有没有大佬

public static void demo() throws Exception {
Scanner myScanner = new Scanner(System.in);
System.out.println("请输入数字：");
String number = myScanner.next();
System.out.println("number = " + number);
if(StringUtils.isEmpty(number)) throw new Exception("未获取到输入内容");
if(!StringUtils.isNumeric(number)) throw new Exception("你输入的内容不符合规范");
switch (number){
case "1":
System.out.println(" 红灯 ");
break;
case "2":
System.out.println(" 绿灯 ");
break;
case "3":
System.out.println(" 黄灯 ");
break;
default:
System.out.println(" 输入不正确 ");
break;
}
}