CS 4773 Object Oriented Programming, Spring 2000
Assignment 2 Comments

• empty string
• string of only blanks
• string with no blanks
• string with no multiple blanks
• string with leading and trailing blanks
• string with multiple blanks

• input.short: 4 blanks only, results in a string a size 0.
• input.medium: 1024 bytes, result: size = 935, blanks = 164
• input.long: 10240 bytes, result: size = 9349, blanks = 1669

• Total of 30 points
• One point taken off for each missing important test
• One point taken off it I could not tell what mode the local/remote was in
• Two points taken off if input.short was not handled correctly

• Most people assumed a font height
• Also assumed that a button of a certain height would fit
• The status line not a good place to indicate mode of toggle as the browser will write to the status line when doing network I/O
• When using BorderLayout, use the constants, not the strings
• It is usually not a good idea to use FlowLayout
• Button locations should be logical
• Should be able to tell when the calcualtion has been started
• It is best to keep inforamation about the input on the screen after the blanks have been removed
• It would be nice to have some instructions on the screen.
• You do not have to use new String("xx");
• Avoid using if () ; else { }
• Clear out info on screen when not relevant
• Use arrays for test strings
• Note that StringTokenizer allows you to specify the delimiters to use You should read the documentation on StringTokenizer: specify delimiters

Sample code:

   public static String removeBlanksString(String s) {
      String s1 = "";    
      int i = 0;    
      while ( (i < s.length()) && (s.charAt(i) == ' ') ) i++;
      while (i < s.length()) {
         while ( (i < s.length()) && (s.charAt(i) != ' ') ) {
            s1 = s1 + s.charAt(i);
            i++; 
         }
         while ( (i < s.length()) && (s.charAt(i) == ' ') ) i++;
         if (i >= s.length()) return s1;
         s1 = s1 + " ";  
      }  
      return s1; 
   }
 
   public static String removeBlanksBuffer(String s) {
      StringBuffer s1;   
      int i = 0;
      s1 = new StringBuffer();
      while ( (i < s.length()) && (s.charAt(i) == ' ') ) i++;
      while (i < s.length()) {
         while ( (i < s.length()) && (s.charAt(i) != ' ') ) {
            s1.append(""+s.charAt(i));
            i++; 
         }
         while ( (i < s.length()) && (s.charAt(i) == ' ') ) i++;
         if (i >= s.length()) break;
         s1.append(" "); 
      }  
      return s1.toString();
   }
 
   public static String removeBlanksTokenizer(String s) {
      StringBuffer s1;   
      StringTokenizer tok;

      s1 = new StringBuffer();
      tok = new StringTokenizer(s," ");
      if (tok.hasMoreTokens())
         s1.append(tok.nextToken());
      while (tok.hasMoreTokens()) {
         s1.append(" " +tok.nextToken());
      }  
      return s1.toString();
   }

30  0
29  1
28  1
27  3
26  2
25  3
24  2
23  2
22  1
21  1
20  1
below 20: 6
pending grades: 5