Why is “” marked for Java in sonarqube

In Java, I can convert int to string by "" intvalue

Why is this inappropriate As far as I know, integer ToString (intvalue) is more detailed and the same

I can imagine marking it if it is not '', but the object x is used as X intvalue, where x is initialized as an integer Use JavaScript code for similar operations

Solution

As to why it's so bad, Java automatically optimizes string connections to use StringBuilder This means by doing so

"" + d

Are you really doing it

new StringBuilder().append(d).toString();

If you do

d + ""

You finally compiled

new StringBuilder(String.valueOf(d)).toString();

Compared with just making a phone call, this is a considerable waste of resources

String.valueOf(d);