double dayCount = 0;long startTime= rs.getLong(3);long unSubTime = rs.getLong(4);dayCount = (unSubTime - startTime) / 86400000;现在 断点一下看 unSubTime 等于1275373946000 startTime=1275321600000 算出来 应该是0.6几 为什么dayCount 会是0.0呢?