Fungsi

private void kosong(){
        txtalamat.setText(null);
        txtnama.setText(null);
        txtnim.setText(null);
        txttelp.setText(null);
        jComboBox1.setSelectedItem(this);
    }
    private void load_table(){

        // membuat tampilan model tabel
        DefaultTableModel model = new DefaultTableModel();


        model.addColumn("No");
        model.addColumn("Nama");
        model.addColumn("NIM");
        model.addColumn("Jurusan");
        model.addColumn("Alamat");
        model.addColumn("Telp");

        //menampilkan data database kedalam tabel
        try {
            int no=1;
            String sql = "select * from mhs";
            java.sql.Connection conn=(Connection)Config.configDB();
            java.sql.Statement stm=conn.createStatement();
            java.sql.ResultSet res=stm.executeQuery(sql);
            while(res.next()){
                model.addRow(new Object[]{no++,res.getString(1),res.getString(2),res.getString(3),res.getString(4),res.getString(5)});
            }
            jTable1.setModel(model);
        } catch (Exception e) {
        }

    }