java中在获取的系统时间上推迟一周,或者一年

推迟一周：

Calendar curr = Calendar.getInstance();
curr.set(Calendar.DAY_OF_MONTH,curr.get(Calendar.DAY_OF_MONTH)+7);
Date date=curr.getTime();

推迟一个月：

Calendar curr = Calendar.getInstance();
curr.set(Calendar.MONTH,curr.get(Calendar.MONTH)+1);
Date date=curr.getTime();

推迟一年：

Calendar curr = Calendar.getInstance();
curr.set(Calendar.YEAR,curr.get(Calendar.YEAR)+1);
Date date=curr.getTime();