Question

How can i concatenate Double to String in java?

I have following piece of code:

Double price = 5.34;
String trade = MSFT;

now I have String key = price + trade, not sure if this is right way of doing it, any suggestions?

Answer 1

Java string concatenation is done by default with the + sign.

But there are times when this is not a good practice since this will create a new string instance every time you do it, so if you are in a loop this will create a new string in memory for each iteration.

So for simple cases, the + is perfectly valid.

For other cases, you should use StringBuilder.