Java 获取Date的“昨天”和“明天”

Java 获取Date的“昨天”和“明天”

使用日历类：Calendar

@Test
    public void dateTest() {
        Date today = new Date();
        for(int i=0;i<10;i++) {
            today = yesterday(today);
            System.out.println(today);
        }
        System.out.println("------------");
        for(int i=0;i<10;i++) {
            today = tomorrow(today);
            System.out.println(today);
        }

    }

    /**
     * 返回昨天
     * @param today
     * @return
     */
    public Date yesterday(Date today) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(today);
        calendar.set(Calendar.DATE, calendar.get(Calendar.DATE) - 1);
        return calendar.getTime();
    }

    /**
     * 返回明天
     * @param today
     * @return
     */
    public Date tomorrow(Date today) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(today);
        calendar.set(Calendar.DATE, calendar.get(Calendar.DATE) + 1);
        return calendar.getTime();
    }