JAVA将时间串18:00:00和日期年月日合并起来

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SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
				 Date now = new Date();
				 SimpleDateFormat ds = new SimpleDateFormat("yyyy-MM-dd ");
				 Date startTime = df.parse(ds.format(now) +"18:00:00");

startTime = 2018-01-19 18:00:00

当前日期加一天 并且和 时间串合并:

 Calendar c = Calendar.getInstance();  
				     c.setTime(now);  
				     c.add(Calendar.DAY_OF_MONTH, 1);
					 Date endTime = df.parse(ds.format(c.getTime()) + "18:00:00");
endTime = 2018-01-20 18:00:00

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