public static void input() throws WhiteSpaceException{
			String username = "Tidak Boleh Memakai Spasi";
			
			char[] charArray = username.toCharArray();
			for (char c : charArray) {
				if(c == ' '){
					throw new WhiteSpaceException (username);
				}
			}
			
			System.out.println("Kalimat ini " + username);
		}