Question

why do some people make a new reference in method to a field variable?

public class Foo {
    int mFoo[] = {1, 2, 3};

    void method() {
        int foo[] = mFoo; // WHY not just use mFoo?

        print(foo[0]); // WHY not just use mFoo?
    }
}

Answer 1

It can be a good idea if for example, at another place of your code, you change the value of mFoo. Especially in a multithreaded context, you would want to ensure you’re still working on the right data.