Cek Koneksi Java

import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import java.awt.Color;
import javax.swing.JLabel;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.net.URL;
import java.net.URLConnection;

@SuppressWarnings("serial")
public class FrmCekKoneksi extends JFrame {

    private JPanel contentPane;
    private JLabel lblTerminalLinux;
    private JButton btnCek;
    private JLabel lblKet;

    /**
     * Create the frame.
     */
    public FrmCekKoneksi() {
        setResizable(false);
        setTitle("Cek Koneksi Internet");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBackground(Color.BLACK);
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);

        lblTerminalLinux = new JLabel("Terminal - Linux : cek_koneksi_internet");
        lblTerminalLinux.setForeground(Color.WHITE);
        lblTerminalLinux.setBounds(12, 12, 281, 14);
        contentPane.add(lblTerminalLinux);

        btnCek = new JButton("Cek ");
        btnCek.setFocusable(false);
        btnCek.setFocusPainted(false);
        btnCek.setForeground(Color.WHITE);
        btnCek.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                @SuppressWarnings("unused")
                boolean konek;
                try {
                    URL url = new URL("http://google.co.id");
                    URLConnection conn = url.openConnection();
                    conn.connect();
                    konek = true;
                    lblKet.setText("Koneksi Internet Sukses");
                } catch (Exception e) {
                    konek = false;
                    lblKet.setText("Koneksi Internet Gagal");
                }
            }
        });
        btnCek.setBackground(Color.BLUE);
        btnCek.setBounds(163, 228, 106, 24);
        contentPane.add(btnCek);

        lblKet = new JLabel("");
        lblKet.setForeground(Color.WHITE);
        lblKet.setBounds(128, 44, 223, 14);
        contentPane.add(lblKet);
        setLocationRelativeTo(null);
    }

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    FrmCekKoneksi frame = new FrmCekKoneksi();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }
}