Can someone please help Me?!

[The Dark Dragon]

If I had a pattern of 0's and 1's like this for example:

0000000000000000000000000
0000000000000000000000000
0000000000000000000000000
0000011000000000000000000
0000101000111000000000000
0000101001000100000000000
0000101000101000000000000
0000100111000111100000000
0000011100000000010000000
0000000010000000010000000
0000000010000011010000000
0000000010000011010000000
0000000010000011010000000
0000000010000011010000000
0000000010001001100000000
0000000010010100100000000
0000000010010100100000000
0000000100010100100000000
0000000100100010010000000
0000000100100010010000000
0000000100100010010000000
0000111001000001001100000
0000111110000001111100000
0000000000000000000000000
0000000000000000000000000

How could I do it in java programming so that the 1's were a coloured dot and the 0's were just background in a graphics window? If you stand away from your screen you can see what it should look like!

I know I have to make a 2D array but I am not entirely sure how to do this? I put the "picture" into a txt file called picture.txt so I need to read it into said 2D array but I am completely lost!

[jeroenvanveghel]

(Just to warn you, haven't tested this code, so there could be compiler errors)

You can make a 2D array with the following code:

// declare the size of your array.
private int cols = 25;
private int rows = 25;

int[][] array2d = new int[rows][cols]; // 25 rows and 25 columns.

Then you need to read your file line by line. Which you do the following way:

try{
String filePath = ""; // Place you pathfile here
FileInputStream fstream = new FileInputStream(filePath);
// Get the object of DataInputStream
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));

// This is gonna be 1 line from your textfile.
String strLine;
//Read File Line By Line

int xCounter = 0;

while ((strLine = br.readLine()) != null) {
// DO SOMETHING WITH THIS LINE.
// You probably want to cut this line into chars. And then put all of those chars in your 2d array.

//declare the char array
char[] stringArray;
//convert string into array using toCharArray() method of string class
stringArray = strLine.toCharArray();

//display the array
for(int index=0; index < stringArray.length; index++) {
array2d[xCounter][stringArray[i]]);
}

xCounter++;
}
//Close the input stream
in.close();
}catch (Exception e){//Catch exception if any
System.err.println("Error: " + e.getMessage());
}


Now you have a filled 2D array.
Let's print this out in the console so you can check if everything went allright:

for(int x = 0; x < rows; x++)
{
String line = "";
for(int y = 0; y < cols; y++)
{
line += array2d[rows][cols];
}
System.out.println(line);
}

[The Dark Dragon]

OK. Sorry I forgot to mention that we have this package called the "london" package which contains classes for input (EasyReader) and graphics (EasyGraphics). This is what I have so far:

import london.*;
public class Picture {
   public static void main (String[] arg) {
   	EasyReader fileInput = new EasyReader("picture.txt");
   	EasyGraphics g = new EasyGraphics(30,30);
   	
   	private int cols = 25;
   	private int rows = 25;
   	
   	int[][] array2d = new int[rows][cols];
   	
   	String strLine;
   	
   	int xCounter = 0;
   	
   	char[] stringArray;
   	stringArray = strLine.toCharArray();
   	
   	for(int index=0; index < stringArray.length; index++) {
   	array2d[xCounter][stringArray[i]]);
   	}
   	
   	cCounter++
   }
   in.close();
}catch (Exception e){//Catch exception if any
	System.err.println("Error:" + e.getMessage());
}

But there are some errors still?!

[Norm]

there are some errors still?!

You'll have to post the error messages if you want help with them.
Or explain what the problem is.

[The Dark Dragon]

I fiddled around with it and now only have 1 error but I cannot fix it!

This is the code:

import sheffield.*;
public class Picture {
public static void main (String[] arg) {
EasyReader fileInput = new EasyReader("picture.txt");
EasyGraphics g = new EasyGraphics(30,30);

int cols = 25;
int rows = 25;

int[][] array2d = new int[rows][cols];

int xCounter = 0;

char[] stringArray;

for(int index=0; index < stringArray.length; index++) {
}

xCounter++;

}
}

The error is on the "for(int index=0; index < stringArray.length; index++) {" line and it says "variable stringArray might not have been initialized". That obviously means that I have notinitialised the variable but how do I do this and what do I initialise it to?!

[jeroenvanveghel]

But there are some errors still?!

the code you're having now, doesn't read the file.
What methods has EasyReader? Something like nextLine() maybe?

// This is where you'll read the file line by line!
// The line you read with your EasyReader is put in strLine.

while ((strLine = fileInput.readLine()) != null) {
//declare the char array
char[] stringArray;
//convert string into array using toCharArray() method of string class
stringArray = strLine.toCharArray(); 

//display the array
for(int index=0; index < stringArray.length; index++) {
array2d[xCounter][stringArray[i]]);
}

[Norm]

but how do I do this and what do I initialise it to?!

You assign the variable a value using an assignment statement:
theVariable = theValue;

The what part is up to you. What value do you want the variable to have? You could give it a null value to make the compiler happy. When/where do you ever give that variable a value?