<pre>public class Solution { /** * @param character: a character * @return: a character */ public char lowercaseToUppercase(char character) { // write your code here if (character <= 'z' && character >= 'a') { character -= ('a' - 'A'); } else if (character <= 'Z' && character >= 'A') { character += ('a' - 'A'); } return character; } }</pre>