夏晓静4/13代码更新

src/CalculatorGUI.java

@@ -2,92 +2,72 @@ import javax.swing.*;
 import java.awt.*;
 import java.awt.datatransfer.Clipboard;
 import java.awt.datatransfer.StringSelection;
-import java.awt.event.ActionEvent;
+import java.awt.event.*;
-import java.awt.event.ActionListener;
 import java.io.File;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.List;
 
-public class CalculatorGUI extends JFrame implements ActionListener {
+public class CalculatorGUI extends JFrame {
-    private JTextArea displayArea;
+
-    private JTextField inputField;
+    private List<String> history;
-    private ArrayList<String> history;
+    private JTextField displayField;
     private JTextArea historyArea;
 
     public CalculatorGUI() {
         history = new ArrayList<>();
 
-        // Set up the frame
         setTitle("Calculator");
-        setSize(400, 500);
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        setResizable(true);
         setLayout(new BorderLayout());
 
-        // Display area
+        JPanel buttonPanel = new JPanel(new GridLayout(5, 4));
-        JPanel displayPanel = new JPanel(new GridLayout(1, 2));
+        String[] buttonLabels = {
-        inputField = new JTextField();
+                "7", "8", "9", "/",
-        inputField.setEditable(false);
-        displayPanel.add(inputField);
-        historyArea = new JTextArea();
-        JScrollPane scrollPane = new JScrollPane(historyArea);
-        displayPanel.add(scrollPane);
-        add(displayPanel, BorderLayout.NORTH);
-
-        // Buttons
-        JPanel buttonPanel = new JPanel(new GridLayout(4, 4));
-        String[] buttonLabels = {"7", "8", "9", "/",
                 "4", "5", "6", "*",
                 "1", "2", "3", "-",
-                "C", "0", "=", "+"};
+                "C", "0", "=", "+",
+                "x²", "x³", "√x", "x⁴"
+        };
         for (String label : buttonLabels) {
             JButton button = new JButton(label);
-            button.addActionListener(this);
+            button.addActionListener(new ButtonListener());
             buttonPanel.add(button);
         }
-        add(buttonPanel, BorderLayout.CENTER);
 
-        // Save, Copy, Clear buttons
+        displayField = new JTextField(20);
+        displayField.setEditable(false);
+        displayField.setHorizontalAlignment(SwingConstants.RIGHT);
+
+        historyArea = new JTextArea(10, 20);
+        historyArea.setEditable(false);
+        JScrollPane scrollPane = new JScrollPane(historyArea);
+
         JPanel controlPanel = new JPanel(new FlowLayout());
-        JButton saveButton = new JButton("Save");
+        JButton saveButton = new JButton("Save History");
         saveButton.addActionListener(new SaveListener());
-        JButton copyButton = new JButton("Copy");
+        JButton copyButton = new JButton("Copy Selection");
         copyButton.addActionListener(new CopyListener());
-        JButton clearButton = new JButton("Clear");
+        JButton clearButton = new JButton("Clear History");
         clearButton.addActionListener(new ClearListener());
         controlPanel.add(saveButton);
         controlPanel.add(copyButton);
         controlPanel.add(clearButton);
+
+        add(displayField, BorderLayout.NORTH);
+        add(buttonPanel, BorderLayout.CENTER);
+        add(scrollPane, BorderLayout.EAST);
         add(controlPanel, BorderLayout.SOUTH);
 
+        pack();
         setVisible(true);
     }
 
-    @Override
+    private void appendToHistory(String entry) {
-    public void actionPerformed(ActionEvent e) {
+        history.add(entry);
-        String command = e.getActionCommand();
+        displayHistory();
-        switch (command) {
-            case "C":
-                inputField.setText("");
-                break;
-            case "=":
-                calculate();
-                break;
-            default:
-                inputField.setText(inputField.getText() + command);
-        }
-    }
-
-    private void calculate() {
-        String expression = inputField.getText();
-        try {
-            String result = String.valueOf(eval(expression));
-            history.add(expression + " = " + result);
-            displayHistory();
-            inputField.setText(result);
-        } catch (NumberFormatException | ArithmeticException e) {
-            inputField.setText("Error");
-        }
     }
 
     private double eval(String expression) {
@@ -161,20 +141,66 @@ public class CalculatorGUI extends JFrame implements ActionListener {
         historyArea.setText(sb.toString());
     }
 
+    private class ButtonListener implements ActionListener {
+        @Override
+        public void actionPerformed(ActionEvent e) {
+            String command = e.getActionCommand();
+            if (!command.equals("=")) {
+                if (command.equals("x²") || command.equals("x³") || command.equals("√x") || command.equals("x⁴")) {
+                    // 计算函数值
+                    String expression = displayField.getText();
+                    double result = calculateFunction(expression, command);
+                    displayField.setText(Double.toString(result));
+                } else {
+                    displayField.setText(displayField.getText() + command);
+                }
+            } else {
+                // Evaluate expression
+                String expression = displayField.getText();
+                try {
+                    double result = eval(expression);
+                    appendToHistory(expression + " = " + result);
+                    displayField.setText(Double.toString(result));
+                } catch (Exception ex) {
+                    appendToHistory("Error: " + ex.getMessage());
+                }
+            }
+        }
+    }
+
+    private double calculateFunction(String expression, String function) {
+        // 根据不同的函数类型计算结果
+        double value = Double.parseDouble(expression);
+        switch (function) {
+            case "x²":
+                return value * value;
+            case "x³":
+                return value * value * value;
+            case "√x":
+                return Math.sqrt(value);
+            case "x⁴":
+                return value * value * value * value;
+            default:
+                return 0;
+        }
+    }
+
     private class SaveListener implements ActionListener {
         @Override
         public void actionPerformed(ActionEvent e) {
-            try {
+            JFileChooser fileChooser = new JFileChooser();
-                File file = new File("calculator_history.txt");
+            int result = fileChooser.showSaveDialog(null);
-                FileWriter writer = new FileWriter(file);
+            if (result == JFileChooser.APPROVE_OPTION) {
-                for (String entry : history) {
+                File file = fileChooser.getSelectedFile();
-                    writer.write(entry + "\n");
+                try (FileWriter writer = new FileWriter(file)) {
+                    for (String entry : history) {
+                        writer.write(entry + "\n");
+                    }
+                    writer.flush();
+                    JOptionPane.showMessageDialog(null, "History saved successfully!");
+                } catch (IOException ex) {
+                    JOptionPane.showMessageDialog(null, "Error saving history: " + ex.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
                 }
-                writer.close();
-                JOptionPane.showMessageDialog(CalculatorGUI.this, "History saved successfully");
-            } catch (IOException ex) {
-                ex.printStackTrace();
-                JOptionPane.showMessageDialog(CalculatorGUI.this, "Error saving history");
             }
         }
     }
@@ -182,12 +208,10 @@ public class CalculatorGUI extends JFrame implements ActionListener {
     private class CopyListener implements ActionListener {
         @Override
         public void actionPerformed(ActionEvent e) {
-            String selectedText = historyArea.getSelectedText();
+            StringSelection selection = new StringSelection(historyArea.getSelectedText());
-            if (selectedText != null) {
+            Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
-                StringSelection selection = new StringSelection(selectedText);
+            clipboard.setContents(selection, null);
-                Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
+            JOptionPane.showMessageDialog(null, "Selection copied to clipboard!");
-                clipboard.setContents(selection, null);
-            }
         }
     }
 
@@ -195,10 +219,11 @@ public class CalculatorGUI extends JFrame implements ActionListener {
         @Override
         public void actionPerformed(ActionEvent e) {
             history.clear();
-            historyArea.setText("");
+            displayHistory();
         }
     }
 
+
     public static void main(String[] args) {
         new CalculatorGUI();
     }