java - 获取昨天 - 日期类型的方法 getDate() 已弃用

Question

我试图获取昨天的日期。所以我写了下一个函数:

public  String getYestrday() {
    DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
    Date date = new Date();
    return dateFormat.format(date.getDate() - 1);
}

但它给了我下一个警告:

The method getDate() from the type Date is deprecated

但它不起作用。

感谢您的帮助。

Answer 1

Date#getDate()是 JDK 1.1 之后弃用的方法。你应该使用 Calendar类而不是操纵日期。

来自 API :

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 API 中使用 Date#getDate() 也清楚地记录了这一点使用 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());