ADD

Counter2158.java

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+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class Counter2158 extends JFrame implements ActionListener {
+    private double result;
+    private JTextField resultField;
+
+    public Counter2158() {
+        super("Simple Calculator");
+        initializeCalculator();
+    }
+
+    private void initializeCalculator() {
+        this.result = 0;
+
+        // 创建布局
+        setLayout(new BorderLayout());
+
+        // 创建结果显示区域
+        resultField = new JTextField("0", 10);
+        resultField.setEditable(false);
+        add(resultField, BorderLayout.NORTH);
+
+        // 创建按钮面板
+        JPanel buttonPanel = new JPanel();
+        buttonPanel.setLayout(new GridLayout(4, 4));
+
+        // 添加按钮
+        String[] buttons = {"+", "-", "*", "/", "Reset", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9"};
+        for (String buttonText : buttons) {
+            JButton button = new JButton(buttonText);
+            button.addActionListener(this);
+            buttonPanel.add(button);
+        }
+
+        add(buttonPanel, BorderLayout.CENTER);
+
+        // 设置窗口属性
+        setSize(300, 200);
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        setLocationRelativeTo(null);
+        setVisible(true); // 显示窗口
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        String command = e.getActionCommand();
+
+        switch (command) {
+            case "+":
+                add(Double.parseDouble(resultField.getText()));
+                break;
+            case "-":
+                subtract(Double.parseDouble(resultField.getText()));
+                break;
+            case "*":
+                multiply(Double.parseDouble(resultField.getText()));
+                break;
+            case "/":
+                try {
+                    divide(Double.parseDouble(resultField.getText()));
+                } catch (IllegalArgumentException ex) {
+                    JOptionPane.showMessageDialog(this, ex.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
+                    reset();
+                }
+                break;
+            case "Reset":
+                reset();
+                break;
+            default:
+                add(Double.parseDouble(command));
+                break;
+        }
+
+        resultField.setText(String.valueOf(result));
+    }
+
+    public void add(double num) {
+        result += num;
+    }
+
+    public void subtract(double num) {
+        result -= num;
+    }
+
+    public void multiply(double num) {
+        result *= num;
+    }
+
+    public void divide(double num) {
+        if (num == 0) {
+            throw new IllegalArgumentException("Divisor cannot be zero.");
+        }
+        result /= num;
+    }
+
+    public void reset() {
+        result = 0;
+    }
+
+    public static void main(String[] args) {
+        SwingUtilities.invokeLater(Counter2158::new);
+    }
+}

Main.java

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+
+//TIP 要<b>运行</b>代码，请按 <shortcut actionId="Run"/> 或
+// 点击装订区域中的 <icon src="AllIcons.Actions.Execute"/> 图标。
+public class Main {
+    public static void main(String[] args) {
+        //TIP 当文本光标位于高亮显示的文本处时按 <shortcut actionId="ShowIntentionActions"/>
+        // 查看 IntelliJ IDEA 建议如何修正。
+        System.out.print("Hello and welcome!");
+
+        for (int i = 1; i <= 5; i++) {
+            //TIP 按 <shortcut actionId="Debug"/> 开始调试代码。我们已经设置了一个 <icon src="AllIcons.Debugger.Db_set_breakpoint"/> 断点
+            // 但您始终可以通过按 <shortcut actionId="ToggleLineBreakpoint"/> 添加更多断点。
+            System.out.println("i = " + i);
+        }}}