java实现输入年月日，判断为该年的第几天（采用for、witch方法）

需求：

• 编写程序，对输入的年、月、日，给出该天是该年的第多少天？

Scanner input = new Scanner(System.in);
    System.out.println("分别输入年月份：");
    System.out.print("输入年份：");
    int year = input.nextInt();
    System.out.print("输入月份：");
    int month = input.nextInt();
    System.out.print("输入本月日期：");
    int data = input.nextInt();
    int sum = 0;
    
    for (int i = 1; i < month; i++) {
      switch (i) {
      case 1:
      case 3:
      case 5:
      case 7:
      case 8:
      case 10:
      case 12:
        sum = sum +31;
        continue;
      case 4:
      case 6:
      case 9:
      case 11:
        sum = sum + 30;
        continue;
      }
    }
    if (year%4==0&&month>2) {
      sum = sum +29;
    }else if (month>2){
      sum = sum +28;
    }
    sum = sum + data;
    System.out.println("今天是"+year+"年的第"+sum+"天");

实现效果图，如：