问题
I need to set byte value as method parameter. I have boolean variable isGenerated, that determines the logic to be executed within this method. But I can pass directly boolean as byte parameter this is not allowed and can't be cast in java. So the solution I have now looks like this:
myObj.setIsVisible(isGenerated ? (byte)1 : (byte)0);
But it seems odd for me. Maybe some better solution exists to do this?
回答1:
your solution is correct.
if you like you may avoid one cast by doing it the following way:
myObj.setIsVisible((byte) (isGenerated ? 1 : 0 ));
additionally you should consider one of the following changes to your implementation:
change your method to something like setVisiblityState(byte state) if you need to consider more than 2 possible states
change your method to setIsVisible(boolean value) if your method does what it's looking like
回答2:
You can use this solution. I found it on this very useful page
boolean vIn = true;
byte vOut = (byte)(vIn?1:0);
回答3:
It is not odd. It is OK. The odd is that you need to transform typed boolean value to not self explainable byte. However sometimes we have to do this when working with legacy APIs.
BTW if you want to save memory you can use 1 bit instead of byte, so you can group several boolean flags together while using bit for each boolean value. But this technique is relevant for huge amounts of data only when saving several bytes can be significant.
来源：https://stackoverflow.com/questions/25360375/convert-from-boolean-to-byte-in-java