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How to create a grid and display the item at (0,0)?

Posted on 2006-10-28
11
282 Views
Last Modified: 2010-03-31
Hi experts,

I have a question on java, I want to create a 21x21 grid (from -10 to +10 on each
axis). Furthermore, I want my first item to be displayed at the centre, at position (0,0).

I do not know how to go about starting it, please enlighten!

hy
0
Comment
Question by:heyhey84
[X]
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11 Comments
 
LVL 6

Expert Comment

by:valipotor
ID: 17824979
Hi
Use the GridLayout.

valipotor
0
 
LVL 6

Expert Comment

by:valipotor
ID: 17824981
0
 

Author Comment

by:heyhey84
ID: 17824995
valipotor,

I've searched the page before, but can i don't use GridLayout?
Like just delcare it as a private class, and call it.

Furthermore, is there any sample codes? because I'm clueless in starting it!
Thanks in advance.

hy
0
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LVL 6

Expert Comment

by:valipotor
ID: 17824998
You don't want to use GridLayout?
Or you don't know how?
0
 

Author Comment

by:heyhey84
ID: 17825011
Frankly, I don't know how to

and I thought that the private method is easier?? please feel free to correct me!!
Thanks for the help.

hy
0
 
LVL 6

Expert Comment

by:valipotor
ID: 17825076
import java.awt.*;
 import java.applet.Applet;
 public class ButtonGrid extends Applet {
     public void init() {
         setLayout(new GridLayout(21,21));
         for(int i=0;i<21;i++)
           for(int j=0;j<21;j++)
          {
            add(new JLabel());
           if (i==11 & j==11)
           {
             //this is the center cell
           }
         }
     }
 }
0
 

Author Comment

by:heyhey84
ID: 17825188
thanks for the help so far,

if I use GridLayout, it will pop a window to display the grid,
but I just want to print the grid (as in white spaces) on the testing platform (unix or linux),
therefore cannot use applet, apologise that I did not state clearly in my question,

is there any alternative rather then the GridLayout option?

hy
0
 
LVL 6

Expert Comment

by:valipotor
ID: 17825333
  for(int i=0;i<21;i++)
           for(int j=0;j<21;j++)
          {
            System.out.print("[ ]");
           if (i==11 & j==11)
           {
             //this is the center cell
           }
System.out.println();
         }
0
 

Author Comment

by:heyhey84
ID: 17828413
valipotor,

I've tried using the code above, it gave a very large output, below are only part of the output, when I tried to print out something within the if statement,

           if (i==11 & j==11)
           {
             System.out.print("?");
           }
 
the printout is as follows, care to advise?? Thanks in advance.

[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]?

[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]
[ ]

hy
0
 
LVL 6

Expert Comment

by:valipotor
ID: 17828427
Sorry, here is the correct form:

for(int i=0;i<21;i++)
{
           for(int j=0;j<21;j++)
           {
               System.out.print("[ ]");
               if (i==11 & j==11)
               {
                     //this is the center cell
                }
         }
System.out.println();
}
0
 
LVL 6

Accepted Solution

by:
valipotor earned 20 total points
ID: 17828429
A better version:

for(int i=0;i<21;i++)
{
           for(int j=0;j<21;j++)
           {
               
               if (i==11 & j==11)
               {
                     //this is the center cell
                     System.out.print("[x]");
                }            
                else
                {
                     System.out.print("[ ]");
                }
         }
System.out.println();
}
0

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