Store integer from a file into an ArrayList

[ISAIAH]

Hello,
I am beginner in Java, my work is to extract data from a text-only files file this form:
0 1 1 1 0 0 0
1 0 1 0 1 0 1
etc.....
I store each line of the file in a ArrayList
Here is my code.

for(int i =0; i <= NUMBER_OF_LINES; i + +){
ArrayList <Integer> v = new ArrayList <Integer>();
ln = br.readLine();
ln = ln.trim();
StringTokenizer st = new StringTokenizer(row," ");
while(st.hasMoreTokens()) 
{
  v.add(Integer.parseInt(st.nextToken()));
  System.out.System.out.println(v);
}

This code takes me back the following exception:

java.lang.NullPointerException

Does someone can help me? I want to know if I'm on the right track.

[Miles Runner]

Hello,
I had a similar kind of a problem in my code. I noticed that the fault is that the loop "for (int i = 0; i <= NUMBER_OF_LINES; i + +)" NUMBER_OF_LINES performs iterations 1 and that is why it brings exception, one just want to know how I could manipulate the contents of ArrayListe. The file handle contains NUMBER_OF_LINES I 0 1 0 0 1 0 and the width of each line that I recover these two parameters to the first and second line of the file, I am now to what remains of file that is the result of the 0 1 0 1 etc.. I want to extract all the 1 in a structure knowing that the file contains. Here is the code which I was trying to do.

Public class pretreatment {
 
	Public static void hand(String[] args) throws NumberFormatException {
		try{
			InputStream in = new FileInputStream("c: / / some file");
InputStreamReader insr = new InputStreamReader(in);
BufferedReader br = new BufferedReader(insr);
String str1 = br.readLine();
str1 = str1.trim();
			int NUMBER_OF_LINES = Integer.parseInt(str1);
System.out.System.out.println(NUMBER_OF_LINES);
String str2 = br.readLine();
str2 = str2.trim();
			int nb_colonne = Integer.parseInt(str2);
System.out.System.out.println(nb_colonne);
String ln =null;
			
			for(int i =0; i <NUMBER_OF_LINES; i + +){
				ArrayList <Integer> var = new ArrayList <Integer>();
ln = br.readLine();
ln = ln.trim();
				int j =0;
StringTokenizer val = new StringTokenizer(row," ");
				int n =0;
				while(val.hasMoreTokens()){ 
				var.add(Integer.parseInt(val.nextToken()));
				}
				j + +;
System.out.System.out.println(nbr);
				}
			br.close(); 
		} 	catch (Exception e){ 
			System.out.System.out.println(e.function toString() {
    [native code]
}()); 
			} 
 	}
}

[Linux-Us]

Hello,
I have a part of code with me, if you need you can check it out.

	[...]		 
        ln = ln.trim();
 
        / / Hello, I tend to do more basic:
        String[] lnParts = ln.split(" ");
        
	for (int k = 0K <lnParts.lengthK + +) 
	{
	   var.add(new Integer(lnParts[k]));
	}  
		
	[...]

Try this and if you have any problem then do post back.

[ISAIAH]

Hello,
Thank you for reply, I think it's better that is I want to store indices related to "1" in a structure.Comment can we declare a two dimensional ArrayList? Is this possible? If yes how to handle ? Or if you know any alternative method for doing this you can suggest me. Or if someone has an sample code for this then please post back, it will help me a lot. Thanks in advance.

[cyber-noob]

Hello,
I have never tried such an example but still, if you need some help here is my code, thought it may not satisfy your needs. Just have a look at it.

List <List <Integer>> ls2 = new ArrayList <List <Integer>>();

ls2.add(new ArrayList <Integer>());

List sbls = <Integer> ls2.get(0);

Hope this may help you and you write a code which will satisfy your needs.

[Windowed]

Hello,
The following code may help you. If you like it you can use it for your program. Best of Luck

ArrayList <Integer> mdiv = new ArrayList <Integer>();
		
        / / Watch your indentations, alignment without parentheses, the code is hard to read
	/ / NUMBER_OF_LINES in java that makes nombreLignes
	for(int i = 0; I <nombreLignes; i + +)
	{
		/ / This is your "var" but as this was not very speaking ...
		ArrayList <Integer> ldvu = new ArrayList <Integer>();
			
		/ / This is your "br" 
		ln = myBufferedReader.readLine();
ln = ln.trim();
			
		/ / More basic:
		String[] str = ln.split(" ");
		        
		for (int k = 0K <str.lengthK + +) 
		{
			/ / We test if the figure is 1.
			if (new Integer(str[k]).intValue() == 1)					
			{   / / We store the index (and 1). I understood?
			    ldvu.add(new Integer(k));
			}				
		}
		mdiv.add(ldvu);
	}