java中时间的截取 Date Calendar

推迟一周代码：

Calendar curr = Calendar.getInstance();

curr.set(Calendar.DAY_OF_MONTH,curr.get(Calendar.DAY_OF_MONTH)+7);

Date date=curr.getTime();

推迟一月代码：

Calendar curr = Calendar.getInstance();

curr.set(Calendar.MONTH,curr.get(Calendar.MONTH)+1);

Date date=curr.getTime();

推迟一年代码：

Calendar curr = Calendar.getInstance()

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curr.set(Calendar.YEAR,curr.get(Calendar.YEAR)+1);

Date date=curr.getTime();