Java for loop by value or by reference

Question

I figured out a a problem in my Code. First the code:

public class Main {

    /**
     * @param args
     */
    public static void main(String[] args) {
           


        

Answer 1

When you want to do a low level optimization, know how, you have to look inside Java code and inside byte-code either(compiled code)

for(String s : blablubb) {
            s = "over";
}

is equals with:

for (int i = 0; i < blablubb.length; i++) {
     String s = blablubb[i];            
     s = "over";
}

and that's why the output as how it is.