Help with buttons in gui

Question

I need to create first, last, next, and previous buttons in my gui. I have them in there (in the code), but only one button shows up (instead of four), and it has "first" overlapped with the "previous" button. The "next" and "last" don't even show up at all.
Can some one guide me please? Can someone tell me what I am doing wrong?? Thank you in advance
Here is my maker.java which houses the navigation panel
package inventorymain;
import javax.swing.JFrame;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import java.text.NumberFormat;
import javax.swing.border.*;
import java.net.*;
import java.util.StringTokenizer;
class Maker extends Inventory implements ActionListener
{//begins Class Maker
    static String manufact[] = new String[10];
    static double restockingFee[] = new double[10];
    static int i;
    static double TotalVal;
    static int navItem;
    private Container cp = getContentPane();
    GridBagConstraints c;
    GridBagConstraints cconstraint;
    Border titledborder;
    JPanel pan;
    String labels[] = {"Product Name:", "Manufacturer:", "Product ID Number:", "Units in Stock:", 
                       "Price Per Unit: $", "Restocking Fee: $", "Value of Product in Stock Plus Restocking Fee: $",
                       "Value of All Merchandise Plus Restocking Fees: $"};
    int len1 = labels.length;
    JLabel lbl[] = new JLabel[len1];
    JTextField txtfield1[] = new JTextField[len1];
    String blabels[] = {"First", "Previous", "Next", "Last"};
    int blen = blabels.length;
    JButton navigate[] = new JButton[blen];
    JLabel lblImg;
    File file;
    public String FileName;
    public Maker(int Item_Number, String Item_Name, double Item_Price, int Items_in_Stock, String manufact, double restockingFee)// Constructor for varibles
        super(Item_Number, Item_Name, Item_Price, Items_in_Stock);
        this.manufact[i] = manufact;
        this.restockingFee[i] = restockingFee;
        i = i + 1;
    public static void setManufact(int k, String value)
        manufact[k] = value;
    public static double getRestockFee(int val)
        return restockingFee[val];
    public void ShowInventory()
        setLayout(new FlowLayout());
        GridBagLayout contlayout = new GridBagLayout();//layout for container
        GridBagConstraints cconstraint = new GridBagConstraints();//constraint for container
        GridBagLayout gblayout = new GridBagLayout();//layout for panel
        GridBagConstraints gbconstraint = new GridBagConstraints();
        try
            //first panel
            pan = new JPanel();
            gblayout = new GridBagLayout();
            gbconstraint = new GridBagConstraints();
            pan.setLayout(gblayout);
            for (int i = 0; i < 2; i++)
                for (int j = 0; j < len1; j++)
                    int x = i;
                    int y = j;
                    if (x == 0)
                        lbl[j] = new JLabel(labels[j]);
                        lbl[j].setHorizontalAlignment(JLabel.LEFT);
                        lbl[j].setPreferredSize(new Dimension(250, 15));
                        gbconstraint.insets = new Insets(10, 0, 0, 0);
                        gbconstraint.gridx = x;
                        gbconstraint.gridy = y;
                        pan.add(lbl[j], gbconstraint);
                    }//end if
                    else
                        txtfield1[j] = new JTextField(15);
                        txtfield1[j].setPreferredSize(new Dimension(300, 15));
                        txtfield1[j].setHorizontalAlignment(JLabel.LEFT);
                        txtfield1[j].setEnabled(false);
                        lbl[j].setLabelFor(txtfield1[j]);
                        gbconstraint.gridx = x;
                        gbconstraint.gridy = y;
                        pan.add(txtfield1[j], gbconstraint);                       
                    }//end else
                }//end for
            }//end for
            Border titledborder = BorderFactory.createTitledBorder("Current Inventory Data");
            pan.setBorder(titledborder);
            //adds panel to container
            cconstraint.gridwidth = 1;
            cconstraint.gridheight = 1;
            cconstraint.gridx = 0;
            cconstraint.gridy = 0;
            cp.add(pan, cconstraint);
            //add icon to display
            pan = new JPanel();
            gblayout = new GridBagLayout();
            gbconstraint = new GridBagConstraints();
            pan.setLayout(gblayout);
            gbconstraint.gridwidth = 1;
            gbconstraint.gridheight = 1;
            gbconstraint.gridy = 0;
            lblImg = new JLabel((new ImageIcon(getClass().getResource("logo111.jpg"))));
            lblImg.setPreferredSize(new Dimension(120, 60));
            pan.add(lblImg);
            cconstraint.gridwidth = 1;
            cconstraint.gridheight = 1;
            cconstraint.gridx = 0;
            cconstraint.gridy = 1;
            cp.add(pan, cconstraint);
            //navigation panel
            pan = new JPanel();
            gblayout = new GridBagLayout();
            gbconstraint = new GridBagConstraints();
            pan.setLayout(gblayout);
            gbconstraint.gridwidth = 1;
            gbconstraint.gridheight = 1;
            gbconstraint.gridx = 0;
            gbconstraint.gridy = 1;
            for (int i = 0; i < blen; i++)
                navigate[i] = new JButton(blabels);
gbconstraint.gridx = 1;
pan.add(navigate[i], gbconstraint);
navigate[i].addActionListener(this);
}//end for
titledborder = BorderFactory.createTitledBorder("Navigation");
pan.setBorder(titledborder);
//add panel to container
cconstraint.gridwidth = 4;
cconstraint.gridheight = 1;
cconstraint.gridx = 1;
cconstraint.gridy = 1;
cp.add(pan, cconstraint);
ShowInventory(0);
}//end try
catch (Exception e)
e.printStackTrace();
}//end catch
}//end showInventory
public void ShowInventory(int ItemNo)
txtfield1[0].setText(Integer.toString(ItemNo));
txtfield1[0].setText(Inventory.getItemName(ItemNo));
txtfield1[1].setText(manufact[ItemNo]);
txtfield1[2].setText(Integer.toString(Inventory.getItemNum(ItemNo)));
txtfield1[3].setText(Integer.toString(Inventory.getItemUnits(ItemNo)));
txtfield1[4].setText(Double.toString(Inventory.getItemPrice(ItemNo)));
txtfield1[5].setText(String.format("%3.2f",
Products.totalOfRestockFee(Inventory.getItemPrice(ItemNo),
getRestockFee(ItemNo))));
txtfield1[6].setText(String.format("%3.2f",
Products.totalOfInventory(Inventory.getItemPrice(ItemNo),
Inventory.getItemUnits(ItemNo), getRestockFee(ItemNo))));
txtfield1[7].setText(String.format("%3.2f",
GetTotalInvVal()));
}//end ShowInventory(int ItemNo)
public void EnableFields(boolean bflag)
txtfield1[1].setEnabled(bflag);
txtfield1[2].setEnabled(bflag);
txtfield1[3].setEnabled(bflag);
txtfield1[4].setEnabled(bflag);
txtfield1[5].setEnabled(bflag);
}//end EnableFields
public double GetTotalInvVal()
TotalVal = 0;
for(int j = 0; j < Inventory.getCount(); j++)
TotalVal += Products.totalOfInventory(Inventory.getItemPrice(j),
Inventory.getItemUnits(j), getRestockFee(j));
return TotalVal;
}//end GetTotalInvVal
public void actionPerformed(ActionEvent e)//button actions
String btnClicked = ((JButton)e.getSource()).getText();
if (btnClicked.equals("First"))
EnableFields(false);
navItem = 0;
ShowInventory(navItem);
}//end if
if (btnClicked.equals("Next"))
EnableFields(false);
if (navItem == getCount() - 1)
navItem = 0;
}//end if
else
navItem += 1;
}//end else
ShowInventory(navItem);
}//end if
if (btnClicked.equals("Previous"))
EnableFields(false);
if (navItem == 0)
navItem = getCount() - 1;
}//end if
else
navItem = navItem - 1;
}//end else
ShowInventory(navItem);
}//end if
if (btnClicked.equals("Last"))
EnableFields(false);
navItem = getCount() - 1;
ShowInventory(navItem);
}//end if
}//end ActionPerformed
}// end of class Maker

Answer 1

for (int i = 0; i < blen; i++)
         navigate[i] = new JButton(blabels);
gbconstraint.gridx = 1; // ---- > You mean for this be = i, No?
     // Somehow you need to be resetting the grid x for each button added     
pan.add(navigate[i], gbconstraint);
navigate[i].addActionListener(this);
}//end for
Or check out gridx = GridBagConstraints.RELATIVE
Message was edited by:
nantucket