Menampilkan Database di Tabel menggunakan Netbeans

Langsung aja bro..

package TB;

import java.sql.*;
import java.sql.DriverManager;
import javax.swing.JOptionPane;
import javax.swing.table.DefaultTableModel;

public class formDatabase extends javax.swing.JFrame {
public Connection conn;
public Statement st;
public ResultSet rs;
    /** Creates new form formDatabase */
    public formDatabase() {
        initComponents();
        koneksi();
        tampilkandata();
        setLocationRelativeTo(this);
    }

public void koneksi(){
try{
        Class.forName("com.mysql.jdbc.Driver");
        conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/tokokelontong","root","");
        st = conn.createStatement();
    }catch (Exception e){
       
        JOptionPane.showMessageDialog(null,"koneksi gagal..");
        System.out.println(e.getMessage());  
    }
if (conn != null)
System.out.println("Berhasil Koneksi");
else
System.out.println("Gagal Koneksi");    
}  

 public void tampilkandata() {
        DefaultTableModel tabeltrans = new DefaultTableModel();
        tabeltrans.addColumn("Nomor Transaksi");
        tabeltrans.addColumn("Petugas");
        tabeltrans.addColumn("Tanggal");
        tabeltrans.addColumn("Kode Barang");
        tabeltrans.addColumn("Nama Barang");
        tabeltrans.addColumn("Harga");
        tabeltrans.addColumn("Qty");
        tabeltrans.addColumn("Total");
        tabeltrans.addColumn("Subtotal");
        tabeltrans.addColumn("Bayar");
        tabeltrans.addColumn("Kembali");
        try {
            koneksi();
            String sql = "select * from transaksi";
            Statement stat = conn.createStatement();
            ResultSet res=stat.executeQuery(sql);
            while (res.next()) {
                tabeltrans.addRow(new Object[]{res.getString(1),res.getString(2),res.getString(3),res.getString(4),
                    res.getString(5),res.getString(6),res.getString(7),res.getString(8),res.getString(9),
                res.getString(10),res.getString(11)});
            }
           jTable1.setModel(tabeltrans);
        } catch (Exception e) {
        }

    }

private void btnTutupActionPerformed(java.awt.event.ActionEvent evt) {                                        
// TODO add your handling code here:
    new Transaksi().setVisible(true);
    this.dispose();
}                      

Hasil :