正如在顶部的回答中提到的，自从java 8以来，它可以做到:

Date dt = new Date();
LocalDateTime.from(dt.toInstant()).plusDays(1);

但这有时会导致像这样的DateTimeException:

java.time.DateTimeException: Unable to obtain LocalDateTime from TemporalAccessor: 2014-11-29T03:20:10.800Z of type java.time.Instant

可以通过简单地传递时区来避免此异常:

LocalDateTime.from(dt.toInstant().atZone(ZoneId.of("UTC"))).plusDays(1);

你想在几天后找到日期这个代码尝试..

public Date getToDateAfterDays(Integer day) {
        Date nowdate = new Date();
        Calendar cal = Calendar.getInstance();
        cal.setTime(nowdate);
        cal.add(Calendar.DATE, day);
        return cal.getTime();
    }

正如在顶部的回答中提到的，自从java 8以来，它可以做到:

Date dt = new Date();
LocalDateTime.from(dt.toInstant()).plusDays(1);

但这有时会导致像这样的DateTimeException:

java.time.DateTimeException: Unable to obtain LocalDateTime from TemporalAccessor: 2014-11-29T03:20:10.800Z of type java.time.Instant

可以通过简单地传递时区来避免此异常:

LocalDateTime.from(dt.toInstant().atZone(ZoneId.of("UTC"))).plusDays(1);

您可以在导入org.apache.commons.lang.time.DateUtils后使用此方法:

DateUtils.addDays(new Date(), 1);

Java 8 LocalDate API

LocalDate.now（）.plusDays（1L）;

java8时间API:

Instant now = Instant.now(); //current date
Instant after= now.plus(Duration.ofDays(300));
Date dateAfter = Date.from(after);