[hardwired]

Code:

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

class PTRP extends JPanel {
//    private JLabel rno,vno;
    private JTextField txtRNo,txtVNo;
//    private JLabel lblPtName,lblConsultBy;
    private JButton btnOk;
    private JTextField txtPtName,txtConsultBy;
    private JTable gridPreview;

    PTRP() {
        addComponents();
    }
	
    private void addComponents() {
        GridBagLayout gb=new GridBagLayout();
        GridBagConstraints gbc=new GridBagConstraints();
        gbc.insets = new Insets(0,0,0,0);
        gbc.weightx = 1.0;
        gbc.weighty = 1.0;
        setLayout(gb);

        //ADD First Row
        //Adding 1st & 2nd Col...
        JPanel row1 = new JPanel(gb);
        gbc.insets = new Insets(2,2,2,2);
        gbc.anchor=GridBagConstraints.WEST;
        JLabel rno=new JLabel("Test Recpt. No.:");
        row1.add(rno, gbc);
        txtRNo=new JTextField(8);
//        txtRNo.setSize(40,rno.getHeight());
        txtRNo.setEditable(false);
        row1.add(txtRNo, gbc);		
        //Adding 3rd Col...
//        gbc.fill=GridBagConstraints.HORIZONTAL;
//        gbc.gridwidth=GridBagConstraints.REMAINDER;
//        JPanel pnlTemp=new JPanel(new FlowLayout(FlowLayout.RIGHT));
        JLabel vno=new JLabel("Voucher No.:");
        txtVNo=new JTextField(8);
//        txtVNo.setSize(40,vno.getHeight());
        txtVNo.setEditable(false);
        row1.add(vno, gbc);
        row1.add(txtVNo, gbc);
        gbc.insets = new Insets(0,0,0,0);
        gbc.gridwidth=2;
        gbc.fill=GridBagConstraints.HORIZONTAL;
        add(row1, gbc);
        gbc.fill=GridBagConstraints.NONE;
        gbc.gridy = 1;

        //ADD Second Row
        //Adding 1st Col...
        gbc.gridwidth=1;
        gbc.weightx = 0;
        JLabel lblPtName=new JLabel("Pt. Name");
        txtPtName=new JTextField();
        add(lblPtName, gbc);
        //Addding 2nd Col...
//        gbc.gridy = GridBagConstraints.RELATIVE;
        gbc.weightx = 1.0;
        gbc.fill=GridBagConstraints.HORIZONTAL;
//        gbc.gridwidth=GridBagConstraints.REMAINDER;
        add(txtPtName, gbc);
        gbc.fill=GridBagConstraints.NONE;
        gbc.gridy++;

        //ADD Third Row
        //Adding 1st Col...
//        gbc.gridwidth=1;
        gbc.weightx = 0;
        lblPtName=new JLabel("Consult By");
        txtPtName=new JTextField();
        add(lblPtName, gbc);
        //Addding 2nd Col...
//        gbc.gridwidth=GridBagConstraints.REMAINDER;
        gbc.weightx = 1.0;
        gbc.fill=GridBagConstraints.HORIZONTAL;
        add(txtPtName, gbc);
        gbc.fill=GridBagConstraints.NONE;
        gbc.gridy++;

        //ADD Fourth Row
//        gbc.fill=GridBagConstraints.BOTH;
        gbc.gridwidth = 2;
        gridPreview=new JTable(2,2);
        Dimension d = gridPreview.getPreferredSize();
        System.out.printf("d = [%d, %d]%n", d.width, d.height);
        d.width = 300;
        gridPreview.setPreferredScrollableViewportSize(d);
        gbc.anchor=GridBagConstraints.CENTER;
        gbc.fill=GridBagConstraints.HORIZONTAL;
        add(new JScrollPane(gridPreview), gbc);

        //Add Fifth Row
        gbc.fill=GridBagConstraints.NONE;
        gbc.anchor=GridBagConstraints.EAST;
        gbc.gridy++;
        btnOk=new JButton("OK");
        btnOk.setMnemonic('O');
        add(btnOk,gbc);
        btnOk.requestFocusInWindow();
    }

    private static void showPanel() {
        final JFrame jf=new JFrame("GridBag Test");
        PTRP pnlGridBag=new PTRP();
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jf.setContentPane(pnlGridBag);
//        jf.setPreferredSize(new Dimension(300,250));
        jf.setLocationByPlatform(true);
        jf.pack();
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                jf.setVisible(true);
            }
        });
        Dimension d = pnlGridBag.getPreferredSize();
        Dimension s = pnlGridBag.getSize();
        System.out.printf("pnlGridBag d = [%d, %d]  s = [%d, %d]%n",
                           d.width, d.height, s.width, s.height);
    }

    public static void main (String[] args) {
        showPanel();
    }
}