取得電腦的網路位置

package getaddress2;

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

public class GetAddress2 extends JFrame {

    private JLabel lb1,lb2;
    private JTextField tf1,tf2;
    
    public static void main(String[] args) {
        GetAddress2 sm= new GetAddress2();
        
    }
    public GetAddress2()
    {
        super("範例");
        try{
            InetAddress ia = InetAddress.getLocalHost();
            
            lb1 = new JLabel("主機名稱");
            lb2 = new JLabel("IP位址");
            tf1 = new JTextField(ia.getHostName());
            tf2 = new JTextField(ia.getHostAddress());
            
            setLayout(new GridLayout(2,2));
            
            add(lb1);
            add(tf1);
            add(lb2);
            add(tf2);
            
            addWindowListener(new SampleWindowListener());
        pack();
            
        setVisible(true);
        }
        catch(Exception e){
            e.printStackTrace();
        }
    }

   
    
    class SampleWindowListener extends WindowAdapter
    {
        public void windowClosing(WindowEvent e)
        {
            System.exit(0);
        }
    }

   
    
    
}