Why doesn't the length method work?

Question

Java

Hello, writes cannot resolve the method length, I don’t understand why, if I need to take the length of the array with it?

Answer 1

In order for the ArrayList to know what objects are stored in it, you need to specify their class explicitly: Then list.get(i) will return a String and the desired code will work. Writing is equivalent to writing In this case, list.get(i) returns not a String, but an Object, which simply does not have a length() method