String Processing

(1) < String > .length () -- < int >     ``CS1 exams are fun!   '' .length () -- 18

 

(2) < String > .indexOf (< String >) -- < int >     ``frim fram sauce''.indexOf (``fr'') -- 0   ``frim fram sauce''.indexOf (``fra'') -- 5

 

(3 a) < String > .substring (< int >) -- < String >

 

Returns the substring from the position specified by the parameter tot the end of the string.  

``monday''.substring (3) -- ``day''

 

(3 b) < String > .substring (< int >,  < int >)       -- < String >

 

Returns the substring from the position of the first parameter to the position one less than the sexond parameter.  

``tired hand''.substring (2,  7) -- ``red h''

 

Note....  

``cat'' ==  ``dog'' -- This only works   for numbers!!!

 

(4) < String > .equals (< String >) -- < boolean >   ``cat''.equals (``dog'') -- false   ``cat''.equals (``cat'') -- true   ``cat''.equals (``Cat'') -- false

 

(5) < String > .equalsIgnoreCase (< String >)

 

(6) < String > .compareTo (< String >) -- < int >

 

Returns...

• 0 if the two strings are equal.
  
• Something negative if the receiving string is alphabetically less than the parameter.
  
• Something positive if the receiving string is alphabetically greater than the parameter.
  

``cat''.compareTo (``bat'') -- something positive   ``bat''.compareTo (``bats'') -- something negative

 

Global procedural appliation architecture problem continued...  

static private void computeTheAverage ()   {       int sum = 0;       for (int x = 0;  x < nrElements;  x + +)       {         sum = sum + a [x];       }       average = (double) sum / (double) nrElements;       static private void displayTheNumbersAboveAverage ()   {       for (int x = 0;  int < nrElements;  x = x + 1)       {         if (a [x] > average)         {           IO.println (a [x]);         }       }   }