What is the difference between an array and an ArrayList in Java?

Point	Array	ArrayList
Size	Fixed	Dynamic
Types	Primitives and objects	Objects only (use wrappers)
Length	arr.length	list.size()
Add or remove	Not possible	add(), remove()
Generics	No	Yes

import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        int[] arr = new int[3];
        List<Integer> list = new ArrayList<>();
        list.add(10);
        list.add(20);
        System.out.println(arr.length + " " + list.size());
    }
}

See Java Arrays and Java ArrayList.

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