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128 lines
3.9 KiB
128 lines
3.9 KiB
package xzk;
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import javax.swing.*;
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import java.awt.*;
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import java.awt.event.ActionEvent;
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import java.awt.event.ActionListener;
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public class Calculator extends JFrame implements ActionListener {
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private JTextField num1Field, num2Field, resultField;
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private JComboBox<String> operatorBox;
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public Calculator() {
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super("简单计算器");
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setLayout(new BorderLayout());
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// 创建面板
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JPanel inputPanel = new JPanel(new GridBagLayout());
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GridBagConstraints gbc = new GridBagConstraints();
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gbc.insets = new Insets(5, 5, 5, 5); // 设置组件之间的间距
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// 创建输入字段和标签
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gbc.gridx = 0;
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gbc.gridy = 0;
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inputPanel.add(new JLabel("第一个数字:"), gbc);
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gbc.gridx = 1;
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num1Field = new JTextField(10);
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inputPanel.add(num1Field, gbc);
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gbc.gridy = 1;
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gbc.gridx = 0;
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inputPanel.add(new JLabel("第二个数字:"), gbc);
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gbc.gridx = 1;
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num2Field = new JTextField(10);
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inputPanel.add(num2Field, gbc);
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gbc.gridy = 2;
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gbc.gridx = 0;
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inputPanel.add(new JLabel("操作符:"), gbc);
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gbc.gridx = 1;
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operatorBox = new JComboBox<>(new String[]{"+", "-", "*", "/", "%"});
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inputPanel.add(operatorBox, gbc);
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gbc.gridy = 3;
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gbc.gridx = 0;
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inputPanel.add(new JLabel("结果:"), gbc);
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gbc.gridx = 1;
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resultField = new JTextField(10);
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resultField.setEditable(false);
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inputPanel.add(resultField, gbc);
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// 创建计算按钮
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JButton calculateButton = new JButton("计算");
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gbc.gridy = 4;
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gbc.gridx = 0;
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gbc.gridwidth = 2;
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gbc.fill = GridBagConstraints.HORIZONTAL;
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inputPanel.add(calculateButton, gbc);
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// 添加事件监听器
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calculateButton.addActionListener(this);
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// 设置面板背景色
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inputPanel.setBackground(Color.LIGHT_GRAY);
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// 将面板添加到窗口
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add(inputPanel, BorderLayout.CENTER);
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// 设置窗口属性
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setSize(400, 300);
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setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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setLocationRelativeTo(null); // 窗口居中显示
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setVisible(true);
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}
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@Override
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public void actionPerformed(ActionEvent e) {
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try {
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double num1 = Double.parseDouble(num1Field.getText());
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double num2 = Double.parseDouble(num2Field.getText());
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String operator = (String) operatorBox.getSelectedItem();
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double result;
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switch (operator) {
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case "+":
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result = num1 + num2;
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break;
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case "-":
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result = num1 - num2;
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break;
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case "*":
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result = num1 * num2;
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break;
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case "/":
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if (num2 != 0) {
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result = num1 / num2;
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} else {
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JOptionPane.showMessageDialog(this, "错误：除数不能为零");
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return;
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}
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break;
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case "%":
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if (num2 != 0) {
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result = num1 % num2;
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} else {
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JOptionPane.showMessageDialog(this, "错误：除数不能为零");
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return;
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}
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break;
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default:
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JOptionPane.showMessageDialog(this, "无效的操作符!");
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return;
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}
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resultField.setText(String.format("%.2f", result));
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} catch (NumberFormatException ex) {
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JOptionPane.showMessageDialog(this, "请输入有效的数字");
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}
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}
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public static void main(String[] args) {
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new Calculator();
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}
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}
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