具体程序代码

以下是一个简单的Java事件处理ATM柜员机模拟程序的示例代码，您可以参考一下：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class ATM implements ActionListener {
    
    private JFrame frame;
    private JPanel panel;
    private JLabel cardLabel, pinLabel;
    private JTextField cardField, pinField;
    private JButton enterButton;
    private JButton withdrawButton, depositButton, balanceButton, exitButton;
    private JLabel messageLabel;
    private double balance = 0;
    
    public ATM() {
        // 创建窗口和面板
        frame = new JFrame("ATM");
        panel = new JPanel(new GridLayout(5, 2));
        
        // 添加卡号和密码输入框
        cardLabel = new JLabel("Card Number:");
        panel.add(cardLabel);
        cardField = new JTextField(20);
        panel.add(cardField);
        pinLabel = new JLabel("PIN:");
        panel.add(pinLabel);
        pinField = new JTextField(20);
        panel.add(pinField);
        
        // 添加登录按钮
        enterButton = new JButton("Enter");
        enterButton.addActionListener(this);
        panel.add(enterButton);
        
        // 添加操作按钮
        withdrawButton = new JButton("Withdraw");
        withdrawButton.addActionListener(this);
        depositButton = new JButton("Deposit");
        depositButton.addActionListener(this);
        balanceButton = new JButton("Balance");
        balanceButton.addActionListener(this);
        exitButton = new JButton("Exit");
        exitButton.addActionListener(this);
        
        // 添加提示信息标签
        messageLabel = new JLabel("");
        
        // 将操作按钮和提示信息标签添加到面板中，但不显示
        panel.add(withdrawButton);
        panel.add(depositButton);
        panel.add(balanceButton);
        panel.add(exitButton);
        panel.add(messageLabel);
        withdrawButton.setVisible(false);
        depositButton.setVisible(false);
        balanceButton.setVisible(false);
        exitButton.setVisible(false);
        messageLabel.setVisible(false);
        
        // 将面板添加到窗口中，并设置窗口大小
        frame.getContentPane().add(panel);
        frame.setSize(300, 200);
        frame.setVisible(true);
    }
    
    public void actionPerformed(ActionEvent e) {
        String cardNumber = cardField.getText();
        String pin = pinField.getText();
        
        if (e.getSource() == enterButton) {
            // 验证卡号和密码是否正确
            if (cardNumber.equals("123456") && pin.equals("1234")) {
                messageLabel.setText("Login successful!");
                withdrawButton.setVisible(true);
                depositButton.setVisible(true);
                balanceButton.setVisible(true);
                exitButton.setVisible(true);
                messageLabel.setVisible(true);
            } else {
                messageLabel.setText("Invalid card number or PIN!");
                messageLabel.setVisible(true);
            }
        } else if (e.getSource() == withdrawButton) {
            // 执行取款操作
            String amountString = JOptionPane.showInputDialog("Enter amount:");
            if (amountString != null && !amountString.equals("")) {
                double amount = Double.parseDouble(amountString);
                if (amount > balance) {
                    messageLabel.setText("Insufficient balance!");
                    messageLabel.setVisible(true);
                } else {
                    balance -= amount;
                    messageLabel.setText("Withdraw successfully! Balance: " + balance);
                    messageLabel.setVisible(true);
                }
            }
        } else if (e.getSource() == depositButton) {
            // 执行存款操作
            String amountString = JOptionPane.showInputDialog("Enter amount:");
            if (amountString != null && !amountString.equals("")) {
                double amount = Double.parseDouble(amountString);
                balance += amount;
                messageLabel.setText("Deposit successfully! Balance: " + balance);
                messageLabel.setVisible(true);
            }
        } else if (e.getSource() == balanceButton) {
            // 执行查询余额操作
            messageLabel.setText("Your balance is: " + balance);
            messageLabel.setVisible(true);
        } else if (e.getSource() == exitButton) {
            // 执行退出操作
            System.exit(0);
        }
    }
    
    public static void main(String[] args) {
        new ATM();
    }
}

以上是一个简单的Java事件处理ATM柜员机模拟程序的示例代码，其中利用了Swing库的一些组件来实现界面的显示和事件的处理。程序运行后，会显示一个登录界面，用户输入卡号和密码后点击“Enter”按钮进行登录。登录成功后，会显示主菜单，包括取款、存款、查询余额和退出等选项。用户选择某个选项后，程序会触发相应的事件处理器，执行相应的操作。