Java How To Program, Late Objects, 11th Edition

... otherwise, false.

Line 19 uses Character method isLetter to determine whether character c is a letter. If so, the method returns true, and otherwise, false. Line 21 uses Character method isLetterOrDigit to determine whether character c is a letter or a digit. If so, the method returns true, and otherwise, false.

Line 23 uses Character method isLowerCase to determine whether c is a lowercase letter. If so, the method returns true, and otherwise, false. Line 25 uses isUpperCase to determine whether c is an uppercase letter. If so, the method returns true, and otherwise, false. Line 27 uses Character method toUpperCase to convert the character c to its uppercase equivalent. The method returns the converted character if the character has an uppercase ...