Selective Copying of Characters

Another possibility is to use the String method equalsIgnoreCase(). But it is probably easiest to ignore case from the start. Here is the method:

We will soon use the reverse() method of StringBuffer. But first we need to copy only the characters 'a' through 'z' into azBuffer. This is how the method ignores spaces and punctuation.

class Tester
{
  public boolean test( String trial )
  {
    // convert all characters to lower case
    String lower = trial.toLowerCase();

    StringBuffer azBuffer  = new StringBuffer();

    for ( int j=0; j < ; j++ )
    {
       // copy only 'a' through 'z' to the buffer
       char c = lower.charAt(j);
       if ( c >= 'a' && c <= 'z' )
         azBuffer.( c );
    }
    . . . .

  }
}

public class PalindromeTester
{
  . . . . .
}

QUESTION 10:

Fill in the blanks with the appropriate methods from class String and StringBuffer. (Look at the list of methods a few pages back.)

Answer:

Selective Copying of Characters

QUESTION 10: