What's the difference between adding DAY_OF_MONTH or DAY_OF_YEAR to a Calendar object in java?

What's the difference between adding DAY_OF_MONTH or DAY_OF_YEAR to a Calendar object in java?

In Java's Calendar class, both DAY_OF_MONTH and DAY_OF_YEAR are fields that represent different concepts related to days, and they are used to manipulate and retrieve information from a Calendar object. However, they have distinct meanings and purposes:

  1. DAY_OF_MONTH:

    • DAY_OF_MONTH represents the day of the month within the current year.
    • It ranges from 1 to the maximum number of days in the given month (e.g., 1 to 31 for January).
    • When you set or get the DAY_OF_MONTH field, you are working with the day of the month within the current year, regardless of which month it is.

    Example:

    Calendar calendar = Calendar.getInstance(); calendar.set(Calendar.DAY_OF_MONTH, 15); // Sets the day of the month to 15 int dayOfMonth = calendar.get(Calendar.DAY_OF_MONTH); // Gets the day of the month (e.g., 15)

  2. DAY_OF_YEAR:

    • DAY_OF_YEAR represents the day of the year within the current year.
    • It ranges from 1 (the first day of the year) to 365 or 366 (the last day of the year, depending on whether it's a leap year).
    • When you set or get the DAY_OF_YEAR field, you are working with the day of the year, which is independent of the month.

    Example:

    Calendar calendar = Calendar.getInstance(); calendar.set(Calendar.DAY_OF_YEAR, 200); // Sets the day of the year to 200 int dayOfYear = calendar.get(Calendar.DAY_OF_YEAR); // Gets the day of the year (e.g., 200)

In summary:

  • DAY_OF_MONTH is related to the day of the month within the current year, and it can vary based on the month.
  • DAY_OF_YEAR is related to the day of the year within the current year, and it counts days independently of the month.

The choice between them depends on the specific use case and the information you need to manipulate or retrieve from the Calendar object.

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