What happens when Java Compiler sees many String concatenations in one line?

Suppose I have an expression in Java such as:

String s = "abc" + methodReturningAString() + "ghi" + 
                anotherMethodReturningAString() + "omn" + "blablabla";

What's the behaviour of the Java's default JDK compiler? Does it just makes the five concatenations or there is a smart performance trick done?