JPanel & JFrame Output Problem....... Can any one help?

[mahedi]

I don't find any compile error of this program ........

But shows this runtime message........

"Exception in thread "main" java.lang.NullPointerException
at CustomerNew.<init>(CustomerNew.java:34)
at CustomerNew.main(CustomerNew.java:25)"

import javax.swing.*;
public class CustomerNew
{
// Variable for the Frame Window
static JFrame frameObject;
static JPanel panelObject;


// Variable for Label
JLabel labelCustName;
JLabel labelCustCellNo;
JLabel labelCustPackage;
JLabel labelCustAge;

// Variables for data entry control
JTextField textCustName;
JTextField textCustCellNo;
JComboBox comboCustPackage;
JTextField textCustAge;



public static void main(String args[])
{
CustomerNew customerObject=new CustomerNew();
}

public CustomerNew()
{
// Add the appropriate controls to the frame in the constructor
// Create a panel
panelObject=new JPanel();

frameObject.getContentPane().add(panelObject);

//Setting close option

frameObject.setDefaultCloseOperation(JFrame.EXIT_O N_CLOSE);
//Create and the appropriate controls
frameObject.setVisible(true);
frameObject.setSize(600,600);
//Initializing label
labelCustName=new JLabel("Customer Name : ");
labelCustCellNo=new JLabel("Cell Number : ");
labelCustName=new JLabel("Pckgege : ");
labelCustName=new JLabel("Age : ");

//Initializing data entry Control
textCustName=new JTextField(30);
textCustCellNo=new JTextField(15);
textCustAge=new JTextField(2);
String packages[]={"Executive","Standard"};
comboCustPackage=new JComboBox(packages);

//Adding controls controls for Customer Name
panelObject.add(labelCustName);
panelObject.add(textCustName);

//Adding controls controls for Cell Number
panelObject.add(labelCustCellNo);
panelObject.add(textCustCellNo);

//Adding Controls for package
panelObject.add(labelCustPackage);
panelObject.add(comboCustPackage);

//Adding controls for customer Age
panelObject.add(labelCustAge);
panelObject.add(textCustAge);

}
}



It really helpful for me..............

Waiting for response. from expert........

[baloda]

replace

static JFrame frameObject;

with

static JFrame frameObject = new JFrame();

you have intli. one thing many times

labelCustName=new JLabel("Customer Name : "); <<<<<<<
labelCustCellNo=new JLabel("Cell Number : ");
labelCustName=new JLabel("Pckgege : ");<<<<<<<<<
labelCustName=new JLabel("Age : ");<<<<<<<

correct this one.

good luck!!!

[Fubarable]

Why do you have static variables anyway? Shouldn't they be instance fields?