java 时间相减精度确实 中间的不能直接取整数

 long time = new Date().getTime();
        long time1 = item.getAcate().getTime();
        long l1 = time - time1;
        double v1 = l1 * item.getCgress() * 0.01;
        double v = time1 + v1;
        long l = new Double(v).longValue();

        return new Date(l);