JAVA Calender获取当前日期的前一天

public static String getDayBefore(){
    SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
    Calendar calendar = new GregorianCalendar();
    calendar.setTime(new Date());
    int i = -1;
    calendar.add(Calendar.DATE,i);
    String date= sdf.format(calendar.getTime());
    return DateUtils.unDashDate(date);
}
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