java List of Strings to Array of Strings [duplicate]

Question

I want to know if it's possible to convert a Java List of Strings to an array of Strings:

I tried this:

List<String> products = new ArrayList<String>();
//some codes..
String[] arrayCategories = (String[]) products.toArray();

but it gives me an exception message:

java.lang.ClassCastException: java.lang.Object[] cannot be cast to java.lang.String[]

Answer 1

String[] array = products.toArray(new String[products.size()]);

Answer 2

Use

String[] arrayCategories = products.toArray(new String[products.size()]);

products.toArray() will put list values in Object[] array, and same as you cant cast object of super type to its derived type like

//B extands A
B b = new A();

you can't store or cast Object[] array to String[] array so you need to pass array of exact type that you want to be returned.

Additional info here.

Answer 3

Try

List<String> products = new ArrayList<String>();
        String[] arrayCategories = products.toArray(new String[products.size()]);

Answer 4

This should do the trick. You got an typo in the first line.

List<String> products = new ArrayList<>();
String[] array = (String[]) products.toArray();