Лабораторная 21-32

Author: MishaKuraev

pom.xml

@@ -81,6 +81,7 @@
         <module>students/23K0186</module>
         <module>students/23K0755</module>
         <module>students/23K1292</module>
+        <module>students/23K0687</module>
     </modules>
     <dependencies>
         <dependency>

students/23K0687/23K0687-p21/pom.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <artifactId>23K0687</artifactId>
+        <groupId>ru.mirea.practice</groupId>
+        <version>2024.1</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <artifactId>23K0687-p21</artifactId>
+    <description>Практическая 21 Кураев М М</description>
+</project>

students/23K0687/23K0687-p21/src/main/java/ru/mirea/practice/s0000001/num1/Main.java

@@ -0,0 +1,24 @@
+package ru.mirea.practice.s0000001.num1;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public final class Main {
+    public static void main(String[] args) {
+        Object[] a = {1, "hello", 2, "world"};
+        List<Object> l = toList(a);
+        System.out.println("Конвертированный список: " + l);
+    }
+
+    public static List<Object> toList(Object[] a) {
+        List<Object> r = new ArrayList<>();
+        Collections.addAll(r, a);
+        return r;
+    }
+
+    private Main() {
+        throw new UnsupportedOperationException("Этот класс не предназначен для создания экземпляров");
+    }
+}
+

students/23K0687/23K0687-p21/src/main/java/ru/mirea/practice/s0000001/num2/Main.java

@@ -0,0 +1,13 @@
+package ru.mirea.practice.s0000001.num2;
+
+public final class Main {
+    public static void main(String[] args) {
+        Object[] a = {1, 2L, 3.14, "hello"};
+        MyArray m = new MyArray(a);
+        m.printArray();
+    }
+
+    private Main() {
+        throw new UnsupportedOperationException("Этот класс не предназначен для создания экземпляров");
+    }
+}

students/23K0687/23K0687-p21/src/main/java/ru/mirea/practice/s0000001/num2/MyArray.java

@@ -0,0 +1,16 @@
+package ru.mirea.practice.s0000001.num2;
+
+public class MyArray {
+    private Object[] arr;
+
+    public MyArray(Object[] arr) {
+        this.arr = arr;
+    }
+
+    public void printArray() {
+        System.out.print("Массив: ");
+        for (Object obj : arr) {
+            System.out.print(obj + " ");
+        }
+    }
+}

students/23K0687/23K0687-p21/src/main/java/ru/mirea/practice/s0000001/num3/Main.java

@@ -0,0 +1,17 @@
+package ru.mirea.practice.s0000001.num3;
+
+public final class Main {
+    public static void main(String[] args) {
+        Object[] a = {1, 2L, 3.14, "hello"};
+        Object e = getElement(a, 2);
+        System.out.println("Элемент на индексе 2: " + e);
+    }
+
+    public static Object getElement(Object[] a, int idx) {
+        return a[idx];
+    }
+
+    private Main() {
+        throw new UnsupportedOperationException("Этот класс не предназначен для создания экземпляров");
+    }
+}

students/23K0687/23K0687-p21/src/main/java/ru/mirea/practice/s0000001/num4/Main.java

@@ -0,0 +1,34 @@
+package ru.mirea.practice.s0000001.num4;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+
+public final class Main {
+    public static void main(String[] args) {
+        List<String> f = listFiles("путь_к_каталогу");
+        System.out.println("Первые 5 элементов:");
+        for (int i = 0; i < Math.min(5, f.size()); i++) {
+            System.out.println(f.get(i));
+        }
+    }
+
+    public static List<String> listFiles(String path) {
+        File dir = new File(path);
+        List<String> files = new ArrayList<>();
+        if (dir.isDirectory()) {
+            File[] fileList = dir.listFiles();
+            if (fileList != null) {
+                for (File file : fileList) {
+                    files.add(file.getName());
+                }
+            }
+        }
+        return files;
+    }
+
+    private Main() {
+        throw new UnsupportedOperationException("Этот класс не предназначен для создания экземпляров");
+    }
+}
+

students/23K0687/23K0687-p22/pom.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <artifactId>23K0687</artifactId>
+        <groupId>ru.mirea.practice</groupId>
+        <version>2024.1</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <artifactId>23K0687-p22</artifactId>
+    <description>Практическая 22 Кураев М М</description>
+</project>

students/23K0687/23K0687-p22/src/main/java/ru/mirea/practice/s0000001/num1/Main.java

@@ -0,0 +1,54 @@
+package ru.mirea.practice.s0000001.num1;
+
+import java.util.Stack;
+
+public final class Main {
+    public static void main(String[] args) {
+        String[] e = {"2", "3", "+", "5", "*"};
+        double r = evaluateReversePolishNotation(e);
+        System.out.println("Результат: " + r);
+    }
+
+    public static double evaluateReversePolishNotation(String[] e) {
+        Stack<Double> s = new Stack<>();
+        for (String t : e) {
+            if (isNum(t)) {
+                s.push(Double.parseDouble(t));
+            } else {
+                double b = s.pop();
+                double a = s.pop();
+                double res = applyOp(a, b, t);
+                s.push(res);
+            }
+        }
+        return s.pop();
+    }
+
+    public static boolean isNum(String t) {
+        try {
+            Double.parseDouble(t);
+            return true;
+        } catch (NumberFormatException ex) {
+            return false;
+        }
+    }
+
+    public static double applyOp(double a, double b, String op) {
+        switch (op) {
+            case "+":
+                return a + b;
+            case "-":
+                return a - b;
+            case "*":
+                return a * b;
+            case "/":
+                return a / b;
+            default:
+                throw new IllegalArgumentException("Неизвестный оператор: " + op);
+        }
+    }
+
+    private Main() {
+        throw new UnsupportedOperationException("Этот класс не предназначен для создания экземпляров");
+    }
+}

students/23K0687/23K0687-p23.a/pom.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <artifactId>23K0687</artifactId>
+        <groupId>ru.mirea.practice</groupId>
+        <version>2024.1</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <artifactId>23K0687-p23.a</artifactId>
+    <description>Практическая 23 Кураев М М</description>
+</project>