Swing对话框的问题，求教各位！

Question

从JDialog继承一个类出来，添加用户输入的控件，添加事件响应就好了。

Answer 1

我做的登陆窗口
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.JTextComponent;public class LoginUI extends JDialog
{    JTextField userFiled;
    JPasswordField passwordFiled;
    Container c;    public LoginUI()
    {
        userFiled = null;
        passwordFiled = null;
        c = null;
        String title = "System Login";
        JFrame f = new JFrame();
        new LoginUI(f, title);
    }    public LoginUI(JFrame f, String title)
    {
        super(f, title, true);
        userFiled = null;
        passwordFiled = null;
        c = null;
        setSize(400, 160);
        setResizable(false);
        Dimension ds = Toolkit.getDefaultToolkit().getScreenSize();
        setLocation(ds.width / 3, ds.height / 4);
        c = getContentPane();
        c.setLayout(new FlowLayout(0));
        addWindowListener(new WindowAdapter() {            public void windowClosing(WindowEvent ew)
            {
                System.exit(0);
            }        });
        JPanel p = new JPanel();
        p.setLayout(new GridLayout(2, 1));
        JLabel label1 = new JLabel(new ImageIcon("Key.gif"));
        p.add(label1);
        JPanel p1 = new JPanel();
        p1.setLayout(new GridLayout(5, 1));
        JPanel p2 = new JPanel();
        p2.setLayout(new GridLayout(4, 1));
        JButton okButton = new JButton("OK");
        ActionListener okAction = new ActionListener() {            public void actionPerformed(ActionEvent ea)
            {
                System.exit(0);
            }        };
        JButton cancelButton = new JButton("Cancel");
        ActionListener cancelAction = new ActionListener() {            public void actionPerformed(ActionEvent ea)
            {
                System.exit(0);
            }        };
        cancelButton.addActionListener(cancelAction);
        p2.add(okButton);
        p2.add(cancelButton);
        JLabel label = new JLabel("\u8BF7\u60A8\u8F93\u5165\u6709\u6548\u7684\u7CFB\u7EDF\u767B\u9646\u53E3\u4EE4\u3002");
        JPanel p3 = new JPanel();
        p3.setLayout(new FlowLayout(0));
        JLabel passwordName = new JLabel("\u53E3\u4EE4:");
        JPanel p4 = new JPanel();
        p4.setLayout(new FlowLayout(0));
        JLabel userName = new JLabel("\u7528\u6237:");
        userFiled = new JTextField(16);
        passwordFiled = new JPasswordField(16);
        ActionListener ok_Action = new ActionListener() {            public void actionPerformed(ActionEvent ea)
            {
                String user_str = userFiled.getText();
                String password_str = passwordFiled.getText();
                if(user_str.trim() == null || user_str.equals(""))
                {
                    JOptionPane.showMessageDialog(c, "\u7528\u6237\u540D\u4E0D\u80FD\u4E3A\u7A7A!", "System Message!", 0);
                    return;
                }
                if(password_str.trim() == null || password_str.equals(""))
                {
                    JOptionPane.showMessageDialog(c, "\u5BC6\u7801\u4E0D\u80FD\u4E3A\u7A7A!", "System Message!", 0);
                    return;
                }
                if(!user_str.trim().equals("yanglongfei"))
                {
                    JOptionPane.showMessageDialog(c, "\u7528\u6237\u540D\u9519\u8BEF!", "System Message!", 0);
                    return;
                }
                if(!password_str.trim().equals("yanglongfei"))
                {
                    JOptionPane.showMessageDialog(c, "\u5BC6\u7801\u9519\u8BEF!", "System Message!", 0);
                    return;
                } else
                {
                    setVisible(false);
                    dispose();
                    return;
                }
            }        };
        okButton.addActionListener(ok_Action);
        p3.add(userName);
        p3.add(userFiled);
        p4.add(passwordName);
        p4.add(passwordFiled);
        p1.add(label);
        p1.add(p3);
        p1.add(p4);
        c.add(p);
        c.add(p1);
        c.add(p2);
        setVisible(true);
    }
}