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LengthofLastWord.java

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LengthofLastWord.java

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/**

* Given a string s consists of upper/lower-case alphabets and empty space

* characters ' ', return the length of last word in the string.

*

* If the last word does not exist, return 0.

*

* Note: A word is defined as a character sequence consists of non-space

* characters only.

*

* For example, Given s = "Hello World", return 5.

*/

public class LengthofLastWord {

public int lengthOfLastWord(String s) {

int i = s.length() - 1;

while (i >= 0 && s.charAt(i) == ' ') {

i--;

}

if (i < 0)

return 0;

int j = i;

while (j - 1 >= 0 && s.charAt(j - 1) != ' ') {

j--;

}

return i - j + 1;

}

}