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}
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public void hashtabAdd(String key, String value) {
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int index = hashtabHash(key);
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for (Entry entry : table[index]) {
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if (entry.key.equals(key)) {
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entry.value = value;
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return;
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}
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}
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table[index].add(new Entry(key, value));
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}
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public String hashtabLookup(String key) {
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int index = hashtabHash(key);
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for (Entry entry : table[index]) {
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if (entry.key.equals(key)) {
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return entry.value;
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}
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}
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return null;
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}
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public void hashtabDelete(String key) {
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int index = hashtabHash(key);
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table[index].removeIf(entry -> entry.key.equals(key));
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}
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public static void main(String[] args) {
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Hashtab hashtab = new Hashtab();
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hashtab.hashtabInit();
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for (int i = 1; i <= 10; i++) {
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hashtab.hashtabAdd("Key" + i, "Value" + i);
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}
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System.out.println("Поиск Key5: " + hashtab.hashtabLookup("Key5"));
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System.out.println("Поиск Key10: " + hashtab.hashtabLookup("Key10"));
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hashtab.hashtabDelete("Key5");
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System.out.println("Поиск Key5 после удаления: " + hashtab.hashtabLookup("Key5"));
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hashtab.hashtabAdd("Key10", "UpdatedValue10");
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System.out.println("Обновленное значение Key10: " + hashtab.hashtabLookup("Key10"));
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}
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}

‎students/23K0375/23K0375-p28/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>23K0375</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>23K0375-p28</artifactId>
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<description>Массивы</description>
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</project>

‎students/23K0375/23K0375-p28/src/main/java/ru/mirea/practice/s23k0375/task1/HashToEx.java

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package ru.mirea.practice.s23k0375.task1;
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import java.util.HashSet;
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import java.util.TreeSet;
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public abstract class HashToEx {
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public static void main(String[] args) {
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HashSet<String> hashSet = new HashSet<>();
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hashSet.add("geeks");
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hashSet.add("practice");
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hashSet.add("contribute");
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hashSet.add("ide");
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System.out.println("HashSet: " + hashSet);
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TreeSet<String> treeSet = new TreeSet<>(hashSet);
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System.out.println("TreeSet: " + treeSet);
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}
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}
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‎students/23K0375/23K0375-p29/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>23K0375</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>23K0375-p29</artifactId>
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<description>Массивы</description>
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</project>

‎students/23K0375/23K0375-p29/src/main/java/ru/mirea/practice/s23k0375/task1/Main.java

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package ru.mirea.practice.s23k0375.task1;
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public abstract class Main {
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public static void main(String[] args) {
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int n = 5;
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int cnt = 0;
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int[][] roadmatr = new int[n][n];
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for (int i = 0;i < n;i++) {
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roadmatr[0] = new int[]{0,1,0,0,0};
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roadmatr[1] = new int[]{1,0,1,1,0};
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roadmatr[2] = new int[]{0,1,0,0,0};
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roadmatr[3] = new int[]{0,1,0,0,0};
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roadmatr[4] = new int[]{0,0,0,0,0};
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for (int j = 0;j < n;j++) {
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//System.out.println(roadmatr[i][j]);
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if (roadmatr[i][j] == 1) {
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cnt += 1;
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}
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}
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//System.out.println("");
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}
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System.out.println("roadnum=" + cnt / 2);
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}
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}

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