Ignoring of blanks

[petr pavlovich]

Hi!
How to make so that in lines coming and after standing blanks were ignored?
that is
" aaa " = "aaa" ="aaa ''
Name entrance and a way to target files should be set in the form of two parameters of a command line.
in my program

class SortString 
{
  static String arr[] = 
    {"ddd", "sss", "aaa", "ggg", "aaa", "bbb",    
     "ddd", "ccc",  };

  public static void main(String args[]) 
 
  { 
    for (int j = 0; j < arr.length; j++) 
    {
    
      for (int i = j + 1; i < arr.length; i++) 
      { 
        if (arr[i].compareTo(arr[j]) < 0) 
        { 
          String t = arr[j];
          arr[j] = arr[i];
          arr[i] = t;
        } 
      }  
      //System.out.println(arr[j]);
 
    } 
    String prevItem = null;
    for (final String item : arr){
      if (!item.equals(prevItem)){
    	  System.out.println(item);
    	  }
      prevItem = item;
  
  }

}
  }
 

[John Jai]

Hi Petr,
I dont understand the program completely. But still is the question is about trimming beginning and trailing white space in string - then use trim() function in String class.

[petr pavlovich]

Hi John Jai!
my program: sorting (alphabetically) and outputs the string without repetitions.

[petr pavlovich]

if the array change"aaa" on " aaa ", the program will not work correctly.

John Jai wrote:Hi Petr,
use trim() function in String class.

how to apply, I do not understand (

[Ashish Schottky]

@petra: Welcome to Javaranch.
This seems to be a home-work problem.And you have done well.
just use a for-loop and use trim for every string.

   for(int trim_index=0;trim_index<arr.length;trim_index++)
        {
            arr[trim_index]=arr[trim_index].trim();
        }

[petr pavlovich]

Ashish Schottky wrote:@petra: Welcome to Javaranch.

thanks

Ashish Schottky wrote:
This seems to be a home-work problem.And you have done well.
just use a for-loop and use trim for every string.

   for(int trim_index=0;trim_index<arr.length;trim_index++)
        {
            arr[trim_index]=arr[trim_index].trim();
        }

Excuse but don't know as to apply your code
The compiler gives out errors

class SortString 
{
  static String arr[] = 
    {"ddd", "sss", "aaa", "ggg", " aaa ", "bbb",    
     "ddd", "ccc",  };
  
  public static void main(String args[]) 
  
  
  
  
  for(int trim_index=0;trim_index<arr.length;trim_index++)
  {
	  arr[trim_index]=arr[trim_index].trim(); 
  }
 
  
  
  
  { 
    for (int j = 0; j < arr.length; j++) 
    {
    
      for (int i = j + 1; i < arr.length; i++) 
      { 
        if (arr[i].compareTo(arr[j]) < 0) 
        { 
          String t = arr[j];
          arr[j] = arr[i];
          arr[i] = t;
        } 
      }  
      //System.out.println(arr[j]);
 
    } 
    String prevItem = null;
    for (final String item : arr){
      if (!item.equals(prevItem)){
    	  System.out.println(item);
    	  }
      prevItem = item;
  
  }

}
  }

=)

[Campbell Ritchie]

. . . and what errors do you get? I can see at least one error. There is a { missing. There might be more; I haven't checked carefully.

You should be writing your code from outside in, not from top to bottom. I would appear to have written that sort of thing before. Look at the links from it, particularly the second.

[petr pavlovich]

Campbell Ritchie wrote: particularly the second.

thanks!!
I will well write