Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
why is doing the following so bad?
String val = null;
String someOtherValue = "hello"
val += someOtherValue;
It must be pretty bad, but why is that? I had this line in my program and it slowed everything down immensely!
I’m assuming it’s because it keeps re-creating the string? Is this the only reason though?
That exact code is perfectly fine; the compiler will optimize it away.
Doing that in a loop can be slow, since that creates a separate (immutable)
stringobject for each concatenation.Instead, use
StringBuilder.