error: 'List ' is Abstract cannot be defined

Question

I intend to use java with Android Studio to make a calculator, however, every time I click an add button to a list the values of these buttons.

But having error in the list statement. someone can help me?

Answer 1

You’re not programming C#, that’s Java.

You can’t instantiate it List in Java, because List is an abstract class. You can instantiate a ArrayList.

List<Character> Conta = new ArrayList<Character>();