Date#getDate()是JDK 1.1之后的棄用方法.您應該使用

Calendar類來操縱日期.

Prior to JDK 1.1, the class Date had two additional functions. It

allowed the interpretation of dates as year, month, day, hour, minute,

and second values. It also allowed the formatting and parsing of date

strings. Unfortunately, the API for these functions was not amenable

to internationalization. As of JDK 1.1, the Calendar class should be

used to convert between dates and time fields and the DateFormat class

should be used to format and parse date strings. The corresponding

methods in Date are deprecated.

在使用Date#getDate()的API中也清楚地記錄了使用Calendar#get(Calendar.DATE);

Deprecated. As of JDK version 1.1, replaced by

Calendar.get(Calendar.DAY_OF_MONTH)

Calendar cal = Calendar.getInstance();

cal.add(Calendar.DATE, -1);

return dateFormat.format(cal.getTime());

總結

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