IT IT 145 ZyBooks 3.11.docx - PARTICIPATION ACTIVITY 3.11.1...

PARTICIPATION
ACTIVITY
3.11.1: Character methods.
To what value does each evaluate? userStr is "Hey #1?".
1)
Character.isLetter('7')
True
False
Correct
'7' is not an alphabetic letter (a-z or A-Z.)
2)
Character.isLetter(userStr.charAt(0))
True
False
Correct
'H' is alphabetic.
3)
Character.isWhitespace(userStr.charAt(3))
True
False
Correct
That character is a space ' ' between the y and #.
4)
Character.isDigit(userStr.charAt(6))
True
False
Correct
That character is '?'.
5)
Character.toUpperCase(userStr.charAt(1)) returns 'E'.
True
False
Correct
'e' becomes 'E'.

6)
Character.toLowerCase(userStr.charAt(2)) yields an error because 'y' is
already lower case .
True
False
Correct
No error, just returns 'y'.
7)
Character.toLowerCase(userStr.charAt(6)) yields an error because '?' is not
alphabetic.
True
False
Correct
No error, just returns '?'.
CHALLENGE
ACTIVITY
3.11.1: String with digit.
Set hasDigit to true if the 3-character passCode contains a digit.
import java.util.Scanner;
public class CheckingPasscodes {
public static void main ( String [] args) {
Scanner scnr = new Scanner( System .in);