Reverse String

Java

class Solution {
	public void reverseString(char[] s) {
		if (s == null || s.length == 0) {
			return;
		}
		int i = 0;
		int j = s.length - 1;
		for (i = 0; i < j; i++) {
			char temp = s[i];
			s[i] = s[j];
			s[j] = temp;
			j--;
		}
	}
}