Answer:

The loop continues prompting until the user enters an integer greater or equal to 5. (Actually, 5 is dangerously small for a password.)

String of Characters

Next, the program assembles a string of all the characters that could go into a password:

    String choices = "abcdefghijklmnopqrstuvwxyz" ;
    choices = choices + choices.toUpperCase() ;
    choices = choices + "1234567890" ;

The first of these three statements creates a string literal containing the lower case alphabet. Then the expression choices.toUpperCase() creates a string that is all upper case, based on the string currently refered to by choices. This string is then concatenated onto the original choices string:

choices = choices + choices.toUpperCase();

Recall that + means "string concatenation". Finally, the string "1234567890" is concatenated onto the string to produce the final string, shown below:

"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"

QUESTION 15:

Would the statement

choices = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";

have worked as well?