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Thread: Can't Figure out Why I am Getting Null Pointer Exception

  1. #1
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    Unhappy Can't Figure out Why I am Getting Null Pointer Exception

    Hello,
    Following is my Code.

     
    public class ClearTech {
     
     
    	String EmpCode = new String();
    	String EmpName;
    	String Address;
    	String DOB;
     
    	double MonthlySalary;
    	double MontlyTax;
    	double NetSalary;
     
    	byte NoOfDaysinMonth;
    	byte NoOfLeaves;
    	double NetPayableSalary;
     
    	ClearTech()
    	{
    		EmpCode="Init Value";
    		EmpName = "Init Value";
    		Address = "Init Value";
    		DOB = "Init Value";
    	}
     
    	public static void main(String[] args) {
     
    		ClearTech CT = new ClearTech();
    		PerEmployee PE = CT.new PerEmployee();
     
    		PE.Accept();
    		PE.Display();
     
    	}
     
    class PerEmployee
    {
    	int[] AnnualSalary = new int[3];
    	ClearTech[] CT = new ClearTech[3];
     
    	public void Accept()
    	{
     
    	CT[0].EmpCode = "E0001";
    	CT[0].EmpName = "Bob";
    	CT[0].Address = "E-12 Lajpat Nagar";
    	CT[0].DOB = "01/Feb/1974";
    	AnnualSalary[0] = 800000;
     
    	CT[1].EmpCode = "E0002";
    	CT[1].EmpName = "Kevin";
    	CT[1].Address = "E-15 Mandir Marg";
    	CT[1].DOB = "01/Apr/1990";
    	AnnualSalary[1] = 1000000;
     
    	CT[2].EmpCode = "E0003";
    	CT[2].EmpName = "Mohan";
    	CT[2].Address = "E-15 Mandir Marg";
    	CT[2].DOB = "31/July/1984";
    	AnnualSalary[2] = 400000;
     
    	System.out.println("Done with Accept");
     
    	}
     
    	public void Display()
    	{
    		System.out.println("Emp Code\tName\tAddress\t\tDate of Birth\tAnnual Basic Salary");
     
    		for(int i=1;i<4;i++)
    		{
    			System.out.println(CT[i].EmpCode+"\t"+CT[i].EmpName+"\t"+CT[i].Address+"\t"+CT[i].DOB+"\t"+AnnualSalary[i]);
    		}
    	}
     
    }
     
    class TempEmployee
    {
    	int RatePerWorkingDay;
    }
     
    }

    I am not able to figure out Why I am getting a Null pointer exception. I am new to this so please help as soon as possible as the deadline for my submission is 00:00 hours today (11th March 2012). Thanks in advance.


  2. #2
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    Default Re: Can't Figure out Why I am Getting Null Pointer Exception

    Quote Originally Posted by seizitp View Post
    I am not able to figure out Why I am getting a Null pointer exception.
    Post the full stack trace of your NullPointerException and mark the place in your code where it's thrown with something like
     myExistingCode(anObjectIMade); // <-- NPE thrown here

  3. #3
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    Default Re: Can't Figure out Why I am Getting Null Pointer Exception

    Hello seizitp!
    I think that your array (CT) needs to be initialised instead of just being declared(ClearTech[] CT = new ClearTech[3];) before you can assign it values. You can accomplish that by adding a for loop which initialises CT in your Accept() method. And something more; you should check again the indexes here
    for(int i=1;i<4;i++)
    		{
    			System.out.println(CT[i].EmpCode+"\t"+CT[i].EmpName+"\t"+CT[i].Address+"\t"+CT[i].DOB+"\t"+AnnualSalary[i]);
    		}
    otherwise you 'll face another exeption.

  4. The Following User Says Thank You to andreas90 For This Useful Post:

    seizitp (March 11th, 2012)

  5. #4
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    Default Re: Can't Figure out Why I am Getting Null Pointer Exception

    Quote Originally Posted by andreas90 View Post
    Hello seizitp!
    I think that your array (CT) needs to be initialised instead of just being declared(ClearTech[] CT = new ClearTech[3];) before you can assign it values. You can accomplish that by adding a for loop which initialises CT in your Accept() method. And something more; you should check again the indexes here
    for(int i=1;i<4;i++)
    		{
    			System.out.println(CT[i].EmpCode+"\t"+CT[i].EmpName+"\t"+CT[i].Address+"\t"+CT[i].DOB+"\t"+AnnualSalary[i]);
    		}
    otherwise you 'll face another exeption.

    Hello Andreas90,

    Thanks for the correction in the java code. I got it corrected. But my problem still persists. I declared a Constructor for the Parent class (ClearTech) in this case. But still getting the same error. Array of objects is really confusing me. I would really appreciate if you show me an example as of how to Initialize the Array of objects before they could be used.

    Thanks in advance.

  6. #5
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    Default Re: Can't Figure out Why I am Getting Null Pointer Exception

    There are plenty of initialising arrays examples in the Internet. Google is always your best friend.
              public void initialiseArray {
                 Empoloyee[] employee = new Employee[5];
                 for(int i = 0; i < employee.length; i++) {
                    employee[i] = new Employee();
                 }
              }

  7. The Following User Says Thank You to andreas90 For This Useful Post:

    seizitp (March 11th, 2012)

  8. #6
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    Default Re: Can't Figure out Why I am Getting Null Pointer Exception

    Thanks andreas90
    Just before you posted the solution I figured it out..
    Yes! Google was a real help
    I think it's best to quote ' After a Dog, Google is Man's best friend '
    Last edited by seizitp; March 11th, 2012 at 10:33 AM.

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