装箱开箱问题

Question

Getting below bug in findbug:

A boxed value is unboxed and then immediately reboxed Below is the statement:

deliveryCost = new Double(cost);

where cost is float type.

Kindly suggest.

Answer 1

That message is a little odd. I'm not sure exactly why you're getting it. But one thing you should change is this:

deliveryCost = Double.valueOf(cost);

See if the message goes away when you do that. When you say new Double(...) it's like telling java, "please, allocate a brand new object for me, even if you can reuse one and get the same effect". It's usually not necessary to do.