HELP!!Store into Array

[huiling25]

import java.io.*;
import java.util.*;

public class Test
{
	private static String[] pdtNoArray=null;
	private static String smiles=null;
	
	public static void main (String[] args)
	{
		try
		{
	Scanner inFile = new Scanner(new FileReader("/home/huiling/lopac_smiles.txt"));
			
			for(int i=0;i<5;i++)
			{
				smiles = inFile.next();
				pdtNoArray[i] = inFile.next();
			System.out.println(pdtNoArray);
					
			}
		}
		catch (FileNotFoundException fe)
		{
			System.out.println(fe.toString());
		}
	}	
}

I don't know why my program keeps on giving me a NullPointer exception. The main purpose of this program is to take the data(pdtNo) from a file and store into an array.

[r035198x]

import java.io.*;
import java.util.*;
 
public class Test
{
	private static String[] pdtNoArray=null;
	private static String smiles=null;
 
	public static void main (String[] args)
	{
		try
		{
	Scanner inFile = new Scanner(new FileReader("/home/huiling/lopac_smiles.txt"));
 
			for(int i=0;i<5;i++)
			{
				smiles = inFile.next();
				pdtNoArray[i] = inFile.next();
			System.out.println(pdtNoArray);
 
			}
		}
		catch (FileNotFoundException fe)
		{
			System.out.println(fe.toString());
		}
	}	
}

I don't know why my program keeps on giving me a NullPointer exception. The main purpose of this program is to take the data(pdtNo) from a file and store into an array.

For starters you have

private static String[] pdtNoArray=null;

and then never in your code did you initialise the array pdtNoArray

[huiling25]

For starters you have

private static String[] pdtNoArray=null;

and then never in your code did you initialise the array pdtNoArray

How can I initialise pdtNoArray? Is it like this:

private static String[] pdtNoArray={null};

[r035198x]

How can I initialise pdtNoArray? Is it like this:

private static String[] pdtNoArray={null};

You need to know the size of the the array first.

e.g

private static String[] pdtNoArray= new String[10];

[huiling25]

You need to know the size of the the array first.

e.g

private static String[] pdtNoArray= new String[10];

Thanx for ur help, I solve the problem already. Can i ask u how can I initialise my float array?Is it like this (This will be my last question):

	private static float[] tanimoto_coefficient={0.0f};

[r035198x]

Thanx for ur help, I solve the problem already. Can i ask u how can I initialise my float array?Is it like this (This will be my last question):

	private static float[] tanimoto_coefficient={0.0f};

No. Same way you did with the String array. Just specify the size. Since your array is static all the values are immediately initialised to 0.0f.

 
private static float[] tanimoto_coefficient= new float[10]; // for size 10 array

[huiling25]

No. Same way you did with the String array. Just specify the size. Since your array is static all the values are immediately initialised to 0.0f.

 
private static float[] tanimoto_coefficient= new float[10]; // for size 10 array

Ok, thanks alot~