Лабораторная работа 21-30

students/23K0818/23K0818-p21/pom.xml

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+<?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>23K0818</artifactId>
+        <groupId>ru.mirea.practice</groupId>
+        <version>2024.1</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <artifactId>23K0818-p21</artifactId>
+</project>

students/23K0818/23K0818-p21/src/main/java/ru/mirea/practice/s0000001/task1/ArrayToListConverter.java

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+package ru.mirea.practice.s0000001.task1;
+
+import java.util.Arrays;
+import java.util.List;
+
+public abstract class ArrayToListConverter {
+
+
+    public static List<String> convertStringArrayToList(String[] array) {
+        return Arrays.asList(array);
+    }
+
+
+    public static List<Integer> convertIntegerArrayToList(Integer[] array) {
+        return Arrays.asList(array);
+    }
+
+    public static void main(String[] args) {
+
+        String[] stringArray = {"apple", "banana", "cherry"};
+        List<String> stringList = convertStringArrayToList(stringArray);
+        System.out.println("Список строк: " + stringList);
+
+
+        Integer[] integerArray = {1, 2, 3, 4, 5};
+        List<Integer> integerList = convertIntegerArrayToList(integerArray);
+        System.out.println("Список чисел: " + integerList);
+    }
+}

students/23K0818/23K0818-p21/src/main/java/ru/mirea/practice/s0000001/task2/GenericArray.java

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+package ru.mirea.practice.s0000001.task2;
+
+import java.util.Arrays;
+
+public abstract class GenericArray<T> {
+    private Object[] array;
+    private int size;
+
+    public GenericArray(int capacity) {
+        if (capacity <= 0) {
+            throw new IllegalArgumentException("Capacity must be greater than 0");
+        }
+        array = new Object[capacity];
+        size = 0;
+    }
+
+    public void add(T element) {
+        if (size == array.length) {
+            array = Arrays.copyOf(array, array.length * 2);
+        }
+        array[size++] = element;
+    }
+
+    public T get(int index) {
+        if (index < 0 || index >= size) {
+            throw new IndexOutOfBoundsException("Index out of bounds");
+        }
+        return (T) array[index];
+    }
+
+    public int size() {
+        return size;
+    }
+
+    public void set(int index, T element) {
+        if (index < 0 || index >= size) {
+            throw new IndexOutOfBoundsException("Index out of bounds");
+        }
+        array[index] = element;
+    }
+
+    public void remove(int index) {
+        if (index < 0 || index >= size) {
+            throw new IndexOutOfBoundsException("Index out of bounds");
+        }
+        System.arraycopy(array, index + 1, array, index, size - index - 1);
+        size--;
+    }
+
+    public boolean contains(T element) {
+        for (int i = 0; i < size; i++) {
+            if (array[i].equals(element)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public void clear() {
+        array = new Object[array.length];
+        size = 0;
+    }
+
+    @Override
+    public String toString() {
+        return Arrays.toString(Arrays.copyOf(array, size));
+    }
+}

students/23K0818/23K0818-p21/src/main/java/ru/mirea/practice/s0000001/task4/DirectoryContent.java

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+package ru.mirea.practice.s0000001.task4;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+
+public abstract class DirectoryContent {
+
+    public static void main(String[] args) {
+        String directoryPath = "your_directory_path_here";
+        List<String> directoryContents = getDirectoryContents(directoryPath);
+
+        for (int i = 0; i < Math.min(5, directoryContents.size()); i++) {
+            System.out.println(directoryContents.get(i));
+        }
+    }
+
+    public static List<String> getDirectoryContents(String directoryPath) {
+        List<String> contents = new ArrayList<>();
+        File directory = new File(directoryPath);
+
+        if (directory.exists() && directory.isDirectory()) {
+            File[] files = directory.listFiles();
+            if (files != null) {
+                for (File file : files) {
+                    contents.add(file.getName());
+                }
+            }
+        }
+        return contents;
+    }
+}

students/23K0818/23K0818-p22/pom.xml

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+<?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>23K0818</artifactId>
+        <groupId>ru.mirea.practice</groupId>
+        <version>2024.1</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <artifactId>23K0818-p22</artifactId>
+</project>

students/23K0818/23K0818-p22/src/main/java/ru/mirea/practice/s0000001/task1/RpnCalculator.java

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+package ru.mirea.practice.s0000001.task1;
+
+import java.util.Stack;
+
+public abstract class RpnCalculator {
+
+    public static double evaluaterpn(String[] tokens) {
+        Stack<Double> stack = new Stack<>();
+
+        for (String token : tokens) {
+            switch (token) {
+                case "+":
+                    stack.push(stack.pop() + stack.pop());
+                    break;
+                case "-":
+                    double subtrahend = stack.pop();
+                    stack.push(stack.pop() - subtrahend);
+                    break;
+                case "*":
+                    stack.push(stack.pop() * stack.pop());
+                    break;
+                case "/":
+                    double divisor = stack.pop();
+                    stack.push(stack.pop() / divisor);
+                    break;
+                default:
+                    stack.push(Double.parseDouble(token));
+                    break;
+            }
+        }
+        return stack.pop();
+    }
+
+    public static void main(String[] args) {
+        String[] expression = {"2", "3", "+", "4", "5", "*", "+"}; // (2 + 3) + (4 * 5)
+        System.out.println("Result: " + evaluaterpn(expression));
+    }
+}

students/23K0818/23K0818-p22/src/main/java/ru/mirea/practice/s0000001/task2/CalculatorApp.java

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+package ru.mirea.practice.s0000001.task2;
+
+public abstract class CalculatorApp {
+    public static void main(String[] args) {
+        CalculatorModel model = new CalculatorModel();
+        CalculatorView view = new CalculatorView();
+        new CalculatorController(model, view);
+
+        view.setVisible(true);
+    }
+}

students/23K0818/23K0818-p22/src/main/java/ru/mirea/practice/s0000001/task2/CalculatorController.java

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+package ru.mirea.practice.s0000001.task2;
+
+import javax.swing.JButton;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class CalculatorController {
+    public CalculatorController(CalculatorModel model, CalculatorView view) {
+        view.addButtonListener(new ActionListener() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                JButton source = (JButton) e.getSource();
+                String buttonText = source.getText();
+
+                if ("=".equals(buttonText)) {
+                    String expression = view.getDisplayText();
+                    String result = model.calculate(expression);
+                    view.setDisplayText(result);
+                } else {
+                    view.setDisplayText(view.getDisplayText() + buttonText + " ");
+                }
+            }
+        });
+    }
+}

students/23K0818/23K0818-p22/src/main/java/ru/mirea/practice/s0000001/task2/CalculatorModel.java

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+package ru.mirea.practice.s0000001.task2;
+
+import java.util.Stack;
+
+public class CalculatorModel {
+
+    public String calculate(String expression) {
+        Stack<Double> stack = new Stack<>();
+
+        String[] tokens = expression.split(" ");
+
+        try {
+            for (String token : tokens) {
+                if (isNumber(token)) {
+                    stack.push(Double.parseDouble(token));
+                } else {
+                    double b = stack.pop();
+                    double a = stack.pop();
+                    switch (token) {
+                        case "+":
+                            stack.push(a + b);
+                            break;
+                        case "-":
+                            stack.push(a - b);
+                            break;
+                        case "*":
+                            stack.push(a * b);
+                            break;
+                        case "/":
+                            stack.push(a / b);
+                            break;
+                        default:
+                            throw new IllegalArgumentException("Недопустимая операция");
+                    }
+                }
+            }
+            return String.valueOf(stack.pop());
+        } catch (Exception e) {
+            return "Ошибка";
+        }
+    }
+
+    private boolean isNumber(String token) {
+        try {
+            Double.parseDouble(token);
+            return true;
+        } catch (NumberFormatException e) {
+            return false;
+        }
+    }
+}

students/23K0818/23K0818-p22/src/main/java/ru/mirea/practice/s0000001/task2/CalculatorView.java

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+package ru.mirea.practice.s0000001.task2;
+
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+import javax.swing.JTextField;
+import java.awt.BorderLayout;
+import java.awt.Component;
+import java.awt.GridLayout;
+import java.awt.event.ActionListener;
+
+public class CalculatorView extends JFrame {
+    private final JTextField display = new JTextField();
+
+    public CalculatorView() {
+        setTitle("Калькулятор");
+        setSize(400, 500);
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        setLocationRelativeTo(null);
+        setLayout(new BorderLayout());
+
+        display.setEditable(false);
+        display.setHorizontalAlignment(JTextField.RIGHT);
+        add(display, BorderLayout.NORTH);
+
+        JPanel buttonPanel = new JPanel();
+        buttonPanel.setLayout(new GridLayout(4, 4));
+
+        String[] buttons = {"7", "8", "9", "/", "4", "5", "6", "*", "1", "2", "3", "-", "0", ".", "=", "+"};
+        for (String text : buttons) {
+            JButton button = new JButton(text);
+            buttonPanel.add(button);
+        }
+
+        add(buttonPanel, BorderLayout.CENTER);
+    }
+
+    public String getDisplayText() {
+        return display.getText();
+    }
+
+    public void setDisplayText(String text) {
+        display.setText(text);
+    }
+
+    public void addButtonListener(ActionListener listener) {
+        for (Component component : ((JPanel) getContentPane().getComponent(1)).getComponents()) {
+            if (component instanceof JButton) {
+                ((JButton) component).addActionListener(listener);
+            }
+        }
+    }
+}

students/23K0818/23K0818-p23/pom.xml

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+<?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>23K0818</artifactId>
+        <groupId>ru.mirea.practice</groupId>
+        <version>2024.1</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <artifactId>23K0818-p23</artifactId>
+</project>