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A question about Java array

2 replies on 1 page. Most recent reply: Feb 5, 2011 6:28 AM by Charles Bell

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Baran Dorell

Posts: 1
Nickname: barand
Registered: Jan, 2011

A question about Java array

Posted: Jan 1, 2011 5:38 AM

 public class PlaneSeatMain
{
  public static void main(String[] args)
  {
    char[][] seat = 
    {  
      {'X', '*', '*', '*', '*', '*'}, 
      {'*', 'X', '*', '*', '*', '*'},
      {'*', 'X', '*', '*', '*', '*'},
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', 'X', '*', '*', '*'},
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', '*', 'X', '*', '*'}, 
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', '*', '*', '*', '*'}, 
    };
    
    System.out.println("seat 0,0: " + seat[0][0]);
    System.out.println("seat 2,4: " + seat[2][4]);
    
  }
}

I want to change values of seat as:

 char[][] seat = 
    {  
      {'X', '*', '*', '*', '*', '*'}, 
      {'*', 'X', '*', '*', '*', '*'},
      {'*', 'X', '*', '*', '*', '*'},
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', 'X', '*', '*', '*'},
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', '*', 'X', '*', '*'}, 
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', '*', '*', '*', '*'}, 
    };

but after using

 char[][] seat =
{
...
};

the compiler gives error if I use it again to change the values, because:

"seat is already defined in main(java.lang.String[])"

Vincent O'Sullivan

Posts: 724
Nickname: vincent
Registered: Nov, 2002

Re: A question about Java array

Posted: Jan 2, 2011 5:48 AM

You only need to use "char[][]" once, to define seat as a char array. Thereafter, just use "seat =" to update its value.

Charles Bell

Posts: 519
Nickname: charles
Registered: Feb, 2002

Re: A question about Java array

Posted: Feb 5, 2011 6:28 AM

     seat = new char[][]    {  
      {'X', '*', '*', '*', '*', '*'}, 
      {'*', 'X', '*', '*', '*', '*'},
      {'*', 'X', '*', '*', '*', '*'},
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', 'X', '*', '*', '*'},
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', '*', 'X', '*', '*'}, 
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', '*', '*', '*', '*'}, 
      {'*', '*', '*', '*', '*', '*'}, 
    };

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