positive: 51gw的空调,制冷量是5100w,是大二匹的空调,空调每匹的制冷量是2350w,正2匹的制冷量是4700w,型号是47外gw
negative: "<br>通过直接相减是计算不出来的,需要转换一下格式,impleDateFormat df = new SimpleDateFormat(""yyyy-MM-dd"");long to = df.parse(""2008-4-25"").getTime();long from = df.parse(""2008-1-20"").getTime();System.out.println((to - from) / (1000 * 60 * 60 * 24));(通过设置除数来设定获得数是小时数还天数)<br>"