Update New to Java

[Jaguar1998]

Okay I would like to let everyone know that I am trying to figure out how to make my code work to where it will check and allow my soduku puzzle to be one that is legal by the rules of soduku.

I am using Eclipse and when ever I type for for the forloop (which beinging a a green horn to Java I do not understand what this fully does.
I would like to see guidance for the code and if someone knows of a very good Java book that I could get that would help me understand Java well for a greenhorn let me know because I really need to know.

private void initGame()
{
Random r = new Random( 9 );
for (int i = 0; i < 9; i++)
{
for (int j = 0; j < 9; j++)
{
int randomValue = r.nextInt( 9 ) + 1;
if (IsValid( i, j, randomValue ))
{
cells[i][j].setText( String.valueOf( randomValue ) );
} else
{
j--;
}
}
}
}
private boolean IsValid( int row, int column, int value )
{
System.out.println( "Checking " + row + " " + column + " for " + value );
{
{
return true;
}
}}}I would hope that everyone could help me out on this and those who do thank you so much and also thanks for suggesting java books to help me understand the language better.;):)

[Fubarable]

Duplicate thread closed. Please let's keep only one thread per question. Thank you for your cooperation. Also, please have a look at the FAQ (or my signature links) regarding code tags. Much luck!

[Eranga]

First of all, did you run this code and have a look at the results?

[Jaguar1998]

When I have ran the program it shows a grid in a window of about 600 by 600 it is a gui and so I think that is why I am having such a headache with this being my first programming language.

[Eranga]

Are you talking about the code segment you've post before? Seems there is no connection with what you've post and what you are saying now.

[Jaguar1998]

I am confused on the first question for which you were asking.

I am trying to create a for loop in an attempt that I can stop the same numbers in the same column and row.

[Eranga]

According to your code segment above you have 9 X 9 block simply. Later you said that you've a grid of 600 by 600....

[Jaguar1998]

Oops sorry I meant my window is a 600 x 600 and the boxes are a 9x9.

I really hope that this clarifies everything.

[porchrat]

Okay I would like to let everyone know that I am trying to figure out how to make my code work to where it will check and allow my soduku puzzle to be one that is legal by the rules of soduku.

I am using Eclipse and when ever I type for for the forloop (which beinging a a green horn to Java I do not understand what this fully does.
I would like to see guidance for the code and if someone knows of a very good Java book that I could get that would help me understand Java well for a greenhorn let me know because I really need to know.

If you are using eclipse could you please try formatting the code you post correctly so that we don't have to read something all squeezed into the margin? Why stop there why not remove the whitespace altogether? :p

Seriously though the for loop will just iterate until the conditions you have stated are evaluated true. There are plenty of tutorials online to help you until you decide on a book. Here is a Sun tutorial for "for loops" which will help you understand them a little better:

The for Statement (The Java™ Tutorials > Learning the Java Language > Language Basics)

I quite like Absolute Java as a book because it starts from the beginning with object orientation and basic constructs like loops and switches and works through to somewhere in GUIs if I am not mistaken, but it is a fair amount of reading.

EDIT: I also feel I should warn you now that there is something you have not yet considered with that code. Just checking that the rows and columns don't contain duplicate numbers is not enough to ensure that the sudoku puzzle is legitimate. You also need to check every single one of the 9 3x3 blocks in the puzzle for duplicates.

[Eranga]

Oops sorry I meant my window is a 600 x 600 and the boxes are a 9x9.

I really hope that this clarifies everything.

Yeah, now it's much clear.