Java中String時間范圍比較

public static void main(String[] args) throws ParseException {

String firstDate = "2019-01-01"; 
String lastDate = "2019-012-31"; 
String createdTime = "2019-07-20";

SimpleDateFormat sdf =new SimpleDateFormat("yyyy-MM-dd"); //創建日期轉換對象：年 月 日
Long time = sdf.parse(createdTime).getTime();
Long time1 = sdf.parse(firstDate).getTime();
Long time2 = sdf.parse(lastDate).getTime();

if(time>=time1 && time<=time2){//轉成long類型比較
System.out.println("在該時間段范圍內");
}else{
System.out.println("不在該時間段范圍內");
}

}