求当前日期是该年第几天

public static void main(String[] args) {
    Scanner scanner=new Scanner(System.in);
    int a=scanner.nextInt();
    int b=scanner.nextInt();
    int c=scanner.nextInt();
    Calendar ca1 = Calendar.getInstance();
    ca1.set(a, b-1, c);
    int num = ca1.get(Calendar.DAY_OF_YEAR);
    System.out.println(num);
}