使用NetBeans创建Java GUI应用程序

该示例代码演示了如何使用NetBeans IDE创建Java图形用户界面(GUI)应用程序。NetBeans提供了一个方便的可视化界面设计器并生成对应的Java代码。这使得创建复杂的GUI应用程序变得容易。本示例代码创建了一个简单的登录GUI应用程序。

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.*;

public class LoginForm extends JFrame implements ActionListener {
    JPanel panel;
    JLabel userLabel, passwordLabel, messageLabel;
    JTextField usernameField, passwordField;
    JButton loginButton, resetButton;

    LoginForm() {
        userLabel = new JLabel("用户名：");
        userLabel.setBounds(50, 50, 80, 30);
        usernameField = new JTextField();
        usernameField.setBounds(150, 50, 150, 30);

        passwordLabel = new JLabel("密码：");
        passwordLabel.setBounds(50, 100, 80, 30);
        passwordField = new JTextField();
        passwordField.setBounds(150, 100, 150, 30);

        loginButton = new JButton("登录");
        loginButton.setBounds(50, 150, 80, 30);
        loginButton.addActionListener(this);

        resetButton = new JButton("重置");
        resetButton.setBounds(200, 150, 80, 30);
        resetButton.addActionListener(this);

        messageLabel = new JLabel();
        messageLabel.setBounds(50, 200, 250, 30);

        panel = new JPanel();
        panel.setLayout(null);
        panel.add(userLabel);
        panel.add(usernameField);
        panel.add(passwordLabel);
        panel.add(passwordField);
        panel.add(loginButton);
        panel.add(resetButton);
        panel.add(messageLabel);

        setTitle("登录表单");
        add(panel);
        setSize(400, 300);
        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == loginButton) {
            String username = usernameField.getText();
            String password = passwordField.getText();
            if (username.trim().equals("admin") && password.trim().equals("123")) {
                messageLabel.setText("登录成功！");
            } else {
                messageLabel.setText("用户名或密码错误！");
            }
        } else if (e.getSource() == resetButton) {
            usernameField.setText("");
            passwordField.setText("");
            messageLabel.setText("");
        }
    }

    public static void main(String[] args) {
        LoginForm loginForm = new LoginForm();
    }
}

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