Calculate the day of the week for a specified date in java

First define an array of weeks. Because the array starts from 0, Sunday is put first, as shown in the figure:

Get the Calendar object, and wait to operate the date and time, as shown in the figure:

Set the passed in time into the Calendar object, as shown in the figure:

Because the DAY_OF_WEEK of the running environment starts from Sunday, you need to subtract 1 here, as shown in the figure:

After execution The result is returned, as shown in the figure:

Write a test method to call the above completed method, as shown in the figure:

Print The execution result is displayed and the day of the week is displayed, as shown in the figure:

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