Java - Strings

Difficulty: Low

Title: CharAt

Description:
Write a program where the user enters a string, and the program echo's it to the monitor with one character per line:

• To do this you will need to use the following method from class String: char charAt( int index )
• This method returns the character that is at index inx of the String. Characters are indexed beginning at index 0.

Output:
Enter a string:
Octopus
O
c
t
o
p
u
s

Difficulty: Medium

Title: Name Echo

Description:
Write a program that asks for user's first and last name in one input and then writes it back with the first name as entered, and the second name all in capital letters. Assume that there are two names, and that they are separated by a single space character. Use the trim() method to remove possible leading spaces.

The following String methods will help you complete this exercise:

• trim()
• int indexOf( String )
• String substring( int startindex )
• String substring(int start, int end)
• String concat( String str ) — or use the + operator
• String toUpperCase()

Last part is to test if there were indeed more than one name entered. (Test that the value returned from indexOf() is greater than zero.) If not, merely echo the input.

NOTE: This is part of error handling, because if you don't several of your string methods will trigger StringIndexOutOfBoundsException errors.

Output:
Enter your name: Sherlock Holmes
Sherlock HOLMES