Лабораторная работа №22

students/23K0815/23K0815-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>23K0815</artifactId>
+        <groupId>ru.mirea.practice</groupId>
+        <version>2024.1</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <artifactId>23K0815-p22</artifactId>
+    <description>Массивы</description>
+</project>

students/23K0815/23K0815-p22/src/main/java/ru/mirea/practice/s0000001/task1/RpnCalculator.java

@@ -0,0 +1,62 @@
+package ru.mirea.practice.s0000001.task1;
+
+import java.util.Scanner;
+import java.util.Stack;
+
+public abstract class RpnCalculator {
+
+    public static double evaluate(String expression) {
+        Stack<Double> stack = new Stack<>();
+
+        // Разделяем входную строку на элементы
+        String[] tokens = expression.split(" ");
+
+        for (String token : tokens) {
+            switch (token) {
+                case "+":
+                    stack.push(stack.pop() + stack.pop());
+                    break;
+                case "-":
+                    double subtrahend = stack.pop();
+                    double minuend = stack.pop();
+                    stack.push(minuend - subtrahend);
+                    break;
+                case "*":
+                    stack.push(stack.pop() * stack.pop());
+                    break;
+                case "/":
+                    double divisor = stack.pop();
+                    double dividend = stack.pop();
+                    stack.push(dividend / divisor);
+                    break;
+                default:
+                    // Если токен не оператор, то предполагаем, что это число
+                    stack.push(Double.parseDouble(token));
+                    break;
+            }
+        }
+
+        // Результат будет единственным элементом в стеке
+        return stack.pop();
+    }
+
+    public static void main(String[] args) {
+        // Используем try-with-resources для безопасного закрытия Scanner
+        try (Scanner scanner = new Scanner(System.in)) {
+            System.out.print("Введите выражение в обратной польской нотации (RPN): ");
+
+            String expression = scanner.nextLine();
+
+            if (expression != null && !expression.trim().isEmpty()) {
+                try {
+                    double result = evaluate(expression);
+                    System.out.println("Результат: " + result);
+                } catch (Exception e) {
+                    System.out.println("Ошибка: " + e.getMessage());
+                }
+            } else {
+                System.out.println("Вы не ввели выражение.");
+            }
+        }
+    }
+}

students/23K0815/23K0815-p22/src/main/java/ru/mirea/practice/s0000001/task2/CalculatorController.java

@@ -0,0 +1,53 @@
+package ru.mirea.practice.s0000001.task2;
+
+import javax.swing.JButton;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class CalculatorController {
+    private final CalculatorModel model; // Instance variable
+    private final CalculatorView view; // Instance variable
+
+    public CalculatorController(CalculatorModel model, CalculatorView view) {
+        this.model = model;
+        this.view = view;
+
+        this.view.addCalculateListener(new CalculateListener());
+        this.view.addNumberButtonListener(new NumberButtonListener());
+        this.view.addOperationButtonListener(new OperationButtonListener());
+    }
+
+    private class CalculateListener implements ActionListener {
+        @Override
+        public void actionPerformed(ActionEvent e) {
+            String input = view.getInput();
+            try {
+                double result = model.evaluate(input);
+                view.setResult("Результат: " + result);
+            } catch (Exception ex) {
+                view.setResult("Ошибка: " + ex.getMessage());
+            }
+        }
+    }
+
+    private class NumberButtonListener implements ActionListener {
+        @Override
+        public void actionPerformed(ActionEvent e) {
+            JButton source = (JButton) e.getSource();
+            view.setInput(view.getInput() + source.getText());
+        }
+    }
+
+    private class OperationButtonListener implements ActionListener {
+        @Override
+        public void actionPerformed(ActionEvent e) {
+            JButton source = (JButton) e.getSource();
+            String operation = source.getText();
+            if ("C".equals(operation)) {
+                view.setInput("");
+            } else {
+                view.setInput(view.getInput() + " " + operation + " ");
+            }
+        }
+    }
+}

students/23K0815/23K0815-p22/src/main/java/ru/mirea/practice/s0000001/task2/CalculatorModel.java

@@ -0,0 +1,35 @@
+package ru.mirea.practice.s0000001.task2;
+
+import java.util.Stack;
+
+public class CalculatorModel {
+    public double evaluate(String expression) {
+        Stack<Double> stack = new Stack<>();
+        String[] tokens = expression.trim().split("\\s+");
+
+        for (String token : tokens) {
+            switch (token) {
+                case "+":
+                    stack.push(stack.pop() + stack.pop());
+                    break;
+                case "-":
+                    double subtrahend = stack.pop();
+                    double minuend = stack.pop();
+                    stack.push(minuend - subtrahend);
+                    break;
+                case "*":
+                    stack.push(stack.pop() * stack.pop());
+                    break;
+                case "/":
+                    double divisor = stack.pop();
+                    double dividend = stack.pop();
+                    stack.push(dividend / divisor);
+                    break;
+                default:
+                    stack.push(Double.parseDouble(token));
+                    break;
+            }
+        }
+        return stack.pop();
+    }
+}

students/23K0815/23K0815-p22/src/main/java/ru/mirea/practice/s0000001/task2/CalculatorView.java

@@ -0,0 +1,86 @@
+package ru.mirea.practice.s0000001.task2;
+
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JTextArea;
+import javax.swing.JTextField;
+import java.awt.GridLayout;
+import java.awt.event.ActionListener;
+
+public class CalculatorView {
+    private final JTextField inputField;
+    private final JTextArea resultArea;
+    private final JButton[] numberButtons;
+    private final JButton[] operationButtons;
+    private final JButton calculateButton;
+    private final String[] operations = {"+", "-", "*", "/", "C"};
+
+    public CalculatorView() {
+        final JFrame frame = new JFrame("RPN Calculator"); // Объявление как final и инициализация
+        inputField = new JTextField(20);
+        resultArea = new JTextArea(10, 30);
+        calculateButton = new JButton("Вычислить");
+
+        numberButtons = new JButton[10];
+        for (int i = 0; i < 10; i++) {
+            numberButtons[i] = new JButton(String.valueOf(i));
+        }
+
+        operationButtons = new JButton[operations.length];
+        for (int i = 0; i < operations.length; i++) {
+            operationButtons[i] = new JButton(operations[i]);
+        }
+
+        JPanel panel = new JPanel();
+        panel.setLayout(new GridLayout(5, 4));
+
+        panel.add(new JLabel("Введите выражение (RPN):"));
+        panel.add(inputField);
+        panel.add(calculateButton);
+        panel.add(resultArea);
+
+        for (JButton numberButton : numberButtons) {
+            panel.add(numberButton);
+        }
+
+        for (JButton operationButton : operationButtons) {
+            panel.add(operationButton);
+        }
+
+        resultArea.setEditable(false);
+        frame.add(panel);
+        frame.setSize(400, 400);
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        frame.setVisible(true); // Первое использование переменной frame
+    }
+
+    public String getInput() {
+        return inputField.getText();
+    }
+
+    public void setInput(String input) {
+        inputField.setText(input);
+    }
+
+    public void setResult(String result) {
+        resultArea.setText(result);
+    }
+
+    public void addCalculateListener(ActionListener listenForCalcButton) {
+        calculateButton.addActionListener(listenForCalcButton);
+    }
+
+    public void addNumberButtonListener(ActionListener listener) {
+        for (JButton numberButton : numberButtons) {
+            numberButton.addActionListener(listener);
+        }
+    }
+
+    public void addOperationButtonListener(ActionListener listener) {
+        for (JButton operationButton : operationButtons) {
+            operationButton.addActionListener(listener);
+        }
+    }
+}

students/23K0815/23K0815-p22/src/main/java/ru/mirea/practice/s0000001/task2/RpnCalculatorApp.java

@@ -0,0 +1,12 @@
+package ru.mirea.practice.s0000001.task2;
+
+public abstract class RpnCalculatorApp {
+    public static void main(String[] args) {
+        // Create instances of the model and view
+        CalculatorModel model = new CalculatorModel();
+        CalculatorView view = new CalculatorView();
+
+        // Create the controller
+        new CalculatorController(model, view);
+    }
+}

students/23K0815/pom.xml

@@ -29,5 +29,6 @@
         <module>23K0815-p19</module>
         <module>23K0815-p20</module>
         <module>23K0815-p21</module>
+        <module>23K0815-p22</module>
     </modules>
 </project>