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String class: using the substring method to obtain only the last character in the str
Given a string, return a new string where the first and last chars have been exchanged.
frontBack("code") → "eodc"
frontBack("a") → "a"
frontBack("ab") → "ba"
[FONT="Courier New"]public String frontBack(String str) { String firstLetter = str.substring(0,1); String lastLetter = str.substring([B]str.length - 1[/B, str.length); //is that valid?.. }[/FONT]
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Re: String class: using the substring method to obtain only the last character in the
Use a substring on the middle section of the string, and just use charAt to get the starting/ending characters for swapping (note: this code needs to be modified so it will check to see if the string has one or less characters, otherwise it will fail)
String flipped = str.charAt(str.length()) + str.subString(1,str.length() - 1) + str.charAt(0);
Substring works like this:
The first parameter is the index of the character to include. The second parameter is the index of the character to stop before (this character is not included).
ex:
String str = "0123456789"; System.out.println(str.substring(2,4)); // will printout "23"
etidd (February 4th, 2010)
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