How to optimize Java code when working with strings?

Question

Java

Good afternoon, there is a code that parses the log and normalizes it.

for (String a : rawToMassive) {
            if (a.contains("Var1:")) {
                a = a.replace("^Var1:", condition + ",");
                a = a + System.lineSeparator();
                out.append(a);

            }

I don't like that when I do an if , my String object is re-created twice. Is it possible to optimize it somehow?

Answer 1

yes, use StringBuilder