Java 字母大小写比较

public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in=new Scanner(System.in);	
		String x=in.next();
		char n=x.charAt(0);**//字母比较**
		if(n>='A'&&n<='Z') {
			System.out.println("DA");
		}else {
			System.out.println("XIAO");
			//如果是数字,还是输出"XIAO"
		}
			}